PROBLEMS AND METHODOLOGY OF RESEARCHING THE STATE OF STRESS AND DEFORMATION OF INCLINED SECTIONS OF REINFORCED BEAMS FROM HIGH-STRENGTH CONCRETE UNDER STATIC AND DYNAMIC LOADS

Abstract

Currently, the production of concrete of this type is not sufficiently organized in our country. Their implementation in practice requires the solution of a number of technological and scientific problems, in particular: - determining the possibility of using cements produced by domestic plants, as well as the most common types of aggregates; determination of the most effective chemical additives; establishment of the features of constructions made of these concretes and methods of their calculations. In view of this, the chosen research topic of high-strength concrete constructions is relevant.

The study of inclined cross-sections of high-strength concrete beams is an urgent task. And in order to try to solve it, it is necessary to perform experimental studies. The research aims to take into account the specifics of the work and improve the calculation of the strength of concrete and reinforced concrete elements made of high-strength concrete, which are destroyed by shear under static and dynamic loads.

To achieve the goal, the following tasks are solved: to experimentally investigate the deformed state of reinforced concrete beams made of high-strength concrete under the action of transverse forces; to establish the nature of the destruction and study the level of ultimate load of test samples; to provide proposals for improving the methodology for calculating bending elements under the action of a transverse force.

The subject of research is the strength of reinforced concrete beams oblique sections. Beams will be tested under static and dynamic loads. The object of research is reinforced concrete beams with estimated dimensions: span l = 1500 mm; cross section b x h = 80 x 120 mm. The beams are reinforced with a flat frame with two rods: lower Æ18А500С, upper Æ8А500С. Transverse reinforcement is located with different steps of reinforcing bars. In the clean zone, Æ6A400 rods are used with a step of 85 mm, and in the support zone of the same diameter with a step of 65 mm.