Abstract
The basic ACI 318 two-way shear strength provision was developed in 1963 based on a statistical analysis of test results on scaled specimens that were believed to have failed in shear. This paper demonstrates, based on an extensive literature review and experimental research, that the applicability of the ACI 318 provisions for typical lightly reinforced slabs is questionable. In typical lightly-reinforced slab-column connections, extensive flexural yielding is likely to occur before the computed punching shear capacity is reached. Several researchers have shown that the use of the basic ACI two-way shear strength provision yields results that are unconservative compared with the two-way shear strength of slabs in experimental tests. The authors recommend that the two-way shear strength of lightly-reinforced connections be reduced.
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