Floor slabs can range from a simple residential basement slab to a heavyduty industrial floor. Ce 479 fall 05compositefloor decks purdue engineering. If you continue browsing the site, you agree to the use of cookies on this website. Are the loads that are given nominal values or design values. Oneway simply supported slab analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter. Framing dead load selfweight superrimposed dead load 25 psf partitions, me, misc. Nagy 1 and istvan szatmari 2 technical university of budapest, department of steel structures h1521 budapest summary there is an enhanced intention imposed on building construction industry to improve time and structural efficiency of structures. One way slab design procedure with example design of one. For slabs spanning in both directions published tables and charts should be used to find bending moment and shear per unit width of slab. Lrfd design examples federal highway administration. Example composite design design composite concrete slab on steel deck floor for 125 psf live load. Reinforced concrete slab design using the empirical method. Waffle slabs are preferred for spans greater than 40 feet 12 m, as they are much stronger than flat slabs, flat slabs with drop panels, twoway slabs, oneway slabs, and. The construction and design of concrete slabs on grade d.
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 flat slab system is an important division of concrete floor system. The lateral loads are independently resisted by shear walls. Waffle slab is good against shrinkage and it is lower than stiffened rafts and footing slabs. 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. For a moment frame, the column vertical loads are the resultants of base overturning. Reinforced waffle slabs can be constructed for the span up to 16 meters while beyond that length prefabricated waffle slab is preferable. Design of staircase examples and tutorials by sharifah maszura syed mohsin example 2. Sap 2000 tutorial session notes this tutorial provides the basic steps of performing a frame analysis using sap 2000. Lrfd design example for steel girder superstructure bridge.
Aci 360, design of slabsongrade, refers to this as a type b slab. To make the superstructure continuous for live load. Waffle slab design example structural engineering general. For example, in loadspan tables the following points should be clear. Fittings typically connect the tubing between the sub slab probe and the collection container usually a summa canister. While the link slab system can provide the benefits of a continuous bridge deck, refinement of the design and detailing of the link slab itself is needed to optimize this bridge deck system and ensure longterm performance. Slabs are usually used in floor and roof construction. Design of concrete structures 14th edition, 2009, by arthur h. Bending will take place in the two directions in a dishlike fo. Equivalent tensile stress design appendix 5examples using shrinkagecompensating concrete, p. The example presented here is for twoway posttensioned design.
Designing for shear in slabs including punching shear. The following example illustrates the example building. Sci p300, composite slabs and beams using steel decking. Only the design of slab bridge will be used for illustration. A six storey building for a commercial complex has plan dimensions as shown in figure 1. Therefore, the link slab design assumes that the uhpc section is subject to bending only. Following are the rcc slab design and detailing guidelines. As it is illustrated in the following project example, the program carries each critical feature of a floor slab s geometry to the model for an authentic analysis and design. As it is illustrated in the following project example, the program carries each critical feature of a floor slabs geometry to the model for an authentic analysis and design.
A monolithic reinforced concrete floor is to be composed of rectangular bays measuring, as shown. Reinforced concrete slab design and detailing guide is456. A2 slab thickness design by wri method a3 design examples using coe charts a4 slab design using posttensioning a5shrinkagecompensatingconcreteexamples chapter lintroduction l. 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 the 4 marked slab panels of an ordinary house. 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. Please read the lauses mentioned in the video while solving the problem. Oneway and twoway slabs oneway slabs transfer the imposed.
Design the minimum slab thickness to support a fork lift specified below and storage racks specified below throughout. Chapter 3 design of rectangular beams and oneway slabs 12. Leak testing prior to collecting a sub slab sample. Jul 22, 2015 design of two way ribbed slab 18 x 25 m clear span 1. The slab is to be finished with 25 mm thick cement concrete flooring.
It was actually the widespread use of the posttensioned slabonground which induced this interest in design procedure and in many studies of reported slab failures. Western bridge preservation partnership meeting phoenix, arizona may 1214, 2020. Sap 2000 tutorial session notes mit opencourseware. The design example and commentary are intended to serve as a guide to aid bridge design engineers with the implementation. Design of two way slabs is 456 limit state method youtube. For 1m slab width, moment, shear force, oneway continuous slab for continuous slab, moment and shear force can be obtained from table 3. Pdf optimum design of reinforced concrete waffle slabs. Plan view of floor system assume partitions will not be damaged by deflections.
