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Unformatted text preview: Module 8 Reinforced Concrete Slabs Version 2 CE IIT, Kharagpur Lesson 18 Oneway Slabs Version 2 CE IIT, Kharagpur Instructional Objectives: At the end of this lesson, the student should be able to: • state the names of different types of slabs used in construction, • identify oneway and twoway slabs stating the limits of l y /l x ratios for one and twoway slabs, • explain the share of loads by the supporting beams of one and twoway slabs when subjected to uniformly distributed vertical loads, • explain the roles of the total depth in resisting the bending moments, shear force and in controlling the deflection, • state the variation of design shear strength of concrete in slabs of different depths with identical percentage of steel reinforcement, • assume the depth of slab required for the control of deflection for different support conditions, • determine the positive and negative bending moments and shear force, • determine the amount of reinforcing bars along the longer span, • state the maximum diameter of a bar that can be used in a particular slab of given depth, • decide the maximum spacing of reinforcing bars along two directions of oneway slab, • design oneway slab applying the design principles and following the stipulated guidelines of IS 456, • draw the detailing of reinforcing bars of oneway slabs after the design. Version 2 CE IIT, Kharagpur 8.18.1 Introduction Version 2 CE IIT, Kharagpur Slabs, used in floors and roofs of buildings mostly integrated with the supporting beams, carry the distributed loads primarily by bending. It has been mentioned in sec. 5.10.1 of Lesson 10 that a part of the integrated slab is considered as flange of T or Lbeams because of monolithic construction. However, the remaining part of the slab needs design considerations. These slabs are either single span or continuous having different support conditions like fixed, hinged or free along the edges (Figs.8.18.1a,b and c). Though normally these slabs are horizontal, inclined slabs are also used in ramps, stair cases and inclined roofs (Figs.8.18.2 and 3). While square or rectangular plan forms are normally used, triangular, circular and other plan forms are also needed for different functional requirements. This lesson takes up horizontal and rectangular /square slabs of buildings supported by beams in one or both directions and subjected to uniformly distributed vertical loadings. The other types of slabs, not taken up in this module, are given below. All these slabs have additional requirements depending on the nature and magnitude of loadings in respective cases. (a) horizontal or inclined bridge and fly over deck slabs carrying heavy concentrated loads, (b) horizontal slabs of different plan forms like triangular, polygonal or circular, (c) flat slabs having no beams and supported by columns only, (d) inverted slabs in footings with or without beams, (e) slabs with large voids or openings, (f) grid floor and ribbed slabs....
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 Summer '01
 Prof.J.N.Bandopadhyay

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