# Two Way Slab Design Example Pdf

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* Concrete Slabs Design Example - Free download as PDF File (. The unit weight of reinforced concrete is assumed to be 24 kN/m3. Reinforcement implementation, static and dynamic analysis For reasons regarding behaviour, safety and economical design, the two-way slab is far more efficient than the equivalent one-way slab. 75 Kn/m Bending Moment B. RCC Dog-legged Staircase design Excel Sheet. 5 Kn/m Wall load = 2 Kn/m Live load = 2 Kn/m Total U. Two-Way Slab Design Based on ACI 318-11 using Finite Element Method. One way concrete slab bends or deflects in a direction perpendicular to the supporting. 101,234 at University of Duhok. In this paper the cost optimization of reinforced concrete two-way slabs under uniformly distributed load with the nonlinear programming approach has been presented and it is a continuation of the. 2, two-way slabs are designed based on "column strips" and "middle strips". β1 cannot be less than 0. TN404_slab_shear_050611 SHEAR DESIGN IN FLOOR SLABS1 Bijan O Aalami2 1 - ONE-WAY AND TWO-WAY SHEAR Tests have shown that concrete exhibits greater resistance to shear, when the geometry of its support is square, and of about the same dimensions as slab thickness Fig. D = 130 mm d = 105 mm Loads on slab Self weight of slab = 3. In two-way slabs shorter direction strip carry greater %age of load. I would really appreciate it if somebody would post a link or a document that showcases an example of a complete waffle slab (two-way joist slab) design. , interior beam dimensions = 14 in. (6), the maximum value of moment coefficient for four different support conditions (simply-supported, continuous at one end and simply-supported at the other, continuous at. For those who do not know what are the des ign requirements of a slab. Basic Steps in Two-way Slab Design Choose layout and type of slab. 0 m centers. Tests on three model slabs incorporating minimum reinforcement ratio, minimum depth and maximum bar spacing permitted by the Australian Concrete Structures Code showed satisfactory behaviour at service loads and ultimate loads despite the fact that bending. Latifee Question: Define the term slab, one way slab, two way slab, Shrinkage and temperature reinforcement, main reinforcement. Member/Location. Depending on the boundary condition and the properties of the slabs, methods of finding bending moment is expressed in the BS 8110 Part 01 as follows. Given: 20' 20 a I 0 c b w = 1. 3 Limit States Design Method 18. 0, slab is called two-way slab, as shown in the fig. 85 for f c’ ≤ 4,000 psi, and decreases by 0. 2—Deflection analysis. Apr 25, 2020 - PPT - Design of Two way Slab Civil Engineering (CE) Notes | EduRev is made by best teachers of Civil Engineering (CE). Static analysis of two-way slabs, subjected to uniform load, is performed using tables, which give the fundamental support moments, span moments and shear forces. However, plastic method can be the best method for designing such cases of two-way slabs. Allowable stress design or working stress design (WSD) 2. 1(1) Crack Control of Slabs Part 1: AS 3600 Design 7. Two-Way Restrained Slab • If the slabs consist more than one panel or corner of the slab are prevent against lifting it is define as two-way restrained slab. by EF Date 20/08/2014 Chk'd by EF Date App'd by Date RC SLAB DESIGN (BS8110:PART1:1997) TEDDS calculation version 1. 375 kn-m Ultimate Moment Mu = 1. Slabs may be classified into 2 types depending on ratio of larger side to shorter side, its recommended in IS 456 to design slabs having (ly/lx) ratio greater than 2 as one way slab and slabs having (ly/lx) less than 2 as two way slab. Inroduction When the ratio (L/S) is less than 2. In order to simplify the analysis and to be able to use the superposition principle for evaluating the effect of load combinations, linear analysis is generally adopted even though concrete slabs normally have a pronounced non-linear response. It can be used by both practicing Engineers and students. 9m -Beam is designed as rectangular section of b=0. Excel Sheet to Design Slab - One Way and Two Way > Share: Rate: Previous Computational Methods for Fluid Dynamics by Ferziger. Two-way Slabs Prestressing Tendons (CGS) At top = 48 mm At bottom = 48 mm Nonprestressing reinforcement (cover) At top = 25 mm At bottom = 25 mm 143 DESIGN CRITERIA 143. For the example building, the storey numbers are defined as follows:. Two Way Slab Problem Statement: Use the ACI 318 Direct Design Method to design an interior bay of a flat plate slab system of multi bay building. The load on the slab is carried by the short span in one direction. Concrete cover to slab = 25mm. 2—Deflection analysis. However, two-way slabs with bonded tendons are widely used in other parts of the world—notably, Asia, Europe, and Australia. Part Two is an example-intensive course, with key concepts introduced along the way. When one says ribbed slab it is actually a one way spanning system with ribs where as in waffle slab the joists form a two -way system. flat slabs and pad foundations Shear There are three approaches to designing for shear: • When shear reinforcement is notrequired e. 2 Beams Rectangular beams, inverted L-beams, T-beams 44 3. Civil Engineering Design (1) 11 Dr. Plan View of Floor System Assume partitions will not be damaged by deflections. So, for the first try use wire mesh that is the closest to 0. 375 kn-m Ultimate Moment Mu = 1. Round slab thickness up to the nearest ¼”. Both vertical and horizontal loads may be transferred from one member to another properly (if the beams and slabs are designed succesfully). What to expect from this course: After completion of this course, you are expected to be able to design the two types of RC Beams: Joist Slab System, and Solid Slab System. Shorter direction steel will be placed near the outer edge to get more “d” means more lever arm to get more flexural capacity. Download: BS 8110 CONCRETE DESIGN FOR SLAB. 0 International " Version History Cite this work. 27 Design Example 1 (Typical House with 2 Rooms and Verandah). The numbering of the members is explained as below. Direct design method is used for the structural analysi s and. Two-way Slabs Prestressing Tendons (CGS) At top = 48 mm At bottom = 48 mm Nonprestressing reinforcement (cover) At top = 25 mm At bottom = 25 mm 143 DESIGN CRITERIA 143. Reinforced concrete structures II - Two way slab Example Reinforced concrete structures II Page 1 Example 3. Generally, there are two types of slab which are one way and two way slabs. e Longer span (l)/Shorter span (b) < 2. • This condition occur when the slabs are connected monolithically with support. Two way RCC slab designing tool in Microsoft excel developed by Shankar Tayal a 3rd year student