Design example of punching shear in slabs eurocode 2. The slab is supported on beams of size 225 x 500 mm spaced at 4. To distribute flexural stresses and strains within the uhpc over a larger area. The bearing of the slab on the supporting walls may be taken as 230 mm. The construction and design of concrete slabs on grade. Title reinforced concrete slab design using the empirical method publication no. Generally, there are two types of slab which are one way and two way slabs. This document consists of a comprehensive steel girder bridge design example, with instructional commentary based on the aashto lrfd bridge design specifications second edition, 1998, including interims for 1999 through 2002. 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. Ultimate behavior of oneway spanning slab linear elastic analysis.
Tm 580912 concrete floor slabs on grade subjected to heavy. Design of reinforced concrete structures ii twoway slabs. Twoway joist waffle slab design approach and methodology. Must watch basics of flat slab for better understanding from the link. Ce 437537, fall 2002 slabongrade example design info 1 8 design the thickness for a slabongrade concrete slab in a warehouse. Design of waffle slab without beams by direct design method 32 32 32 c 1 c 2 c 3 c 4 2 c 5 c 6 c 7 c 8 32 s ss 22 3 7 c 9 c 10 c 11 c 12 32 8 11 b 1210 bb c c 14 c 15 c 16 16. Adopt m 15 grade of concrete and mild steel reinforcement. Beams of width and depth are provided on all column lines. There are many methods that are used to analyze twoway slabs and the precision of these methods vary depending. Analysis of two way ribbed and waffle slabs with hidden beams.
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. Instructional materials complementing fema 451, design examples foundation design 1416 reduction of overturning moment nehrp recommended provisions allow base overturning moment to be reduced by 25% at the soilfoundation interface. Manual design of beam and raft foundation to eurocode 2 pdf references ubani o. Design of waffle slab without beams by direct design method 32 32 32 c 1 c 2 c 3 c 4 2 c. Fanella, which appeared in the october 2001 edition of structural engineer magazine. Two leak tests one for the sampling train and one for the sample probe should be conducted for every sub slab vapor sample in order to establish air tightness. 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. Ce 437537, fall 2002 slab ongrade example design info 1 8 design the thickness for a slab ongrade concrete slab in a warehouse. Flat slab 1 design slab rc slab design ec2 worked example bending reinforcement a short. This is supplemented by a fully worked design example for a composite beam in a 15. Design a thickened slab to support the columns and. Steelreinforced slabs, typically between 100 and 500 mm thick, are most often used to construct floors and ceilings, while thinner mud slabs. So, you can calculate, we can assume certain depth and on the basis of that, we can go for calculation or replacement. This paper deals with the problem of optimum design of reinforced concrete twoway ribbed waffle slabs using genetic algorithms.
Although not accounted for in the design, the link slab also acts as a semirigid link between spans transferring compressive, tensile, and shear stresses due to horizontal loads. Flat slab analysis, design and detailing pdf civil. Manual design of beam and raft foundation to eurocode 2. Design the slab following the provisions of the aci code. It is based on the design project example shown below, the complete solution of which is provided as a handout. Introduction concrete slabs on grade are a very common type of concrete construction. Practical structural analysis and design of residential buildings using staad pro v8i, csc orion, and manual calculations. A stepbystep design procedure is given for composite beams using various forms of precast concrete units, with or without a concrete topping. Twoway joist concrete slab floor waffle slab system. Ce 437537, fall 2002 slabongrade example design info 1 8.
Analysis and design of link slabs in jointless bridges with. In this video deisgn of two way slabs has been covered using is 456. 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. Design of slab for flexure 067 m unit width of slab. Reinforced concrete design 1 design of slab examples and. Two way slab design by direct design method as per aci 31811. Design of composite beams using precast concrete slabs. The best book to refer to is reinforced concrete design to eurocode by bill mosley. The wire reinforcing institute recommends the use of the subgrade drag theory for slabs up to 150 feet in length.
