Shear Strength of Reinforced Concrete Beams under Uniformly Distributed Loads

摘要

An analytical theory for shear resistance of reinforced concrete beams subjected to uniformly distributed loads is presented. Slender beams with a span length-to-depth ratio (e/d) greater than 10, as well as deep beams in which e/d < 10, are examined; and simple expressions are derived for the ultimate shear capacity. The impact of size effect in the shear strength of slender beams is taken into account. A criterion for minimum shear reinforcement is also considered. The derived formulas are verified by comparisons to well-grounded experimental data from the literature. Data were obtained on slender beams and deep beams with various strengths of concrete, longitudinal steel ratios, shear reinforcement ratios, l/d, and geometrical sizes. The shear strength of beams, both slender and deep, under a uniform load is found to be much higher than the shear strength of beams under a loading arrangement of two concentrated loads at the quarter points.