of school of infrastructure, Indian Institute of Technology, Bhubaneswar. Methods of analysis of two-way slabs 3. Inroduction When the ratio (L/S) is less than 2. Linear supports: a) column-beam support a) b) b) column-wide beam (dropped slab strip) support Point-like supports of flat slabs c) d) c) column (without column head) d) column with fungiform column head. Slabs with beams a. Before going to this topic, Please read it. Guideline design for concrete slab. Two Way Slab Problem Statement: Use the ACI 318 Direct Design Method to design an interior bay of a flat plate slab system of multi bay building. CE 403, Fall 2015 Slab Design Example 1 / 5 (ACI 318‐11 Referenced) Design a one‐way slab for an interior bay of a multi‐story office building using the information specified below. BRIDGE APPROACH SLAB ANALYSIS AND DESIGN INCORPORATING ELASTIC SOIL SUPPORT _____ A Thesis presented to. 03 TWO WAY SPANNING SLAB DEFINITION - RESTRAINED; Overall depth of slab; h = 250 mm Outer sagging steel. Part Two is an example-intensive course, with key concepts introduced along the way. One-way slabs (for m=l l /l s >2) b. For the example building, the storey numbers are defined as follows:. 7 12 A Tributary u ft2 V q 0. Rooms (two way slabs) are continuous with verandah (one way slab). So, main reinforcement is provided in both direction for two way slabs. Example Problems For Concentrated Loads Example 1: Point Load This problem is designed to demonstrate how to check the ability of a composite slab to carry a 3000 lb point load over an area of 4. 9 provides A. 2 Beams Rectangular beams, inverted L-beams, T-beams 44 3. A system where a two way slab is continuous with a one way slab or vice versa is called a mixed slab system. One way slabs are such slabs in which the loads are shared only by the shorter direction of the slab. Two-Way Slab Design Based on ACI 318-11 using Finite Element Method. The basic design procedure of a two-way slab system has five steps. As the support geometry. Step 2 Design forces Draw panel of slab and indicate maximum design moments, shears and in-. In this example, the calculating value of the effective depth d v is equal to the effective depth d minus the concrete cover c on the bottom surface of the slab: , 204 30 174 vout. Bending will take place in the two directions in a dish-like form. 00, is considered to be two-way. 9—Post-tensioned slabs. 6 for the design of one-way slabs except that the bending moments and shear forces are determined by different methods for the two types of slab. Distribute moments transverse at critical sections to column and middle-strip and if. , and unfactored live load = 100 psf. system reported herein is small, since the one-way system is small. A slab is supported four direction however to taken the ratio b/w length to breadth than the ratio is greater than or equal two ( ly/lx >2) the slab is designed as one way slab. BASIC STEPS OF TWO WAY SLAB DESIGN : 1. β1 cannot be less than 0. 7 12 A Tributary u ft2 V q 0. 1(a)], in which the structural action is essentially one-way, the loads being carried in direction perpendicular to the supporting beams or walls. Design of Slab(Two Way) Excel Sheet. A reinforced concrete slab is built integrally with its supports and consists of two equal spans, each with a clear span of 15 ft. Before going to this topic, Please read it. Design Example of a Building IITK-GSDMA-EQ26-V3. 54 Russell Road, London Job Ref. If the proportion of longer dimension of the slab panel to the shorter dimension is more than or equivalent to 2 then it is defined as one way slab. 1 Introduction A slab is structural element whose thickness is small compared to its own length and width. Widths to used for design and calculations are : -For the remained slab of column strip: b = 1. In above figure (a) represents one way slab. Two-way concrete slabs with openings the static system and the design of reinforcement. TN404_slab_shear_050611 SHEAR DESIGN IN FLOOR SLABS1 Bijan O Aalami2 1 - ONE-WAY AND TWO-WAY SHEAR Tests have shown that concrete exhibits greater resistance to shear, when the geometry of its support is square, and of about the same dimensions as slab thickness Fig. Cornell University, David Darwin (University of Kansas), Charles Dolan (University of Wyoming) 3. Download Free DEMO Updated August 8, 2019 SoilStructure Slab on Grade Software simplifies the calculation of a […]. 5 Building Plan Assume S = (32 + x/2) , Building spans = (S, S, S) by (S, S, S) Design of Waffle Slab. Two-way slabs (for m=l l /l s <2) The most common solution for slab systems. One way spanning slabs. Accordingly, main reinforcement is required in the two directions. OF TWO-WAY SLABS BY GERALD C. A2-Slab thickness design by WRI method A3-Design examples using COE charts A4-Slab design using post-tensioning A5-Shrinkage-compensatingconcreteexamples CHAPTER l-INTRODUCTION l. The example presented here is for Two-Way Post-Tensioned Design. face of the column as for flat plates, plates. Check List for Block / Brick work. Punching Shear Reinforcement on Slab 39 One Way Joist 41 Two-Way Slab Analyzed by the Direct Design Method 47 Development Length of Bars in Tension 50 Group of Headed Studs in Tension Near an Edge 52 Shear Strength of Slab at Column Support 54 Simple Span Deep Beam by Strut-and-Tie Model 56 Continuous Deep Beam by Strut-and-Tie Model 60. Inroduction When the ratio (L/S) is less than 2. Tests on three model slabs incorporating minimum reinforcement ratio, minimum depth and maximum bar spacing permitted by the Australian Concrete Structures Code showed satisfactory behaviour at service loads and ultimate loads despite the fact that bending. input cells automatically cross out invalid data 3. The 2012 edition of the Reinforced Concrete Design Manual [SP-17(11)] was developed in accordance with the design provisions of ACI 318-11, and is consistent with the format of SP-17(09). Reinforced Concrete Buildings Series Design Booklet RCB-2. Two-Way Flat Plate Concrete Floor System Analysis and Design. Two way slabs are the slabs that are supported on four sides and the ratio of longer span (l) to shorter span (b) is less than 2. Sachpazis Date 18/01/2014 Chk'd by Date App'd by 1 FLAT SLAB DESIGN TO BS8110:PART 1:1997 Slab geometry Span of slab in x-direction; Span x = 7200 mm Span of slab in y-direction; Span y = 7200 mm. In this video deisgn of two way slabs has been covered using IS 456. determine the preliminary slab thickness h documents similar to post_tensioned_sample. As the support geometry. m BB 8 l M wl 22 12 A-A 2 1 kN-m, kN. The method of Marcus 4. 13 and the Elastic Frame Method presented in this chapter. 1 Two Way slab design 1. For the example building, the storey numbers are defined as follows:. The example presented here is for Two-Way Post-Tensioned Design. 