A2slab thickness design by wri method a3design examples using coe charts a4slab design using posttensioning a5shrinkagecompensatingconcreteexamples chapter lintroduction l. Find depth of slab using deflection control criteria. Flat slab system is an important division of concrete floor system. Oneway and twoway slabs oneway slabs transfer the imposed. Design of one way slabs as per is 456 worked step by step. Twoway slab analysis and design using elastic frame method efm efm as known as equivalent frame method in the aci 318 is the most comprehensive and detailed procedure provided by the csa a23. The procedure of the design of oneway slab is the same as that of beams. In any span, the max cable sag, zd depends on the concrete cover requirements and the tendon dimensions. Design procedure of twoway slabs using aci moment coefficients. Design procedure steps for one way slab slab design steps.
Oneway slabs normally design as a beam with cables running in the direction of the span at uniform centres. The main objective of this project is to analyze and design a multistory building 3ddimensional reinforce concrete frame, the design of reinforced concrete slabs, beams, columns, footings and. Determine the thickness of the slab panel using previous article. The two classifications are oneway slab and twoway slab. Manual for design and detailing of reinforced concrete to the september 20 code of practice for structural use of concrete 20 2. The integral wearing surface is considered in the weight calculations. Manual for design and detailing of reinforced concrete to the. Example design combinations for deflection quasipermanent derived for. Step 3 shear envelope max sk 210 typical shear envelope of. Here, we have tried to gather various reading materials available in the web about flat slab floor system in one place. Chapter 3 design of rectangular beams and oneway slabs 12. There must be at least 3 continuous spans in each direction viz column strip, middle strip, column strip the panels should be rectangular and the ratio of longer.
The construction and design of concrete slabs on grade. Information on other aspects, su ch as materials, construction methods, placement of concrete, and finishing techniques, is. Design of slab examples and tutorials by sharifah maszura syed mohsin. Basic procedure of structural design the structural world.
Reinforced concrete design 1 design of slab examples. Distribute moments transverse at critical sections to. It is recommended that for culverts with spans over 3. Before going to this topic, please read it there are two types of slab. Reinforced concrete slab design using the empirical method bridgesight solutions for the aashto lrfd bridge design specifications bridgesight software tm creators of effective and reliable solutions for the worlds bridge engineers 2688 venado way rescue, ca 95672 phone. The intent of this handbook is to provide a design procedure which could be used in. For this reason, some supplemental design guidance is provided when practical and technically justified. Chapter 3 design of rectangular beams and oneway slabs. Manual for design and detailing of reinforced concrete to. Draw maximumminimum ultimate load bending moment envelope after redistribution. Reinforced concrete slab design and detailing guidelines for depth of slab, loads on slab, reinforcement guide for oneway and twoway. Design of slab examples and tutorials by sharifah maszura syed mohsin example 1.
However, even interior climate controlled spaces can experience temperature ranges of 40 o to 60 of. The author of this engineering bulletin is robert g. Design of reinforced concrete structures ii twoway slabs 1 1. When zd is determined, the prestressing force required to balance an. Asce, secb course content slab on grades construction. For those who do not know what are the des ign requirements of a slab. One way slab design how to design one way slab daily civil. Calculation of approximate depth from deflection criteria cl 23. What are the design requirements of concrete slab design. What should be the design procedure for designing a flat.
After this publication, it was subsequently adopted by the uniform building. Chapter 18 concrete slab structures january 2019 188 18. These materials are originally located at different websites. Slabs are usually used in floor and roof construction. Carry out analysis step 2 moment envelope sk 29 typical moment envelope of a continuous beam. Determine moments at critical sections in each direction, normally the negative moments at supports and positive moment near midspan. There are two types of slab classification based on the direction of bending occurs in these slabs. The following limitations apply to the slab system.
Twoway joist concrete slab floor waffle slab system. It is used where the supporting soil has low bearing capacity. We are goings to learn what are design requirements of concrete slab design as per standard is codes. Mat or raft foundation is a large concrete slab supporting several columns in two or more rows. The second alternate procedure for determining reinforcement is the computation of the percent.
How to design a flat slab, step by step explained in this video. Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3. Design of masonry short and long walls, columns and retaining walls. Twoway joist concrete slab floor waffle slab system analysis and design design the concrete floor slab system shown below for an intermediate floor with partition weight of 50 psf, and unfactored live load of 100 psf. Flat slab analysis, design and detailing pdf civil engineering. Select representative 1 m wide design stripstrips to span in the short direction, as shown in figure 8.
