THE SHEAR STRENGTH OF REINFORCED CONCRETE BEAMS UNDER MULTIPLE POINTS LOAD

Abstract

The formula for calculating the shear strength of a reinforced concrete member is based on the result of a test under symmetrical concentrated loading at two points. In a spread foundation or multiple-pile footing of an actual structure, loading is distributed or applied at multiple points along multiple lines. For effective design of structures, therefore, establishing a shear strength calculation method that produces satisfactory result even for such loading distribution is important. Then, a method was proposed to calculate the shear strength of a beam while considering the mutual effects of the distances from the bearing and from the load. Verifications were made using the existing results of tests under symmetrical or unsymmetrical loading at multiple points. It was revealed that the proposed method reproduced the test results fairly accurately.