7 12 A Tributary u ft2 V q 0. Two Way Slab: Two way slab is supported by beams on all the four sides and the loads are carried by the supports along both directions, it is known as two way slab. 5 m for a hall construction in a school. 3 STEP-BY-STEP DESIGN PROCEDURE FOR SLABS Step 1 Analysis Carry out analysis (follow Section 3. Both vertical and horizontal loads may be transferred from one member to another properly (if the beams and slabs are designed succesfully). Accordingly, main reinforcement is required in the two directions. 7 Two-Way (Waffle) Flat Slab Design plications will be illustrated in the design examples following. 1 allows other methods if they meet certain requirements. In this paper the cost optimization of reinforced concrete two-way slabs under uniformly distributed load with the nonlinear programming approach has been presented and it is a continuation of the. Design Example of a Building IITK-GSDMA-EQ26-V3. • In any span, the max cable sag, zd depends on the concrete cover requirements and the tendon dimensions. The Coefficient Method is a method of designing two-way slabs that are supported by edge beams. BS 8110: Part 1: 1997) - Shear Force for Two-way Restrained Slab and Actions on Supporting Beams. This is known as lifting of corner. Inroduction When the ratio (L/S) is less than 2. 101,234 at University of Duhok. I am submitting it to you and i want students or professional engineers to download it and use it for their studies or projects. They may be supported on two opposite sides only [Fig. 9 m q = 20 kN/m g = 15 kN/mk k From the table of Span/d for initial sizing Span d d Span mm. The interior column has a section of 20" x 20" & carries dead & live load of 220 kips & 120 kips respectively. The following example illustrates the design methods presented in ACI 318-05 and IBC 2003. Part Two is an example-intensive course, with key concepts introduced along the way. Two way slab design by direct design method as per ACI 318-11, step by step procedure and limitations of direct design method for two way slab is presented. Design Procedure for One Way Slab. Design Example of a Building IITK-GSDMA-EQ26-V3. Fig(2- ): Slabs supported at two edges or three. 27 Design Example 1 (Typical House with 2 Rooms and Verandah). 7 Two-Way (Waffle) Flat Slab Design plications will be illustrated in the design examples following. pdf - Free download Ebook, Handbook, Textbook, User Guide PDF files on the internet quickly and easily. Please read the lauses mentioned in the video while solving the problem. Here are the steps for the Design Procedure for One Way Slab in steps. usually one and two-way. Design of Waffle Slab (without beams) by Direct Design Method 32 32 32 C 1 C 2 C 3 C 4 132 C 5 C 6 C 7 C 8 32 (S (S(S 22 3 7 C 9 C 10 C 11 C 12 32 8 11 B 1210 BB C 13 C 14 C 15 C 16 16. The integral wearing surface is considered in the weight calculations. The following example illustrates the design methods presented in the PCA book "Simplified Design-Reinforced Concrete Buildings of Moderate Size and Height" third edition. For those who do not know what are the des ign requirements of a slab. Slabs having supports on less than four sides can be designed as one-way. CE 403, Fall 2015 Slab Design Example 1 / 5 (ACI 318‐11 Referenced) Design a one‐way slab for an interior bay of a multi‐story office building using the information specified below. 05 for every 1,000 psi above 4,000 psi. Static analysis of two-way slabs, subjected to uniform load, is performed using tables, which give the fundamental support moments, span moments and shear forces. 3 Non prestressed two-way construction - 9. ONE WAY SLAB here i solve a probleam based on the one way slab, the diamentions are provided in the probleam 1st determine the aspect ration and with respect to the aspect ratio the type of slab. 1 and rating requirements as stated in 17. It can be used by both practicing Engineers and students. DESIGN OF FLAT SLABS. Assume partitions cannot be damaged by deflections. TN404_slab_shear_050611 SHEAR DESIGN IN FLOOR SLABS1 Bijan O Aalami2 1 - ONE-WAY AND TWO-WAY SHEAR Tests have shown that concrete exhibits greater resistance to shear, when the geometry of its support is square, and of about the same dimensions as slab thickness Fig. 25 Kn/m Floor finish = 2 Kn/m Filling load = 3. 3 in2, respectively as shown on the next page figure. Minimum Depth of 2-Way Slab for Deflection Control. two-way reinforced concrete slab example. The ratio of the total costs was found to be within the range (1. Therefore slab is two way. CE 433, Fall 2006 Slab Design Example 1 / 6 Design a one-way slab for an exterior bay of a multi-story office building using the information specified below. : is the clear distance in the short direction in the panel. 25 MPa fy = 300 MPa Analysis and Design of Slabs Two Way. RCC Slab Design depends on the on the dimensions of the slab after which the slab is termed as a one-way slab or a two-way slab… In the design of RCC structures, Column Design and Beam Design are to be done before we start with RCC Slab Design… Basic Rules followed in the design of simply supported Slab. The following example illustrates the design methods presented in ACI 318-05 and IBC 2003. Two-Way Concrete Floor Slab with Beams Design and Detailing Design the slab system shown in Figure 1 for an intermediate floor where the story height = 12 ft, column cross-sectional dimensions = 18 in. In flat-plate floors, slab-column connections are subjected to high shear stresses produced by the transfer of axial loads and bending moments between slab and columns. Its scope includes proposing the inclusion of two new equations: to compute effective moment of inertia by Bischoff (2005) and Bischoff and Scanlon (2007) and to calculate minimum thickness required for a two-way slab by Scanlon and Choi (1999) respectively. This effect is neglected as a safe estimate. 0 m centers. Example Load Distribution Problem 7 The floor system of a library consists of a 6-in thick rein-forced concrete slab resting on four floor steel beams, which in turn are supported by two steel girders. ft-k 8 2 2 1 l wlM 86. Inroduction When the ratio (L/S) is less than 2. Here are the steps for the Design Procedure for One Way Slab in steps. Slab Reinforcement. In two-way slabs shorter direction strip carry greater %age of load. Bending will take place in the two directions in a dish-like form. The situations in which the reinforced concrete slabs require the intervention for repairs or strengthening are the following [1]: a) Repairing damaged/deteriorated concrete slabs to restore their strength and stiffness. The interior column has a section of 20" x 20" & carries dead & live load of 220 kips & 120 kips respectively. Accurately determining the moments on a two-way slab is typically accomplished by finite element computer analysis. Example (Design of two-way edge-supported solid slab): A monolithic reinforced concrete floor is to be composed of rectangular bays measuring , as shown. ASCE, SECB COURSE CONTENT Slab on Grades Construction: Introduction Concrete slabs on grade are a very common type of concrete construction. 