EXPERIMENTAL STUDY OF CRACK RESISTANCE AND SHEAR STRENGTH OF REINFORCED POINT-LOADED CONCRETE BEAMS

Abstract

The issues of crack resistance and strength of reinforced concrete bending moment have been most comprehensively studied for the cases of simple bending and rather understudied for general cases of bending, despite the significant number of experimental and theoretical researches in this area. The recognized reinforced concrete scientists put this research lag down to the complexity of stress strain behaviour in areas concurrently loaded by the shear force and bending moment and to the lack of a reliable theory of concrete strength.  This is actually the lack of a reliable theory of concrete strength that prevents laying down a theoretical base for solving this problem. This is why the research in this area is mostly experimental.

The paper discusses the experimental studies of oblique planes of simple-span point-loaded reinforced beams at а/d=0.5. The tested beams had identical characteristics and differed only in the type of reinforcement of the oblique planes. The analysis of the experimental studies revealed the specificities of nucleation and propagation of oblique cracks in the zones under the action of the shear force and bending moment. The effect of various types of reinforcement on the bearing capacity of the beams was also studied.