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. Principal tension stresses change direction from horizontal at the longitudinal reinforcement to 45o at the neutral axis and vertical at the location of maximum compression stress.
Table 2b contains values Kvs for determining nominal stirrup capacity Vs = Kvs(Av/s). Table 2c gives values Kvc in kips. Kvc is the shear strength of concrete when required stirrups areused in members made with fc’ = 4000 psi concrete. The nominal strength of a rectangular section is the sum of concrete strength Vc and reinforcement
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