The output of the program for the slab in the example is shown in the following pages. Slabs and flat slabs lecture 5 19 th october 2016 contents lecture 5 designing for shear in slabs including punching shear detailing solid slabs flat slab design includes flexure worked example exercise punching shear. Deflection calculations from nilson and nawy the deflection of a uniformly loaded flat plate, flat slab, or twoway slab supported by beams on column lines can be calculated by an equivalent frame method that corresponds with the method for moment analysis. Twoway slab analysis and design using equivalent frame method efm.
Use the download button below or simple online reader. The following example illustrates the design methods presented in the pca book simplified design reinforced concrete buildings of moderate size and height third edition. A civil engineer must know all the aspects regarding the flat floor system. A reinforced concrete slab is built integrally with its supports and consists of equal span of 15 ft. Design of reinforced concrete structure one way slab presented by md. This condition occur when the slabs are connected monolithically with support. Frame analysis also provides a convenient way for generating input for this program. 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 crosssectional dimensions 18 in. Structural design for residential construction cynthia chabot, p. Design examples look at example 7 design of a flat plate floor without spandrel beams direct design method look at example 9 design of a two way slab with beams in both directions. The behaviour of reinforced concrete beam sections at ultimate loads has been explained in. Design of a two way slabs for punching shear resistance.
Slab design reading assignment chapter 9 of text and, chapter of aci31802. One way and twoway slabs one way slabs transfer the imposed loads in one direction only. Introcduction slab in which the deflected surface is predominantly cylindrical termed as one way slabs spanning in the direction of curvature. Fatal parking garage collapse at the tropicana casino resort. Lets take an example the below twoway slab diagram. In this article, it is assumed that slab thickness is determine but calculation of. The design of composite slabs and beams is discussed in detail in relation to the eurocodes and bs 5950. Distribute moments transverse at critical sections to column and middlestrip and if. Slabs are usually used in floor and roof construction. How to design a twoway slab free download as powerpoint presentation.
The 2012 edition of the reinforced concrete design manual sp1711 was developed in accordance with the design provisions of aci 31811, and is consistent with the format of sp1709. For example, it is possible to decrease the amount of reinforcement at one section if a corresponding increase is introduced at another section. In the design of structures, the aim is to design the structure in such a way that it fulfils its intended purpose during its intended life time and be adequately. Twoway slab deflection calculation serviceability comparison of twoway slab analysis and design methods. Mar 10, 2018 design steps for rcc one way slab by prof. The slab may be supported by walls, by reinforced concrete beams usually cast monolithically with the slab, by s. Summary of bill of quantities civil works bar bending schedule. The pca computer program pcaslab can be used to expedite the design of different slab systems. Ce 433, fall 2006 slab design example 1 6 design a oneway slab for an exterior bay of a multistory office building using the information specified below. The building is located in seismic zone iii on a site with medium soil. Reinforced concrete slab design and detailing guidelines for depth of slab, loads on slab, reinforcement guide for oneway and twoway slabs as per is 456. Introcduction slab in which the deflected surface is predominantly cylindrical termed as oneway slabs spanning in the direction of curvature. Reinforced concrete design to bs8110 structural design 1 lesson 5 5 4. The following example illustrates the example building.
Load calculations page 1 of 6 load calculations according to asce 7. There are several methods by which two way slabs can be designed. Oneway and twoway slabs oneway slabs transfer the imposed loads in one direction only. Design of slab two way excel sheet design spreadsheets the specified design strength of the concrete, is 25 mpa and the specified yield strength of the reinforcement, fy, is 400 mpa. Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3. In addition to general ultimate and serviceability limit state design issues, practical design considerations such as the formation of holes in the slab, support details, fire protection, and attachments to the slab are discussed. 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. The file extension pdf and ranks to the documents category. Direct design method of flat plates per aci 31802 twoway slabs are inherently difficult to analyze by conventional methods of statics because of the twoway bending occurring. A monolithic reinforced concrete floor is to be composed of rectangular bays measuring, as shown. When you model a building structure, you can use the design links function to select a series if beam elements and export the analysis results geometry together with the bending moment and shear force envelopes to continuous beamslab design. Twoway restrained slab if the slabs consist more than one panel or corner of the slab are prevent against lifting it is define as twoway restrained slab. Design of one way and two way slabs, design of staircases. Strength design or ultimatestrength design usd strength design or ultimatestrength design usd with strength design method, the working dead load dl and live load ll are.
