Some material specifications use the allowable stress design asd approach while others use load and resistance factor design lrfd. Pdf design of a durable roof slab insulation system for tropical. Construction of slab on ground design elements the construction of slab on ground requires certain basic design elements. Pdf the ferrocement hollow box roof slab was evolved from the concept of the reinforced concrete waffle slab except for the addition of. Pdf slabs are the flooring systems of most structures including office, commercial and residential buildings, bridges, sports stadiums and. The reason why, concrete and steel are used together to construct rcc slab, is in their individual properties as separate building materials and their individual limitation. Designing a simply supported reinforced concrete one way. Design example on composite steel deck floor slabs by thomas j. Oneway and twoway slabs oneway slabs transfer the imposed loads in one direction only. Master of science and hereby certify that, in their opinion, it is worthy of acceptance. Following are the rcc slab design and detailing guidelines.

Ribbed slabs oneway joists introducing voids to the soffit of a slab reduces dead weight and increases the efficiency of the concrete section. The slab or roof slab object is a threedimensional 3d body bounded by a planar polygon perimeter of any shape, and has multiple edges. Modular precast concrete floor and roof slabs are machine manufactured under. Concrete floor slabs on grade are subjected to a varie ty of loads and loading conditions. Oneway and twoway slabs university of asia pacific. The slab has to carry a distributed permanent action of 1. Design the roof slab, beam and column of house given in figure 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. 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. For 1m slab width, moment, shear force, oneway continuous slab for continuous slab, moment and shear force can be obtained from table 3. A slightly deeper section is required but these stiffer floors facilitate longer spans and provision of holes. These materials are originally located at different websites. Design project calculation sheet checked by pu date 080800 check the adequacy of the continuous composite profiled deck slab with spans of 3. 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.

The design procedure separately incl udes determining thickness of slab under wall load. When a slab is supported directly on columns, without beams and girders, it is called a flat plate or flat slab. R walchand institute of technology, solapur, india abstract. Complete design of a home typically requires the evaluation of several different types of materials as in chapters 4 through 7. Design of a durable roof slab insulation system for. Methods of analysis and design it shall be permissible to design the slab system by one of the following methods. S professor, faculty of engineeringcivil walchand institute of technology, solapur, india kondekar a. Slab designs structural slab designs structural 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. Chapter 4 uses the lrfd method for concrete design and the asd method for masonry. The planar roof slabs are further classified as follows. Analysis and design of slabs one way civil engineers pk. Reinforced concrete design 1 design of slab examples and.

Reinforced concrete sk 33 section through slab showing stress due to moment. Design of slab for flexure 067 m unit width of slab. Flat slab analysis, design and detailing pdf civil. Roof slab system free download as powerpoint presentation. Structural steel composite slab 1 of 7 rev design project. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. Flat slab system is an important division of concrete floor system. In each case the applicable limitations given in 31.

Concrete is good in taking compression and steel is good in tension. 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. Blast design procedure for flat slab structures dtic. Reinforced concrete slab design and detailing guide is456. In this post, i will go over the third example in our course that covers the analysis and design of reinforced concrete oneway slabs. The design of composite slabs and beams is discussed in detail in relation to the eurocodes and bs 5950. It is recommended to add lateral bracing at 8ft spacing at beam connections. Asc steel deck roof and floor deck products are designed. Design of 24m span hyperbolic shell slab and its application in the. The goal of this reinforced concrete design example is to design a simply supported reinforced concrete oneway slab subjected to. Construction of slabs on ground design considerations aci.

These design elements must be enlisted and added in the contract documents by the designer in charge before asking for a bidding. If slab is supported on all four sides and r shorter side longer side slab. Bridge approach slab analysis and design incorporating elastic soil support presented by. They may be supported on two opposite sides only fig. 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. Jun 30, 2014 analysis and design of deep foundation using midas gen and soilworks. Such slabs generally are designed by empirical methods. Flat slab analysis, design and detailing pdf civil engineering.

Reinforced concrete slab design using the empirical method. A slab supported on four sides and with reinforcing steel perpendicular to all sides is called a twoway slab. About slabs and roof slabs autocad architecture 2017. The locations of the strips are usually governed by the locations of the slab supports. Jan 15, 2017 in this post, i will go over the third example in our course that covers the analysis and design of reinforced concrete oneway slabs. Department of mechanics, materials and structures english. Flat roof slabs become popular daybyday due to the. Slabs having supports on less than four sides can be designed as oneway. The slab is propped at the centre during construction stage. The axial force, moments and shears for a particular strip are recovered from the analysis on the basis of the wood armer tech. If slab is supported on all four sides and r shorter side longer side sep 03, 2011 reinforced concrete sk 33 section through slab showing stress due to moment. Filler slab technology is a simple and a very innovative technology for a slab construction. Finite element modeling by sap 2000 software verified by manual.

L center to center distance between the support b depth of slab. A twoway slab is divided into strips for design purposes. The goal of this reinforced concrete design example is to design a simply supported reinforced concrete oneway slab subjected to dead and live loads per aci code 31811. Many historical buildingsmonuments have been built having shape of a pyramid. Is it the concept of the roof, or the concept of the slab that takes precedence, or are the two concepts so intertwined that they must. Oneway simply supported slab analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter. Analysis and design of pyramidal roof slab patil s. The design procedure includes determini ng slab thickness based on moving live loads and then checking adequacy of slab thickness for stationary live load. The structural design of the roof or floor deck is done by. Design of slab examples and tutorials by sharifah maszura syed mohsin example 1.

Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3. Minimum slab thickness of rc slab to prevent undesirable. Expected snow load syazli 2005 2 the basic design principle in the pitched roof is that by overlapping materials in the downslope direction, and by providing a. Since boxtype flat slab roof magazines are popular with operations. This a question that philosophers have long pondered. 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. Design oneway slab as shown below to carry the live load 500kgm 2 f c 210 kgcm 2, f y 2,400 kgcm 2 0. Find the following parameters for design moments in step 2 per unit width step 4 note. The object is defined by its perimeter, edge conditions, and style. Slabs and roof slabs are autocad architecture objects that you use to model floors, roof faces, and other flat surfaces where edge conditions need to be specified.

Effective span of slab shall be lesser of the two 1. To compare manual results of analysis with software. The floor is first cleaned and then some bitumen is sprinkled over the surface and then bitumen stabilised sheets are rolled over the surface and joined with other at edges by applying heat through gas torch. Pdf flat roof slabs become popular daybyday due to the advantages like cyclonic resistance, the possibility of future vertical extension, and the. The saving of materials tends to be offset by some. The cross section of the profiled sheeting is shown in fig. A civil engineer must know all the aspects regarding the flat floor system.

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