1_452 the professional development series is a unique oppor- analysis and design of post-tensioned, two-way slabs for example, an 8-inch-thick slab is typical for a. Two-Way Restrained Slab • If the slabs consist more than one panel or corner of the slab are prevent against lifting it is define as two-way restrained slab. Moment CoefficientMethod for two way slabs Direct DesignMethod for two way slabs Analysis and Design of Slabs Department of Civil Engineering, University of Engineering and Technology Peshawar, Pakistan Prof. OF TWO-WAY SLABS BY GERALD C. Design Of Reinforced Concrete Structures ii Two-Way Slabs 1 1. Apr 25, 2020 - PPT - Design of Two way Slab Civil Engineering (CE) Notes | EduRev is made by best teachers of Civil Engineering (CE). They may be supported on two opposite sides only [Fig. One-way and Two-way Slabs One-way slabs transfer the imposed loads in one direction only. 5 it behaves as one-way slab. Thanks in advance. pdf), Text File (. In this example, the calculating value of the effective depth d v is equal to the effective depth d minus the concrete cover c on the bottom surface of the slab: , 204 30 174 vout. Two-Way Concrete Floor Slab with Beams Design and Detailing Design the slab system shown in Figure 1 for an intermediate floor where the story height = 12 ft, column cross-sectional dimensions = 18 in. Slabs may be classified into 2 types depending on ratio of larger side to shorter side, its recommended in IS 456 to design slabs having (ly/lx) ratio greater than 2 as one way slab and slabs having (ly/lx) less than 2 as two way slab. The mesh designated 6 x 6 - W2. Two Way Slab: Two way slab is supported by beams on all the four sides and the loads are carried by the supports along both directions, it is known as two way slab. Static analysis of two-way slabs, subjected to uniform load, is performed using tables, which give the fundamental support moments, span moments and shear forces. 5 kN/m^2 (100 mm thick slab) Live load on slab : 3 kN/m^2 Total load. Beams of width and depth are provided on all column lines; thus the clear-span dimensions for the two-way slab panels are. 6 for the design of one-way slabs except that the bending moments and shear forces are determined by different methods for the two types of slab. Main features of the spreadsheet 1. The coefficient method may be the simplest, easiest and the quickest approach for the design of two-way slab supported by edge beam on all slab sides. Chapter 3: Analysis and Design of Two-way Slabs Page 1 CHAPTER 3. is adequate for one-way shear. OPTIMUM COST DESIGN OF REINFORCED CONCRETE SLABS USING « 543 continuous slab that depends on the type of slab supports. The load on the slab is carried by the short span in one direction. A single slab with two-way reinforcement rebars will be analyzed with RCsolver. One way spanning slabs. They may be supported on two opposite sides only [Fig. While there is a dearth of published research available describing the behavior of two-way slabs with bonded tendons, the author has received. This is a part of his project 'Economic design of two way RCC slabs' under Prof S. This is because it's length to width ratio is (Long/Short) not big enough for loads to travel in the short direction onl. Application of the yield line theory for more complex situations 8. 20 TWO-WAY SLABS Service (final) stresses Tension stress as multiple of (f'c)^1/2. A reinforced concrete slab is built integrally with its supports and consists of two equal spans, each with a clear span of 15 ft. 0, slab is called two-way slab, as shown in the fig. Loads: Framing Dead Load = selfweight Superrimposed Dead Load = 25 psf partitions, M/E, misc. 1 Design and Rating Requirements All new concrete slab structures are to meet design requirements as stated in 17. , edge beam dimensions = 14 in. 5 Building Plan Assume S = (32 + x/2) , Building spans = (S, S, S) by (S, S, S) Design of Waffle Slab. 8—Slab shear reinforcement. middle strips, similar to those used in conventionally reinforced two-way slabs. Flat slab Two-way slab with beams 4. nice user-friendly interface 2. PT Designer is a computer program for the design and analysis of linear post-tensioned concrete floor systems. The edge column on the left has a section of 16" x 16" and carries dead & live load of 175 kips & 110 kips respectively. Notes Author Staff - BridgeSight Software Sponsor BridgeSight Software. 3 review question. In two way slab, the ratio of longer span (l. Concrete Mix Design Excel Sheet. Loads: Framing Dead Load = selfweight Superrimposed Dead Load = 25 psf partitions, M/E, misc. Reinforced Concrete Design to BS8110 Structural Design 1 - Lesson 5 5 4. Comparison of One-way and Two-way slab behavior One-way slabs carry load in one direction. 2: Behavior of Two way slab Since, the slab rest freely on all sides, due to transverse load the corners tend to curl up and lift up. Two-Way Restrained Slab • If the slabs consist more than one panel or corner of the slab are prevent against lifting it is define as two-way restrained slab. 27 Design Example 1 (Typical House with 2 Rooms and Verandah). When a slab is supported on all four sides and the ratio of long span to short span is equal or greater than two, it will be considered as one way slab. Load Paths, One and Two Way Slabs | Structural Concepts and Design - Duration: 10:34. However main reinforcement bar and distribution bar. , interior beam dimensions = 14 in. 7 Two-Way (Waffle) Flat Slab Design plications will be illustrated in the design examples following. for other hand the length to breadth ratio is then two the slab is designed as two way slab (ly/lx <2 ). (3) All Slab Design examples have been updated to report the slab design forces rather than the strip forces. Unless otherwise. 2 m) each direction Resists lateral loads by frame action Can have capitals, drop panels, beams & joist Efficient, least depth & material use 1 8 - 3 0 f t Flat Plates (Two‐Way) Two‐way Slabs 39 40. Refer to Fig. 1 Introduction A slab is structural element whose thickness is small compared to its own length and width. txt) or read online for free. 3 STEP-BY-STEP DESIGN PROCEDURE FOR SLABS Step 1 Analysis Carry out analysis (follow Section 3. nice user-friendly interface 2. This is because it's length to width ratio is (Long/Short) not big enough for loads to travel in the short direction onl. Part Three is an example-intensive course, with key concepts introduced Fundamentals of Post-Tensioned Concrete Design for Buildings - Part One. The first Reinforced Concrete Design Manual (formerly titled ACI Design Handbook) was developed in accordance with the design provisions of 1963 ACI 318 Building Code by ACI Committee 340, Design. 