Abstract
Current design codes are inconsistent regarding whether or not the spacing of stirrups should be limited across the web of a deep-beam region. This study evaluates the benefit of distributing stirrups across the web of beams subjected to deep-beam shear. Full-scale beams were fabricated and tested in a total of six tests. Four tests were conducted on specimens with a 21 x 44 in. (530 x 1120 mm) cross section and two tests were conducted on beams with a 36 x 48 in. (910 x 1220 mm) cross section. Experimental variables were the number of stirrup legs distributed across the web and the amount of web reinforcement. The results showed that the addition of closely spaced stirrups did not significantly improve the shear capacity or serviceability performance of the beams. Since web reinforcement is relatively ineffective in a deep beam, limiting the stirrup spacing across the web may be inefficient. In many cases, intermediate stirrup legs are unnecessary in deep beams as wide as 36 inches.
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