Nov 27, 20 one way slab design criteria with design example according to aci code slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. The superimposed load on the slab is to be 3500 n per square metre. Design is defined as the decisionmaking process of planning, sizing, detailing, and developing specifications preceding construction of slabs onground. Example on design of slab bridge design data and specifications superstructure consists of 10m slab, 36m box girder and 10m tgirder all simply supported. Design of reinforced concrete structures ii twoway slabs 1 1. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. It has got detailed worked example of all cocncete elements, including ribbed and waffle slabs. Continuous one way slab figure 1 shows a clear area of 12 m x 8. Bss090119991 abstract this design example illustrates the empirical design method for composite concrete bridge decks specified in article 9. Microsoft powerpoint ce 479 fall 05compositefloor decks. This manual p rescribes the criteria for the design of concrete floor slabs on grade in buildings for heavy loads and is applicable to all elements responsible for military construction. Using aashto lrfd bridge design specifications 4th ed. Optimum design of reinforced concrete waffle slabs alaa c. Notes author staff bridgesight software sponsor bridgesight software.
The following example illustrates the design methods presented in the article timesaving design aids for reinforced concrete, part 2. Waffle slab analysis and design is similar to the procedure used with flat plates except that special considerations need. Download file pdf flat slab manual design bs flat slab manual design bs flat slab design example part 1 how to design a flat slab, step by step explained in this video. Bending will take place in the two directions in a dishlike form. How to design concrete structures using eurocode 2.
This paper focuses on analysis of twoway ribbed and waffle slabs with hidden beams. Analysis and design of slabs two way civil engineers pk. Lecture series on design of reinforced concrete structures by prof. A concrete slab is a common structural element of modern buildings, consisting of a flat, horizontal surface made of cast concrete. The recommendations derived from these and other studies vary from extremely light to extremely heavy. Unless otherwise noted, all referenced table, figure, and equation numbers are from these books. Reinforced concrete, 2014, 9th edition, aci 31811 code edition, by jack c. The following example illustrates the design methods presented in the pca book simplified design reinforced concrete buildings of moderate size and height third edition. Civil engineering design 1 analysis and design of slabs 20067 dr. Heavy loads in building s such as warehouses include moving load s, stationary live loads, and wall loads. The steel deck will be used on 86 3continuous spans. Unless otherwise noted, all referenced table, figure, and equation. Reinforced concrete design 1 design of slab examples. Information on other aspects, su ch as materials, construction methods, placement of concrete, and finishing techniques, is.
A civil engineer must know all the aspects regarding the flat floor system. A waffle slab or twoway joist slab is a concrete slab made of reinforced concrete with concrete ribs running in two directions on its underside. L1084 32 abingdon villas page 35 of 70 pringuerjames consulting engineers ltd. Sep 03, 2011 reinforced concrete sk 33 section through slab showing stress due to moment. Unless otherwise noted, all referenced table, figure, and equation numbers are from that article. The building is located in seismic zone iii on a site with medium soil. Design criteria for concrete slab in composite steel deck floors section 5. This gives you complete waffle slab design with rebar detailing and schedules. To make the slab design independent of the type of rail, we will place the wheel load 1 from the nominal face of the rail 1ft from the edge of the slab. The following example illustrates the design methods presented in aci 31805 and ibc 2003.
According to the way loads are transferred to supporting beams and columns, slabs are classified into two types. Twoway joist waffle slab design approach and methodology twoway joist slab often called twoway ribbed slab or waffle slab is an economical floor system when the spans are long andor loads are high. 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. Oneway and twoway slabs oneway slabs transfer the imposed loads in one direction only. They may be supported on two opposite sides only fig. For the flat slab with the general arrangement as shown below, let us design the punching shear for column b1 given the following design information. Find the following parameters for design moments in step 2 per unit width step 4 note. Nhi course 081 load resistance factor design lrfd for highway bridge superstructures, design examples pdf, 7. 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. Dhang, department of civil engineering, iit kharagpur. Oneway and twoway slabs university of asia pacific.
Waffle slab requires only 70% of concrete and 80 % of steel from the concrete and steel used for stiffened raft. Waffle slab or ribbed slab construction procedure and. Asce, secb course content slab on grades construction. The name waffle comes from the grid pattern created by the reinforcing ribs.