0 Page 6 provided at 100 mm below ground level. When a slab is supported on all four sides and the ratio of long span to short span is equal or greater than two, it will be considered as one way slab. Notes on One Way Slab Design -Dr. Generally, there are two types of slab which are one way and two way slabs. Two-Way Restrained Slab • If the slabs consist more than one panel or corner of the slab are prevent against lifting it is define as two-way restrained slab. A Two-Way Slab "TWS" is simply a slab carrying loads in both directions (length and width) to its supports (Beams or Columns). Design Of Two Way Slab Example Pdf. Concrete cover to slab = 25mm. This Report is intended to serve as a manual of good practice for the design of prestressed concrete flat slabs. In addition to the recommended procedures, other methods are described for the sake of completeness and to compare different methods of design. A system where a two way slab is continuous with a one way slab or vice versa is called a mixed slab system. Design example: a simple two-way post-tensioned plate for. For those who do not know what are the des ign requirements of a slab. Design of Two-Way Floor Slab System Comparison of One-way and Two-way slab behavior One-way slabs carry load. Chajjas and verandahs are an practical example of one way slab. CE 433, Fall 2006 Slab Design Example 1 / 6 Design a one-way slab for an exterior bay of a multi-story office building using the information specified below. 5 kN/m^2 (100 mm thick slab) Live load on slab : 3 kN/m^2 Total load. 4 Summary of a Design Example with Soft Soil detailing to provide enhanced local two-way action, providing increased flexural. 8 CHAPTER 8: DESIGN OF ONE-WAY SLABS 8. Slab thickness of 7 in. Direct design method is used for the structural analysi s and. 3 STEP-BY-STEP DESIGN PROCEDURE FOR SLABS Step 1 Analysis Carry out analysis (follow Section 3. Can be used for larger spans with relatively higher cost and higher deflections One-way joist system suitable span 6 to 9m with LL= 4-6KN/m2. In two way slab, the ratio of longer span (l. This method was provided in the American Concrete Institute (ACI) in 1963 to design two-way slabs carried by steel beams, deep beam, or walls. Existing Two-Way Slab Design Procedures The Example Structure • • • • A Preliminary Girder Design • • • • • Structure Details • • • • • • • Specified Loadings A One-Way Design. According to the way loads are transferred to supporting beams and columns, slabs are classified into two types; one-way and two-way. DESIGN OF FLAT SLABS. TIME SAVING DESIGN AIDS Two-Way Slabs Page 1 of 14 The following example illustrates the design methods presented in the article “Timesaving Design Aids for Reinforced Concrete, Part 2: Two-way Slabs,” by David A. floodproofing, and construction of a floodwall in a residential setting. Beams, see Lecture 3 • Punching shear requirements e. "direct design method" of the present code, has led many engineers to continue to use the design method of the 1963 ACI Code for the special case of two-way slabs supported on four sides of each slab panel by relatively deep, stiff, edge beams. Step 2 Design forces Draw panel of slab and indicate maximum design moments, shears and in-. 75 Kn/m Bending Moment B. This system consist of both one way and two way slabs. This appendix presents design examples of the retrofitting techniques for elevation, dry floodproofing, wet. to have a minimal length. Punching Shear Reinforcement on Slab 39 One Way Joist 41 Two-Way Slab Analyzed by the Direct Design Method 47 Development Length of Bars in Tension 50 Group of Headed Studs in Tension Near an Edge 52 Shear Strength of Slab at Column Support 54 Simple Span Deep Beam by Strut-and-Tie Model 56 Continuous Deep Beam by Strut-and-Tie Model 60. Determination of bending moment and shear force. Part Two is an example-intensive course, with key concepts introduced along the way. 10—Bonded reinforcement in post-tensioned slabs. Unless otherwise noted, all referenced table, figure, and equation numbers are from these books. 3 presents two parallel methods for calculating moments in two-way slab systems. A reinforced concrete slab is built integrally with its supports and consists of two equal spans, each with a clear span of 15 ft. This PDF file contains a chapter of 23 pages with various aspects of flat slabs including four example of flat slab design. 2: Behavior of Two way slab. Two-way slabs carry load in two directions. In two way slabs, load will be carried in both the directions. Part Two of the course was example-intensive, and key concepts were introduced along the way. The numbering of the members is explained as below. Two-way slabs (for m=l l /l s <2) The most common solution for slab systems. One-way Slabs • Normally design as a beam with cables running in the direction of the span at uniform centres. Two-way slabs (for m=l l /l s <2) The most common solution for slab systems. 1 Two Way Slab Problem Statement: Use the ACI 318 Direct Design Method to design an interior bay of a flat plate slab system of multi bay building. The load on the slab is carried by the short span in one direction. "direct design method" of the present code, has led many engineers to continue to use the design method of the 1963 ACI Code for the special case of two-way slabs supported on four sides of each slab panel by relatively deep, stiff, edge beams. Flat slabs are two-way slabs supported by point-like supports. FOREWORD The Reinforced Concrete Design Manual [SP-17(11)] is intended to provide guidance and assistance to professionals engaged in the design of cast-in-place reinforced concrete structures. 0, slab is called two-way slab, as shown in the fig. Fanella, which appeared in the October 2001 edition of Structural Engineer magazine. The unit weight of reinforced concrete is assumed to be 24 kN/m3. 2, two-way slabs are designed based on "column strips" and "middle strips". An optimal plan geometry with all same supports is a square, based on load distribution into both directions. 375 kn-m Ultimate Moment Mu = 1. Flat Slab Design [PDF Document]. Determine moments at critical sections in each direction, normally the negative moments at supports and positive moment near mid-span. A system where a two way slab is continuous with a one way slab or vice versa is called a mixed slab system. Beams, see Lecture 3 • Punching shear requirements e. A reinforced concrete slab is built integrally with its supports and consists of two equal spans, each with a clear span of 15 ft. , edge beam dimensions = 14 in. For the example building, the storey numbers are defined as follows:. 