Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. Reinforced slab bridge designaashto allowable stress. Design example on composite steel deck floor slabs by thomas j. L1084 32 abingdon villas page 35 of 70 pringuerjames consulting engineers.
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. Investigations on simply supported concrete bridge deck slab. The trial depth is selected based on spandepth ratio of 7, as in is. Sachpazis date 18012014 chkd by date appd by 1 flat slab design to bs8110. According to the way loads are transferred to supporting beams and columns, slabs are classified into two types. Total moment in slabs supported on circular column capitals 0 moments at design sections of slabs supported on. Bending will take place in the two directions in a dishlike form.
Design of slab for flexure 067 m unit width of slab. The slab is propped at the centre during construction stage. Reinforced concrete sk 33 section through slab showing stress due to moment. In addition to providing a single design procedure applicable to all types of concrete slab systems reinforced in more than one direction, the revised code contains major changes in the assumptions required to determine slab design moments by use of a. The building is located in seismic zone iii on a site with medium soil. Structural modeling and analysis of concrete floor slabs. Given below, the sample spreadsheet for creating the design of two ways slab with the help of coefficient method.
The beamslab layout design task is an illdefined problem. Therefore, the slab can be reinforced with shear reinforcement complying with detailing rules defined in subclause 7. Oneway slabs normally design as a beam with cables running in the direction of the span at uniform centres. Then i saw that it came in a sample slab as well and thought pcgs must be considering using the double slab on other coins. A slab strip of unit width is analysed using simple beam theory. When zd is determined, the prestressing force required to balance an. 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. Analysis and design of slabs one way civil engineers pk. Find the following parameters for design moments in step 2 per unit width step 4 note. The design of composite slabs and beams is discussed in detail in relation to the eurocodes and bs 5950. 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.
Girder slab technologies, llc 3 myers drive suite 10 mullica hill, nj 08062 phone. Design project calculation sheet checked by pu date 080800 check the adequacy of the continuous composite profiled deck slab with spans of 3. This problem is exacerbated by the introduction of posttensioning, especially when beamless floor systems flat slabs are used. Pdf automated layout design of beamslab floors using a. In this post, we are going to show how we can analyse and design cantilever slabs subjected to floor. In this paper different conditions of the slab edges are taken the same as are defined in 4 numbered 1 to 9. 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. Design assumptions strap is infinitely rigid strap is a pure flexural member and does not take soil reaction. Design of strap or cantilever footings falmatasaba. Design of reinforced concrete structures ii twoway slabs 1 1. 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.
Flat slab design spreadsheet civil engineering community. 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. 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. It is recommended to create the design of slab with the use of excel sheet as the process will be very simple and lots of time will be saved. Investigations on simply supported concrete bridge deck. They are projections from wall face of lintel beams or floor slabs. Civilax is the knowledge base covering all disciplines in civil engineering. 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. Design of cantilever slab spreadsheet engineering books. Design of reinforced concrete slab with regard to explosions. For 1m slab width, moment, shear force, oneway continuous slab for continuous slab, moment and shear force can be obtained from table 3.
Flat slab analysis, design and detailing pdf civil engineering. Design of reinforced concrete slab with regard to explosions master of science thesis in the masters programme structural engineering and building performance design rickard augustsson markus harenstam department of civil and environmental engineering division of structural engineering concrete structures chalmers university of technology. The cross section of the profiled sheeting is shown in fig. In twoway slabs shorter direction strip carry greater %age of load. The cantilever retaining wall shown below is backfilled with granular material having a unit weight. The beam slab layout design task is an illdefined problem. Structural steel composite slab 1 of 7 rev design project. Equivalent frame method simplified for beam and slab. Voided twoway slab design based on aci 31814 spreadsheet. Use the aci 318 direct design method to design an interior bay of a flat plate slab system of multi bay building. Just recently a new slab was produced by pcgs, it was brought about by the two coin 75th anniversary set that was so very popular this year. Using aashto lrfd bridge design specifications 4th ed. 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. Application and use of this information requires design by a registered professional structural engineer.
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. The design shear force v d is below the maximum punching strength v rd,max. Reinforced concrete, slab, beam, explosion, impulse load, dynamic. 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. Design compressive normal force in the concrete flange. 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. Accordingly, main reinforcement is required in the two directions. This pdf file contains a chapter of 23 pages with various aspects of flat slabs including four example of flat slab design. General design process though many details must be included in the design of a slab on grade, three important components are slab thickness, reinforcement. Background of simple design method 12 membrane forces along yield lines 2 simple design method of reinforced concrete slabs at 20 c k,b are parameters defining magnitude of membrane forces, n is a factor deduced from yield line theory, k is the ratio of the reinforcement in the shorter span to the reinforcement in the longer span. 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. To achieve this, architects normally extend the slab beyond the ground floor building line, thereby forming a cantilever. A completely changed design procedure for slabs was proposed in the february i970 aci journal. Even while designing they are considered as one slabs with cantilever fixed or continuous at supports. Flat slab analysis, design and detailing pdf civil. A six storey building for a commercial complex has plan dimensions as shown in figure 1. As a result, it is difficult to delegate this task to computers.
The distribution of slab moments into column strips and middle strips is to be made in the same manner as specified in direct design method. The slab moments from fea agreed reasonably well with the. If slab is supported on all four sides and r shorter side longer side files. Cantilever slabs are common features in buildings due to the need to have bigger spaces at upper floors. Concrete pool design spreadsheet based on aci 31814. Analysis and design of slabs two way civil engineers pk.
Design of reinforced concrete structures ii twoway slabs. Slabs having supports on less than four sides can be designed as oneway. In all of these conditions of the slab edges, the four edges are supported and the fixing conditions only are different see fig. The dimensions of an interior bay are shown in figure 1. If slab is supported on all four sides and r shorter side longer side slab. Assuming that the allowable bearing pressure of the soil is 120 knm. Slab resting on walls or sufficiently deep and rigid beams on all sides. Aug 28, 2016 cantilever slabs are a typical one way slabs. Structural design of cantilever slabs solved example. Investigations on simply supported concrete bridge deck slab for irc vehicle 717 loadings using finite element analysis international journal of earth sciences and engineering issn 09745904, volume 04, no 06 spl, october 2011, pp 716719 was modeled and the reinforcing steel was ignored. This study proposes a new genetic algorithm to be used to perform this. Pdf cantilever slab design ramjan shehzaad academia.
Even while designing they are considered as oneslabs with cantilever fixed or continuous at supports. To confirm with this, strap is constructed slightly above soil or soil under strap is loosened. Twoway slabs have two way bending unlike oneway slab. The design approach for structures submitted to explosions differ from the common statically approach and are not well documented. Sep 03, 2011 reinforced concrete sk 33 section through slab showing stress due to moment. 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. Flat plate concrete floor system does not use beams between columns or. We use your linkedin profile and activity data to personalize ads and to show you more relevant ads. In any span, the max cable sag, zd depends on the concrete cover requirements and the tendon dimensions. Oneway simply supported slab analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter. Slabs are usually used in floor and roof construction.
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