Diagonal Tension in Reinforced Concrete Beams


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Title: Diagonal Tension in Reinforced Concrete Beams

Author(s): Arthur P. Clark

Publication: Journal Proceedings

Volume: 48

Issue: 10

Appears on pages(s): 145-156

Keywords: no keywords

Date: 10/1/1951

Resistance of reinforced concrete beams to diagonal tension was investigated in a series of tests which included beams with no web reinforcement and beams with varying ratios of web reinforcement consisting of s-in. round deformed bars. Strains in the web and tensile reinforcement were measured with resistance strain gages; deflections of the beams under load were also measured and the number and extent of cracks were observed. Beams of two cross sections, four span lengths and concrete strengths rang-ing from 2000 to 6000 psi were tested for five different positions of concen-trated loads. One of the results of these tests, not previously demonstrated, is that the position of the loads on a beam influences considerably its shear carrying capacity. An empirical formula based on the data obtained in this study indicates that the shear resistance of the beams varies as the square root of the percentage of web reinforcement and linearly as the compressive strength of the concrete multiplied by a factor representing the ratio of effec-tive depth of beam to distance from plane of the nearest concentrated load point to plane of the support.