101,234 at University of Duhok. flat slabs. Allowable stress design or working stress design (WSD) 2. 5m Variable load 4kN/mm2 Slab thickness 175mm Fck 25N/mm2 fyk 500N/mm2 Cover to the reinforcements 25mm Office building Slab loading. Fundamentals of Post-Tensioned Concrete Design for Buildings - Part One covers related topics such as punching shear for two-way slabs and moment transfer at the column. Part Three is an example-intensive course, with key concepts introduced Fundamentals of Post-Tensioned Concrete Design for Buildings - Part One. In order to simplify the analysis and to be able to use the superposition principle for evaluating the effect of load combinations, linear analysis is generally adopted even though concrete slabs normally have a pronounced non-linear response. Thanks in advance. Effective depth d= Span /((L/d)Basic x modification factor) For obtaining modification factor, the percentage of steel for slab can be assumed from 0. Main features of the spreadsheet 1. 0 k-ft 0' N CEE 461: Reinforced Concrete Design, slide 7. flat slabs and pad foundations Shear There are three approaches to designing for shear: • When shear reinforcement is notrequired e. 5 m for a hall construction in a school. Matthew Stuart, P. The waffle slab is also sometimes termed as ribbed slab system but you would find it interesting to know that ribbed and waffle slab are somehow two different things. This is a part of his project 'Economic design of two way RCC slabs' under Prof S. , and unfactored live load = 100 psf. 13: Bending moment coefficient for simply supported two-way slab (Ref. Design the two way slab beam supported floor system if it is intended to be used for office building ,assume the partition wall load to be 2 ⁄ I2 Use C25/30 S400 Cover 25 mm Solution. Civil Engineering Design (1) 11 Dr. Accordingly, main reinforcement is required in the two directions. automatic generation of a step by step design calculation. Distribute moments transverse at critical sections to column and middle-strip and if. In above figure (a) represents one way slab. Two-Way Concrete Floor Slab with Beams Design and Detailing. The design of waffle slabs is the same as that of ribbed slabs, with the difference being that waffle slabs have ribs spanning in both directions, and the coefficients used for analysing the slab is similar to those used for two-way restrained slab. 5 Kn/m Wall load = 2 Kn/m Live load = 2 Kn/m Total U. The Dimensions of an interior bay are shown in Figure 1. Part Two is an example-intensive course, with key concepts introduced along the way. Matthew Stuart, P. 1—Minimum slab thickness. Here ratio of longer span of slab to the shorter span of slab is greater than 2. Main reinforcement(rft) is provided in one direction for one-way slabs. Complete Analysis & Design of a Slab on Grade Structure - Analyses uniform thickness finite Slab on Grade with free ends, supported by a vertical subgrade modulus and subjected to a Wall Load, Point Load and Uniform Pressure. Fanella, which appeared in the October 2001 edition of Structural Engineer magazine. CHAPTER 6—SERVICEABILITY CONSIDERATION. Plan View of Floor System Assume partitions will not be damaged by deflections. 7 12 A Tributary u ft2 V q 0. Section 11. Slab design is comparatively easy when compared with the design of other elements. Section Civil & Geotechnical Engineering 1 Calc. hmin = (inner perimeter of slab panel)/180 ≥ 90 mm. Computer analysis of two-way slab. There are two types of slab classification based on the direction of bending occurs in these slabs. 61m -For half middle strip: b= 3. • A slab strip of unit width is analysed using simple beam theory. RC Slab Design EC2 - Worked example - Bending reinforcement - Duration: 14:57. However main reinforcement bar and distribution bar. Latifee Question: Define the term slab, one way slab, two way slab, Shrinkage and temperature reinforcement, main reinforcement. This example is to be used for educational purposes only. b) Corrosion of the reinforcement. This system consist of both one way and two way slabs. Two edge supported slab is always one-way. The load on the slab is carried by the short span in one direction. Download Free DEMO Updated August 8, 2019 SoilStructure Slab on Grade Software simplifies the calculation of a […]. Slabs are primarily categorized as either one way or two ways. Previously known as Method 3 of the 1963 ACI Code. Design of two way slabs(d. What to expect from this course: After completion of this course, you are expected to be able to design the two types of RC Beams: Joist Slab System, and Solid Slab System. The design shear force can be reduced to account for the loads applied inside the outer perimeter. In this article, I will discuss how to design One way slab with example. 2 Design Data. • CHAPTER 5. two-way slabs built in the United States is extremely rare. Have enthusiasm in writing for the professional exam like FE, PE. Flexural Deflection in ACI 318-02 Controlled in Section 9. Chapter 18 – Concrete Slab Structures January 2019 18-8 18. 1 allows other methods if they meet certain requirements. The slabs having supports on all sides acts as two way. automatic generation of a step by step design calculation. middle strips, similar to those used in conventionally reinforced two-way slabs. The integral wearing surface is considered in the weight calculations. Download Free DEMO Updated August 8, 2019 SoilStructure Slab on Grade Software simplifies the calculation of a […]. 5 m for a hall construction in a school. The Dimensions of an interior bay are shown in Figure 1. , interior beam dimensions = 14 in. To see their result for this slab we will find the load factor, λ, to cause failure. pdf), Text File (. The execution of the design will be explained with reference to an example. input cells automatically cross out invalid data 3. It can be used by both practicing Engineers and students. text was added to each chapter, while maintaining relevant design aids and illustrative examples. Download Two way Slab Design Excel Sheet Template. View Design of two-way slabs(D. FOREWORD The Reinforced Concrete Design Manual [SP-17(11)] is intended to provide guidance and assistance to professionals engaged in the design of cast-in-place reinforced concrete structures. Chapter 3: Analysis and Design of Two-way Slabs Page 1 CHAPTER 3. A reinforced concrete slab is a broad, flat plate, usually horizontal, with top and bottom surfaces parallel or nearly so. Check List for Block / Brick work. However, plastic method can be the best method for designing such cases of two-way slabs. txt) or view presentation slides online. flat slabs. 