Following are the rcc slab design and detailing guidelines. Unless otherwise noted, all referenced table, figure, and equation. The direct design method of analysing a twoway slab is not recommended for prestressed. Manual for the design of reinforced concrete building. Where the slab acts compositely with a beam, or is used as a diaphragm.
Two types of shear failure mechanism in 2way slabs. Flat slab system is an important division of concrete floor system. The design follows the pti ibc, ubc recommendations, with enhancements where necessary epti. They may be supported on two opposite sides only fig. Twoway concrete floor slab with beams design and detailing csa. One way spanning slabs should be treated as beams of unit width and chapter 2 should be followed except for minimum shear reinforcement. Shear failure occurs when inclined cracks form due to flexural and shearing stresses. Pdf analysis of two way ribbed and waffle slabs with.
Mass and volume are the two types of batching for measuring cement, sand, coarse aggregates, admixtures and water. How to design a two way slab free download as powerpoint presentation. Accurately determining the moments on a two way slab is typically accomplished by finite element computer analysis. The slab has to carry a distributed permanent action of 1. Design of one way reinforced concrete slabs class notes and example notes on. Design of reinforced concrete components of a house.
However, it should be known that the coefficient method is still applied for twoway slabs. Reinforced concrete design to bs8110 structural design 1. Direct design method of flat plates per aci 31802 two way slabs are inherently difficult to analyze by conventional methods of statics because of the two way bending occurring. Aci 31811 code provides two methods for two way slab design one of which is. Two way slab design by direct design method as per aci 31811, step by step procedure and limitations of direct design method for two way slab is presented. Design of twoway slab by coefficient method the constructor. Design of reinforced concrete structures ii two way slabs 1 1. The following example illustrates the design methods presented in aci 31805 and ibc 2003.
Slabs are constructed to provide flat surfaces, usually horizontal, in building floors, roofs, bridges, and other types of structures. Twoway slab design using the coefficient method free download as pdf file. The joint was considered as a slabcolumn joint and analyzed, in the eastwest direction, on the premise that the slab acted as a two way slab near the column. Jul 10, 2017 this example goes through the design of a simplysupported oneway slab on beams. Minimum uniformly distributed live loads for building design. Use the aci 318 direct design method to design an interior bay of a flat plate slab system of multi bay building. Generally, there are two types of slab which are one way and two way slabs. The institution of structural engineers the institution of civil engineers march 2000 manual for the design of reinforced concrete building structures to ec2. The example presented here is for twoway posttensioned design. The purpose of this document is to summarise the way that aluminium profile. The design bending moment of twoway restrained slab can be calculated as follows. Reinforced concrete slab design and detailing guide is456. One way slab design procedure with example design of one.
Now calculate bar bending schedule for two way slab. Twoway edge supported ribbed slabs design methods in the aci code 31808, two empirical methods are given for analysis and design of twoway slabs, regardless of their types. According to the way loads are transferred to supporting beams and columns, slabs are classified into two types. Design of slab examples and tutorials by sharifah maszura syed mohsin example 1. Twoway flat plate concrete floor system design structurepoint.
Reinforced concrete design 1 design of slab examples. The basic design procedure of a twoway slab system has five steps. Example design of two way edgesupported solid slab. Two way slab design by direct design method as per aci 31811. The service live load is 100 psf and 4000 psi concrete is specified for use with steel with a yield stress equal to 60000 psi. Here, we have tried to gather various reading materials available in the web about flat slab floor system in one place. Reinforced concrete design 1 design of slab examples and. Two way flat plate concrete floor system analysis and design the concrete floor slab system shown below is for an intermediate floor to be designed considering partition weight 20 psf, and unfactored live load 40 psf. Design examples look at example 7 design of a flat plate floor without spandrel beams direct design method look at example 9 design of a twoway slab with beams in both directions. Look at example 7 design of a flat plate floor without spandrel beams direct design method look at example 9 design of a twoway slab with beams in both directions. I am submitting it to you and i want students or professional engineers to download it and use it for their studies or projects.
