For 1m slab width, moment, shear force, oneway continuous slab for continuous slab, moment and shear force can be obtained from table 3. The following example illustrates the design methods presented in aci 31805 and ibc 2003. Equivalent tensile stress design appendix 5examples using shrinkagecompensating concrete, p. 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. The following example illustrates the design methods presented in the article timesaving design aids for reinforced concrete, part 2. Summary and comparison of twoway slab design results. Flat slab analysis, design and detailing pdf civil engineering. Features of the geometry and details of loads applicable to the floor slab covered by this report are included herein.
Design the minimum slab thickness to support a fork lift specified below and storage racks specified below throughout. Master of science and hereby certify that, in their opinion, it is worthy of acceptance. Twoway 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 of reinforced concrete structures ii twoway slabs. Oneway and twoway slabs university of asia pacific.
Design procedure of twoway slabs using aci moment coefficients. A2slab thickness design by wri method a3design examples using coe charts a4slab design using posttensioning a5shrinkagecompensatingconcreteexamples chapter lintroduction l. Sci p300 composite slabs and beams using steel decking best. Bridge approach slab analysis and design incorporating elastic soil support presented by. Analysis and design of slabs two way civil engineers pk. Ce 437537, fall 2002 slabongrade example design info 1 8. Chapter 3 design of rectangular beams and oneway slabs. Twoway flat plate concrete floor system design structurepoint. Reinforced concrete design 1 design of slab examples and. Singly reinforced flanged section determine the area of reinforcement required in a t beam with the following dimension for an applied moment of 250 knm.
Design a thickened slab to support the columns and. Sachpazis date 18012014 chkd by date appd by 1 flat slab design to bs8110. The above spreadsheet program and users manual can be downloaded and be printed free of charge. The equivalent frame method efm presented in aci 31814 is illustrated in detail in this example to analyze and design twoway flat slab with drop panels. The dimensions of an interior bay are shown in figure 1. Accordingly, main reinforcement is required in the two directions. Oneway simply supported slab analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter. They are projections from wall face of lintel beams or floor slabs. The construction and design of concrete slabs on grade d. Fanella, which appeared in the october 2001 edition of structural engineer magazine. A2 slab thickness design by wri method a3 design examples using coe charts a4 slab design using posttensioning a5shrinkagecompensatingconcreteexamples chapter lintroduction l. For uniformly distributed loads of w per square foot of the slab, each strip acts approximately like a simple beam uniformly loaded by its share of w.
Unless otherwise noted, all referenced table, figure, and equation numbers are from these books. This pdf file contains a chapter of 23 pages with various aspects of flat slabs including four example of flat slab design. Flat plate concrete floor system does not use beams between columns or. 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. Designing a composite slab, we encounter semiempirical formulas at this step. The trial depth is selected based on spandepth ratio of 7, as in is.
Posttensioned concrete design spreadsheet program a pdh. The horizontal shear design according to ec4 offers two approaches which both necessitate serious laboratory work. Flat slab analysis, design and detailing pdf civil. The example presented here is for twoway posttensioned design. Direct design method ddm for slab systems with or without beams loaded only. Continuous one way slab figure 1 shows a clear area of 12 m x 8. Even while designing they are considered as oneslabs with cantilever fixed or continuous at supports.
Design the 4 marked slab panels of an ordinary house. This example is to be used for educational purposes only. Asce, secb course content slab on grades construction. Are the loads that are given nominal values or design values. After this publication, it was subsequently adopted by the uniform building code ubc as. Depth of slab 100 mm, width of flange 800 m, width of web 200 mm, effective depth 400 mm. Design of cantilever slab spreadsheet engineering books. Solved example a cantilever slab 200 mm thick is 1. Using aashto lrfd bridge design specifications 4th ed. Structural design of cantilever slabs solved example. The construction and design of concrete slabs on grade. The slab is designed in category a see eurocode 2, part 2, table. The design procedure separately incl udes determining thickness of slab under wall load.
Unless otherwise noted, all referenced table, figure, and equation numbers are from that article. Framing dead load selfweight superrimposed dead load 25 psf partitions, me, misc. The design procedure includes determini ng slab thickness based on moving live loads and then checking adequacy of slab thickness for stationary live load. In any span, the max cable sag, zd depends on the concrete cover requirements and the tendon dimensions. Ls equivalent static load 10 kips resistance factor 0. The recommendations derived from these and other studies vary from extremely light to extremely heavy. 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. Analysis and design of slabs one way civil engineers pk. Design of flat slab with edge beams by direct design method 16 14 14 3 b c 1 c 2 c 3 c 4 3 1 c 5 c 6 c 7 c 8 c 9 14 c 10 11.
Floor slabs can range from a simple residential basement slab to a heavyduty industrial floor. Reinforced concrete slab design and detailing guide is456. Design of reinforced concrete structures ii twoway slabs 1 1. Temperature and shrinkage reinforcement is provided along the direction perpendicular to the span. Chapter 3 design of rectangular beams and oneway slabs 12. Following are the rcc slab design and detailing guidelines. 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. Concrete floor slabs on grade are subjected to a varie ty of loads and loading conditions. The slab is supported on beams of size 225 x 500 mm spaced at 4. Introduction concrete slabs on grade are a very common type of concrete construction. Design of slab examples and tutorials by sharifah maszura syed mohsin example 2. Pdf cantilever slab design ramjan shehzaad academia.
Load transfer in a oneway slab, b twoway slab nilson fig. Ce 437537, fall 2002 slabongrade example design info 1 8 design the thickness for a slabongrade concrete slab in a warehouse. Purpose of building residential f ck 25 mpa f yk 460 mpa concrete cover 25 mm height of block wall 2. Design according to ec4 the reassuring check of composite action between profiled steel sheeting and concrete has a crucial importance. The program is divided into three separate screens, which correspond to the three major areas of concern in the design of a posttensioned member. 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. Cantilever slab design bending strength of materials. In this example deflection will be calculated and checked to satisfy project. Oneway and twoway slabs oneway slabs transfer the imposed. Bending will take place in the two directions in a dishlike form. Wheel loads can be positioned anywhere within the design traf. For example, in loadspan tables the following points should be clear. Use the aci 318 direct design method to design an interior bay of a flat plate slab system of multi bay building.
Assume partitions cannot be damaged by deflections. Tn342 design example 2way mondada 093090 adapt corporation. Oneway slabs normally design as a beam with cables running in the direction of the span at uniform centres. The design shear force can be reduced to account for the loads applied inside the outer perimeter. Slabs having supports on less than four sides can be designed as oneway. Determine the thickness of the slab panel using previous article. The following example illustrates the example building. Reinforced concrete design 1 analysis of section examples.
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