2: Behavior of Two way slab. The PDF covers the following topics: Properties of flat slab. and Design of Residential Slabs-on-Ground, BRAB Report #33. 3 review question. Material: C30. 0, slab is called two-way slab, as shown in the fig. Part Two is an example-intensive course, with key concepts introduced along the way. A passionate reader and writer. The waffle slab is also sometimes termed as ribbed slab system but you would find it interesting to know that ribbed and waffle slab are somehow two different things. * the design moments in the edge panel may have to be adjusted according to 3. If the proportion of longer dimension of the slab panel to the shorter dimension is more than or equivalent to 2 then it is defined as one way slab. Examples C1 through C5 are a set of examples that illustrate the elevation of a single-story home with a crawlspace. This section will explain how the direct design method is used. all milld steel reinforcement shall conform to astma-15-62-2t for reinforcing bars 12 ; 280. Two-way Slab Design using the Coefficient Method - Free download as PDF File (. 5 Kn/m Wall load = 2 Kn/m Live load = 2 Kn/m Total U. Design the slab, following the provisions of the ACK Code. The spreadsheet takes user input values for the slab design parameters such as dimensions and concrete strength, and inputs for the design moments and shear forces. One way spanning slabs. 05 for every 1,000 psi above 4,000 psi. Design Procedure for One Way Slab. The program is developed around the robust computational core of two popular programs - PTData. Main features of the spreadsheet 1. Main reinforcement(rft) is provided in one direction for one-way slabs. These slabs are constructed to provide flat surfaces, usually horizontal, in building floors, roofs or other types of structures. Reinforced Concrete Buildings Series Design Booklet RCB-2. The mesh designated 6 x 6 - W2. , edge beam dimensions = 14 in. pdf), Text File (. For flat plates and slabs the column connections can vary between: 5. Storey number Storey numbers are given to the portion of the building between two successive grids of beams. In two way slabs, load will be carried in both the directions. The execution of the design will be explained with reference to an example. Two-Way Flat Plate Concrete Floor System Analysis and Design. Concrete slabs are commonly divided into the following types: • Beamless slabs Beamless slabs are supported only on columns and are applied mostly in large industrial and public buildings. Chapter 18 - Concrete Slab Structures January 2019 18-8 18. Design of Two-Way Floor Slab System Comparison of One-way and Two-way slab behavior One-way slabs carry load. They may be supported on two opposite sides only [Fig. Allowable stress design or working stress design (WSD) 2. In two way slab, the ratio of longer span (l) to shorter span (b) is less than 2. The program is developed around the robust computational core of two popular programs – PTData. Check List for Block / Brick work. The load on the slab is carried by the short span in one direction. A detailed explanation will be given of the checksto be carried out, the aspects to be considered in the design and the construction procedures and sequences of a post-tensioned slab. Direct design method, that could have been named the direct analysis method because it determines or prescribes moments for different parts of the slab panel without the need to conduct structural analysis, is explained in the following sections. 6 Design the distribution steel: The As (in the transverse direction) must be equal to or greater than 0. For a two way slab the ratio of ly/lx shall be ≤ 2. ; A Middle strip is a design strip bounded by two column. xlsm Member Design - RC Two Way Spanning Slab 03-09-15 CONSULTING E N G I N E E R S All Beams Beam y Sag Beam y Hog Beam x Sag Beam x Hog Made by Date Chd. 75 2 (18 14) ( ) 248. This effect is neglected as a safe estimate. Strength Design or Ultimate-strength design (USD) Strength Design or Ultimate-strength design (USD) With strength design method, the working dead load (DL) and live load (LL) are. pdf), Text File (. two-way reinforced concrete slab example. 101,234 at University of Duhok. Two case studies are discussed; the first is a waffle slab with solid heads, and the second is a waffle slab with band beams along column centerlines. Determine moments at critical sections in each direction, normally the negative moments at supports and positive moment near mid-span. • CHAPTER 5. Daily work report Excel Sheet. A reinforced concrete slab is a broad, flat plate, usually horizontal, with top and bottom surfaces parallel or nearly so. Determine suitable dimensions for the effective depth and width of the beam. Slab shear strength - two-way shear Check the adequacy of slab thickness for punching shear (two-way shear) at an interior column (Figure 4): Tributary area for two-way shear is 16 5. 2, two-way slabs are designed based on "column strips" and "middle strips". 3 Example 2 - Rectangular Two-Way Slab Designed to AS 3600-2000 Using 500PLUS design Slabs, Slabs,. Design a rectangular combined footing to support two columns shown above. 7 Two-Way (Waffle) Flat Slab Design plications will be illustrated in the design examples following. That is, the load factor at. The method of Marcus 4. pdf from CIVIL ENG. The example presented here is for Two-Way Post-Tensioned Design. The values of G are given in Table 1. nice user-friendly interface 2. 3 Limit States Design Method 18. The Coefficient Method is a method of designing two-way slabs that are supported by edge beams. D = 130 mm d = 105 mm Loads on slab Self weight of slab = 3. Slab design is comparatively easy when compared with the design of other elements. One-way slabs:. Design Step 4 - Design of Deck Prestressed Concrete Bridge Design Example Task Order DTFH61-02-T-63032 4-3 For this example, a slab thickness of 8 in. BRIDGE APPROACH SLAB ANALYSIS AND DESIGN INCORPORATING ELASTIC SOIL SUPPORT _____ A Thesis presented to. Design of two way slabs(d. One way concrete slab bends or deflects in a direction perpendicular to the supporting. In this paper the cost optimization of reinforced concrete two-way slabs under uniformly distributed load with the nonlinear programming approach has been presented and it is a continuation of the. 00075tc(12), where tc is the concrete cover. The edge column on the left has a section of 16" x 16" and carries dead & live load of 175 kips & 110 kips respectively. Two-way Slab Design using the Coefficient Method - Free download as PDF File (. According to the way loads are transferred to supporting beams and columns, slabs are classified into two types; one-way and two-way. 2, two-way slabs are designed based on "column strips" and "middle strips". One way spanning slabs. In two way slab, the