The ultimate strength of reinforced concrete beams in shear

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Abstract
Summary This paper summarizes conclusions drawn from tests on a number of beams of identical dimensions but of different concrete strengths and from a re-assessment of tests on beams of various dimensions reported by Sunderland(1)* and Wilby.(2)* The limitations of recently advanced shearcompression moment theories are demonstrated and a new expression is developed on similar principles. A theoretical analysis of shrinkage stresses is developed to predict the loads at the appearance of bending and diagonal tension cracks, whereby it is shown that the shrinkage stresses may have an effect on the ultimate shear resistance. Three divided beams were tested in an attempt to measure directly the separate contributions to shear resistance made by the concrete, the web reinforcement, and the longitudinal reinforcement. In these beams a gap was pre-formed on the expected line of the diagonal tension crack and the concrete in the compression zone was replaced by a mechanical device to record direct force and shear force. The results are examined in relation to a mathematical analysis of the shear force resisted by the dowel action of the longitudinal reinforcement.
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