Transcription of Chapter 2 Design for Shear - Engineering
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Chapter 2 Design for Shear - Engineering
Chapter 2 Design for Shear By Richard W. Furlong Introduction Shear is the term assigned to forces that act perpendicular to the longitudinal axis of structural elements. Shear forces on beams are largest at the supports, and the Shear force at any distance x from a support decreases by the amount of load between the support and the distance x. Under uniform loading, the slope of the Shear diagram equals the magnitude of the unit uniform load. Shear forces exist only with bending forces. Concrete beams are expected to crack in flexure, with such cracks forming perpendicular to longitudinal tension reinforcement, , perpendicular also to a free edge.
indicated by the vertical bars in Fig. 2.2. The stirrups act as tension hangers with concrete performing as compression struts. Shear Reinforcement for Beams 45o Shear cracks are pinned V c d together by stirrups. s s s s V s = A vf yd/s Standard U-stirrup A v = 2 A bar has 2 legs. Fig. 2.2 – Shear reinforcement
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