The two classifications are oneway slab and twoway slab. Jul 08, 2015 slabs are constructed to provide flat surfaces, usually horizontal, in building floors, roofs, bridges, and other types of structures. A six storey building for a commercial complex has plan dimensions as shown in figure 1. Design procedure steps for one way slab slab design steps. It shows possible solutions of two way prestressed floors depending on different factors. Flat slab analysis, design and detailing pdf civil engineering. Plan view of floor system assume partitions will not be damaged by deflections. Before going to this topic, please read it there are two types of slab classification based on the direction of bending occurs in these slabs. Layout of posttensioning reinforcement in floor slabs by dr. Chapter 3 design of rectangular beams and oneway slabs 12. Reinforced concrete design to bs8110 structural design 1 lesson 5 1 lesson 5. Twoway concrete slab with beams spanning between supports.
Oneway and twoway slabs university of asia pacific. In case of one ways slabs, the aci approximate analysis is applicable to one way slab system where a one way slab is continuous with a one way slab. Analysis and design of slabs two way civil engineers pk. Determine moments at critical sections in each direction, normally the negative moments at supports and positive moment near midspan.
This is to simplify the calculation of moment of inertia of the section. Hidden or drop beams can be used with this system depending on their spans. Pdf the paper presents the cost optimization of reinforced concrete simply supported oneway slabs under uniformly distributed load with the nonlinear. One way and two way slabs one way slabs transfer the imposed loads in one direction only. In this example deflection will be calculated and checked to satisfy project deflection. The dimensions of an interior bay are shown in figure 1. Design the slab following the provisions of the aci code.
Framing dead load selfweight superrimposed dead load 25 psf partitions, me, misc. In lieu of detailed calculation for deflections, csa a23. Jul 22, 2015 design of two way ribbed slab 18 x 25 m clear span 1. Flat slab analysis, design and detailing pdf civil. There are many methods that are used to analyze two way slabs and the precision of these methods vary depending. Rectangular beams and one way slabs page 2 of 9 two methods. Contains all design checks required by the american concrete institute code and all the conditions that must be met during the design process. Pdf the article is about design of prestressed slabs.
Shear strength of twoway slabs shear failure occurs when inclined. Accurately determining the moments on a twoway slab is typically accomplished by finite element computer analysis. For those who do not know what are the des ign requirements of a slab. Determine suitable dimensions for the effective depth and width of the beam. Slab resting on walls or sufficiently deep and rigid beams on all sides. Step 2 design forces draw panel of slab and indicate maximum design moments, shears and in plane loads, if any, per unit width of slab. Twoway slab design equivalent frame method efm moment distribution column stripbeam. Design of a two way rcc slab structural engineering forum. Multistorey residential building 111 appendix c floor design using lattice slab 115 c. Design of abutment excel sheet there is document design of abutment excel sheet available here for reading and downloading. However, it should be known that the coefficient method is still applied for two way slabs. Beams of width and depth are provided on all column lines. Pdf cost optimum design of reinforced concrete simply. Flat slab analysis, design and detailing pdf flat slab system is an important division of concrete floor system.
Tn342 design example 2way mondada 093090 adapt corporation. Shear strength of two way slabs shear failure occurs when inclined cracks form due to flexural and shearing stresses. The first aa solution is a twoway concrete solid slab with depth3 h 18 cm supported by 0,25. Twoway slab design using the coefficient method beam. The beam could be considered a thickened slab at the end because a large number of longitudinal rebars of the beam were not and could not be placed through the confines of the column. This paper focuses on analysis of two way ribbed and waffle slabs with hidden beams.
A g j way meng, ceng, mice t c cosgrove bsc, msc, dic, miei, ceng, mistructe. The program covers wide range of two way slab systems and can be used for more complex slab layouts. Design of reinforced concrete structures ii twoway slabs. The example presented here is for two way posttensioned design. The basic design procedure of a two way slab system has five steps. Bending will take place in the two directions in a dishlike fo.
Flat plate concrete floor system does not use beams between columns or. Bending will take place in the two directions in a dishlike form. Allowable stress design or working stress design wsd 2. Analysis and design of slabs two way two way edge supported slabs two way slabs. All methods are viable provided that the safety and serviceability of the elements are within the acceptable limits. Here are the steps for the design procedure for one way slab in steps. Design of reinforced concrete structures ii twoway slabs 1 1. Determine moments at critical sections in each direction, normally the negative. Unless otherwise noted, all referenced table, figure, and equation numbers are from these books. Two way slabs have two way bending unlike one way slab.
European commission joint research centre institute for the protection and security of the citizen contact information address. Design of slabtwo way excel sheet online civilforum. Summary and comparison of twoway slab design results. This example is to be used for educational purposes only.
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