Introduction concrete slabs on grade are a very common type of concrete construction. The bearing capacity increased by combining all individual footings in to one mat since bearing capacity is proportional to width and depth of foundations. At ground floor, slabs are not provided and the floor will directly rest on ground. Blast design procedure for flat slab structures dtic. Must watch basics of flat slab for better understanding from the link given below. Figure 1 illustration of sub slab probe design components of the subslab probe.
Step 2 design forces draw panel of slab and indicate maximum design moments, shears and in. Distribute moments transverse at critical sections to column and middlestrip and if. In general, the design of slab become more simpler because compression reinforcement are often not required and the shear stress are usually low except when there are heavy concentrated load. M ed is that part of the unbalanced slab bending moments that is transferred into the column at the support. A slab strip of unit width is analysed using simple beam theory. Thus, the maximum reinforcement ratio corresponds to a net tensile strain in the.
Flat slab analysis, design and detailing pdf civil. Design of reinforced concrete structures ii twoway slabs. The lateral loads are independently resisted by shear walls. Twoway flat plate concrete floor system design structurepoint. Following are the rcc slab design and detailing guidelines.
The construction and design of concrete slabs on grade d. Reinforced concrete slab design using the empirical method. Analysis and design of continuous slab and beam footing ubani obinna u. The slab has to carry a distributed permanent action of 1. Design is defined as the decisionmaking process of planning, sizing, detailing, and developing specifications preceding construction of slabs onground. Bending will take place in the two directions in a dishlike form. Here are the steps for the design procedure for one way slab in steps. Oneway spanning slabs should be treated as beams of unit width and chapter 2 should be followed except for minimum shear reinforcement. A design procedure for carrying out detail design of slab may be list out as follows. Reinforced concrete slab design and detailing guide is456. Dec 14, 2017 design of one way slab is covered in this video.
Pdf design procedure of column footings foundation design. Design step 4 design of deck prestressed concrete bridge design example task order dtfh6102t63032 43 for this example, a slab thickness of 8 in. Oneway solid slabs are designed as rectangular sections subjected to shear and moment. Chapter 3 design of rectangular beams and oneway slabs 12 h a 12 strip in a simply supported one way sl ab h. According to the way loads are transferred to supporting beams and columns, slabs are classified into two types. The design procedure set forth in that publication had at that time been in use by the author for about 15 years. Rectangular beams and oneway slabs page 5 of 9 maximum permissible steel ratio, max an overreinforced beam will fail in a brittle manner while an underreinforced beam will. Twoway concrete floor slab with beams design and detailing. A procedure for carrying out the detailed design of slabs is shown in table 1. A flat slab is a reinforced concrete slab supported directly by concrete columns without the. Design procedure the basic design procedure of a twoway slab system has five steps. A civil engineer must know all the aspects regarding the flat floor system.
Calculate aspect ratio aspect ratio 2 longer spanshorter span 2. Assume partitions cannot be damaged by deflections. Design of one way slabs as per is 456 worked step by. Design of rectangular beams and oneway slabs continued. Use i wsd, ii usd to design the twoway slab shown below, carrying floor finish 30 psf, random wall 50 psf and live load 60 psf given. Therefore, only ground beams passing through columns are provided as tie beams.
Concrete design procedures generally follow the strength design method contained in aci318, although certain aspects of the procedures may be considered conservative relative to conventional residential foundation applications. How to design concrete structures using eurocode 2. Both methods use the same procedure to divide the moments so found between the middle strip and column strips of the slab and the beams if any. The concrete floor slab system shown below is for an intermediate floor to be designed. A combination of these values will determine the slab stresses at the time of stressing and at service loads. A2 slab thickness design by wri method a3 design examples using coe charts a4 slab design using posttensioning a5shrinkagecompensatingconcreteexamples chapter lintroduction l. The bearing capacity increased by combining all individual footings in to one mat since bearing capacity. Therefore, the objective of this report was to develop and document the procedures for designing flat slab structures. Accordingly, main reinforcement is required in the two directions. The results of the study show that the slab can be successfully used for residential buildings as it meets all the requirements and demands fewer materials. Pdf 3 analysis and design of deck slab satya narayana.
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