In both of them, the shear resistance has to be determined by means of slab tests, however the total number of test can be considerably reduced, because once the longitudinal strength. Mccabe1 the enclosed example is presented to demonstrate the intent and use of the aisi tentative recommendations for the design of composite steel deck slabs, and hereafter will be referred to as the criteria. The composite slab which has to be placed on a conference hall has been selected for this project. No attempt is made to finish the rebar design for required lengths or the number of bars to be carried continuously as this is concrete design.
The method is based on the lower bound theorem of plasticity, meaning that a design based on the strip method is always safe. Interior bay dimensions 20 24 this example is to be used for educational purposes only. Following are the rcc slab design and detailing guidelines. Concrete floor slabs on grade are subjected to a varie ty of loads and loading conditions. Examples of engineered lumber include wood ijoists, trusses, and solid rectangular. Composite slab worked example 1 made by sssr date 140500 structural steel design project calculation sheet checked by pu date 080800 check the adequacy of the continuous composite profiled deck slab with spans of 3. Application and use of this information requires design by a registered professional structural engineer. Enhancement due to the effect of inplane forces on the bending capacity. The slab has to carry a distributed permanent action of 1. C 5 is the slope correction coefficient co is the consolidation correction coefficient as an example. The design steps for a posttensioned composite bridge girder were prepared with the help of several sample design calculation demonstrated. This help file describes input and analysis features of slab bridge designer 2. For 1m slab width, moment, shear force, oneway continuous slab for continuous slab, moment and shear force can be obtained from table 3.
The simple strip method is used to design edge supported slabs. This course provides the documentation to enable the use of a posttension design spreadsheet program for oneway concrete beam and slab and twoway concrete slab systems. Design example on composite steel deck floor slabs by thomas j. 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. The design of composite slabs and beams is discussed in detail in relation to the eurocodes and bs 5950. Reinforced concrete design s u r a n a r e e institute of engineering university of technology school of civil engineering design of slabs. The construction and design of concrete slabs on grade. 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 c c 12 c c 14 c 15 c 16 8 c 17 c 18 c 19 c 20 8. Program scope, design assumptions, design methodology, program limitations, description of inputoutput, hardware requirements.
Flat slab analysis, design and detailing pdf civil engineering. The strip method is usually divided into tow parts. Use the aci 318 direct design method to design an interior bay of a flat plate slab system of multi bay building. Reinforced concrete design 1 design of slab examples. In this project, the design of composite slab and connection with the beam using shear connectors have been done using insdag design manual based on assumptions of eurocode4 and is.
Sachpazis date 18012014 chkd by date appd by 1 flat slab design to bs8110. In seismic design categories d1 and d2, when cantilevered floor joists. Here, we have tried to gather various reading materials available in the web about flat slab floor system in one place. A civil engineer must know all the aspects regarding the flat floor system. Hence in warehouses, offices and public halls some times beams are avoided and slabs are directly supported by. The beams reduce the available net clear ceiling height. 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.
Reinforced concrete design 1 design of slab examples and. Using aashto lrfd bridge design specifications 4th ed. For example, temporary construction loads caused by placing all of the precast. Ce 433, summer 20 slab design example 1 5 design a one. Asce, secb course content slab on grades construction. Total moment in slabs supported on circular column capitals 0 moments at design sections of slabs supported on. Structural steel composite slab 1 of 7 rev design project. The dimensions of an interior bay are shown in figure 1.
Therefore, the slab can be reinforced with shear reinforcement complying with detailing rules defined in subclause 7. Special design example 5172017 20 from earlier in the memo, for a 7 slab with 2 wearing course, eod thickness and coping thickness must be 9 using the new geometry for the edge of deck, the critical section depth i. Bending will take place in the two directions in a dishlike form. Residential structural design guide second edition hud user. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. L1084 32 abingdon villas page 35 of 70 pringuerjames consulting engineers. These materials are originally located at different websites. Girder slab technologies, llc 3 myers drive suite 10 mullica hill, nj 08062 phone. Strength investigation and strengthening of existing floor slabs. Woodframe floor systems and concrete slabongrade floors are discussed in this. Analysis, design and investigation of beams, one and twoway slab systems, flat plate, flat slab, waffle slab and slab bands. Design of reinforced concrete structures ii twoway slabs. 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.
Oneway simply supported slab analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter. The construction and design of concrete slabs on grade d. Each design example is based on the 8th edition of the aashto lrfd bridge design. Twoway concrete floor slab with beams design and detailing. 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. When floor joists cantilever beyond a support, joist size and spacing are. Reinforced concrete sk 33 section through slab showing stress due to moment.
Reinforced concrete slab design and detailing guide is456. Ce 433, reinforced concrete design summer 20 example slab design 1 2 material properties geometry compressive strength of concrete fc 5,000 psi span length of slab beam spacing l 18 ft center to center coefficient for depth of stress block 1 0. After this publication, it was subsequently adopted by the uniform building. Design of slab examples and tutorials by sharifah maszura syed mohsin example 1. 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. The slab is propped at the centre during construction stage. This document is a unique and comprehensive tool for design professionals. 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. A typical example of the decking layout for a composite floor is shown in. Find the following parameters for design moments in step 2 per unit width step 4 note.
Is part of this foundation design report and this foundation design report cannot be relied on without it. The performance of the footings and slab or both is largely depended upon a responsible approach by the builder and owneroccupier towards vegetation and site drainage. Assume partitions cannot be damaged by deflections. 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. Design project calculation sheet checked by pu date 080800 check the adequacy of the continuous composite profiled deck slab with spans of 3.
Flat plate concrete floor system does not use beams between columns or. Structural modeling and analysis of concrete floor slabs. The geotechnical report may document some assumptions or. Flat slab system is an important division of concrete floor system. This problem is exacerbated by the introduction of posttensioning, especially when beamless floor systems flat slabs are used. Design of reinforced concrete structures ii twoway slabs 8 c. Sep 03, 2011 reinforced concrete sk 33 section through slab showing stress due to moment. Sci p300 composite slabs and beams using steel decking best. The cross section of the profiled sheeting is shown in fig.
Introduction concrete slabs on grade are a very common type of concrete construction. The design procedure separately incl udes determining thickness of slab under wall load. Design of reinforced concrete structures ii twoway slabs 1 1. The decking should not cantilever beyond a support more than 600 mm or. Equivalent frame method most commonly used method the flat slab structure is divided longitudinally and transversely into frames consisting of columns and strips of slabs with. Design twoway slab as shown below to carry the live load 300kgm 2 f c 240 kgcm 2, f y 2,400 kgcm 2 3.
This guide covers the design and construction of composite slabs and beams, and. Floor slabs can range from a simple residential basement slab to a heavyduty industrial floor. The design shear force v d is below the maximum punching strength v rd,max. Accordingly, main reinforcement is required in the two directions. Posttensioned concrete design spreadsheet program a pdh. The minimum crack control reinforcement requirements do not apply to slabs and.
Plan view of floor system assume partitions will not be damaged by deflections. Design compressive normal force in the concrete flange. The purpose of this paper is to provide an overview of the strip method, including design examples. The design procedure set forth in that publication had at that time been in use by the author for about 15 years. Cross sectional constant defines torsional properties c x. Firstly, one has to check if the design shear force v d is smaller than the maximum punching strength v rd,max. This article discusses the similarities and differences between traditional frame methods and finite element methods for the design of floor slab systems. N c,f n p a pe f yp,d depth of the concrete in compression x pl n c,f 0,85 f cd b. Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3. Pci manual for the design of hollow core slabs and walls. Design of slab for flexure 067 m unit width of slab.
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