Shear Failure of Reinforced Concrete Beams


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Title: Shear Failure of Reinforced Concrete Beams

Author(s): Alexander Placas and Paul E. Regan

Publication: Journal Proceedings

Volume: 68

Issue: 10

Appears on pages(s): 763-773

Keywords: beams (supports); crack width and spacing; diagonal tension; I-beams; rectangular beams; reinforced concrete; research; shear strength; T-beams; web reinforcement.

Date: 10/1/1971

An extensive test program for the investigation of the shear resistance of reinforced concrete beams was carried out. Sixty-three T, I, and rectangular beams with varying cross section, web reinforcement, longitudinal reinforcement, concrete strength, and shear span were tested. Study of these and other results lead to the classification of shear failures into four basic modes. These modes are described and equations developed for the calculation of collapse loads for failures by diagonal tension, shearing, shear compression, and web crushing. The ultimate load in a given case is intrinsic to the failure mode corresponding to the least strength after diagonal cracking. A formula for calculating shear crack width is presented.