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Design of singly reinforced T-beams – cantilever/simply supported beams- Design of continuous beams using B.M. coeffts (equal spans & u.d.l only) – use of design aids (not for examination) – Design of Lintel simple problems(not for Exam.)
T Beam Introduction:
Design of reinforced concrete beams involves sizing and finding required quantity of steel based on the consideration of strength and serviceability requirements. It also involves detailing. The major consideration in the design of beams is bending moment. Hence first, beams are designed for bending moment and then the design for shear is taken up. Checks are applied for deflection and crack width. If the requirement for any limit state fails redesign is to be made. The detailing of reinforcement is to be made with neat sketches/drawings taking into account bond, cracking and durability considerations. Such kind of design consideration has been discussed.
Floor joist deflection and maximum design moment are decreased by utilizing continuous joists over two or more spans compared to simply supported joists. Splices are used to attain the lengths required for continuous members. The splices, whether nailed, bolted, glued, or truss plated, if located at an interior support, will have rotational slip occur when subjected to bending moment. Thus the beam continuity is disrupted with the joist acting somewhere between a simply supported and a fully continuous beam.