ratio of longer span (l) to shorter span (b) is less than 2. Two Way Slab Problem Statement: Use the ACI 318 Direct Design Method to design an interior bay of a flat plate slab system of multi bay building. Title Reinforced Concrete Slab Design Using The Empirical Method Publication No. Dutta , IIT Bhubaneswar. Fanella, which appeared in the October 2001 edition of Structural Engineer magazine. Reinforced concrete structures II - Two way slab Example Reinforced concrete structures II Page 1 Example 3. Slabs may be classified into 2 types depending on ratio of larger side to shorter side, its recommended in IS 456 to design slabs having (ly/lx) ratio greater than 2 as one way slab and slabs having (ly/lx) less than 2 as two way slab. Example Problems For Concentrated Loads Example 1: Point Load This problem is designed to demonstrate how to check the ability of a composite slab to carry a 3000 lb point load over an area of 4. There are two types of slab classification based on the direction of bending occurs in these slabs. Floor slabs can range from a simple residential basement slab to a heavy-duty industrial floor. two-way slabs built in the United States is extremely rare. 1-3 for further clarification of other terms. 4 All prestressed concrete construction - 9. 1 Two Way Slab Problem Statement: Use the ACI 318 Direct Design Method to design an interior bay of a flat plate slab system of multi bay building. Constitution D J LeeCBE BScTech DIC FEng FIStructE FICE Chairman, (until April 1995) (previously G Maunsell & Partners) R S Narayanan BE(Hons) MSc DIC FEng FIStructE Chairman, (from May 1995) (S B Tietz & Partners) ProfessorAWBeebyBSc(Eng) PhD CEng MIStructE MICE (University of Leeds) PG CobbCEng MICE (Sir Robert McAlpine & Sons Ltd). 2—Deflection analysis. The basic design procedure of a two-way slab system has five steps. These are the Direct Design Method presented in Chap. 1—Minimum slab thickness. Part Two is an example-intensive course, with key concepts introduced along the way. shown on pages 42 and 43 of our Design Manual and Catalog of Steel Deck Products. Strength Design or Ultimate-strength design (USD) Strength Design or Ultimate-strength design (USD) With strength design method, the working dead load (DL) and live load (LL) are. Guideline design for concrete slab. 30 min) 24 dia. While the example is related to a specific system type (two-way slab) the workflow applies to input of one-way slabs and beams. Design of Two-Way Floor Slab System Comparison of One-way and Two-way slab behavior One-way slabs carry load. 8—Slab shear reinforcement. Two-Way Concrete Floor Slab with Beams Design and Detailing. 25 Kn/m Floor finish = 2 Kn/m Filling load = 3. Latifee Question: Define the term slab, one way slab, two way slab, Shrinkage and temperature reinforcement, main reinforcement. Slab design Example 02 Design of simply supported slab (Two way spanning) =1. Others Types of slabs Figure: Grid or Waffle slab One way slab Two way slab. They may be supported on two opposite sides only [Fig. The slab looses the contact over some region. Load Paths, One and Two Way Slabs | Structural Concepts and Design - Duration: 10:34. 8 CHAPTER 8: DESIGN OF ONE-WAY SLABS 8. Cantilever Slab Design Calculation & Procedure Design of cantilever slab to Eurocode 2 Span of slab 1. However, because the continuous two-way tendons had to be placed in a draped parabolic profile -near the top of the slab at the column lines, and near the bottom of the slab at midspan - the cables had to be placed in a basket weave pattern. Type of slab is strongly affected by architectural and construction considerations. Deep ribs, the concrete and steel quantities are relative low Expensive formwork expected. The one-way slabs are presented in Section 9. 1(a)], in which the structural action is essentially one-way, the loads being carried in direction perpendicular to the supporting beams or walls. Storey number Storey numbers are given to the portion of the building between two successive grids of beams. Two way slab 1. I have found several links online but they almost all explain how to figure out the dimensions with little mention of the reinforcement. system reported herein is small, since the one-way system is small. Two-Way Restrained Slab • If the slabs consist more than one panel or corner of the slab are prevent against lifting it is define as two-way restrained slab. In two way slab, the ratio of longer span (l) to shorter span (b) is less than 2. Comparison of One-way and Two-way slab behavior One-way slabs carry load in one direction. Concrete slabs are commonly divided into the following types: • Beamless slabs Beamless slabs are supported only on columns and are applied mostly in large industrial and public buildings. Concrete Slab Design - Two Way Slab Direct Design Method. ACI 318 provides two alternative methods for designing two-way slabs for concrete, The equivalent frame method? (EFM) and the direct design method (DDM). Economic Concrete Frame Elements to Eurocode 2 Pictorial index ii Symbols iv 1 Introduction 1 2 Using the charts and data 2 3 In-situ concrete construction 24 3. Types of Slabs: 1. usually one and two-way spanning slabs • Punching shear -e. 2 Example 1: Ultimate Behavior of One-Way Spanning Slab Linear Elastic Analysis Methods such as moment distribution are linear elastic methods. 3m at ve moments and as T. c) Limiting crack width under increased (design/service) loads or sus-tained loads. If the ratio of longer dimension of the slab panel to the shorter dimension is greater than or equal to 2 then it is designed as one way slab. Two Way Slab. the Faculty of the Graduate School 3. The example presented here is for Two-Way Post-Tensioned Design. input cells automatically cross out invalid data 3. If the proportion of longer dimension of the slab panel to the shorter dimension is more than or equivalent to 2 then it is defined as one way slab. Part Two of the course was example-intensive, and key concepts were introduced along the way. system reported herein is small, since the one-way system is small. However, because the continuous two-way tendons had to be placed in a draped parabolic profile -near the top of the slab at the column lines, and near the bottom of the slab at midspan - the cables had to be placed in a basket weave pattern. Distribute moments transverse at critical sections to column and middle-strip and if. The slabs having supports on all sides acts as two way. 5 kN/m^2 (100 mm thick slab) Live load on slab : 3 kN/m^2 Total load. There are many methods that are used to analyze two-way slabs and the precision of these methods vary depending. The direct design method. 13: Bending moment coefficient for simply supported two-way slab (Ref. *
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