RESULTS OF EXPERIMENTAL STUDIES OF A REINFORCED CONCRETE ARCH MADE OF HIGH-STRENGTH CONCRETE ON THE ACTION OF LOW-CYCLE REPEATED LOADS

Abstract

Currently, the use of reinforced concrete arches is expanding in the construction of buildings and structures, in particular for fortification and civil defense buildings. Particularly noteworthy are arches made of high-strength concrete, which helps to reduce the weight of structures and loads on other structural elements of buildings, foundations and bases. Given the small number of experimental studies of reinforced concrete arch structures and the lack of such studies of arches made of high-strength concrete, it is relevant to study the stress-strain state of arches made of high-strength concrete under the influence of force effects of various nature and intensity by experimental means. The task was to determine, through experimental and theoretical studies of a reinforced concrete arch made of high-strength concrete, the change in the stress-strain state in the cross-sections of the curved belt and the nature of their destruction under the action of low-cycle repeated loads. To perform the experimental studies, the main prototype in the form of a hollow two-joint reinforced concrete arch with a high-strength concrete tie was made and auxiliary samples - cubes and prisms - were used to determine the physical and mechanical characteristics of concrete. The mechanical characteristics of concrete (cube and prism strengths) under a single short-term load were determined by standard methods. The paper presents the methodology and results of experimental studies of a reinforced concrete arch with a tie-in made of high-strength concrete. The stress-strain state of the arch under the action of static low-cycle repeated loads of different levels until destruction is described, and its bearing capacity is determined. The graphs of load and deformation dependence of concrete and reinforcement, deflections and movement of arch supports on loads are presented and described. The process of crack formation and crack development in a reinforced concrete arch under the action of repeated loads of different levels is described. The experimental reinforced concrete arch with a tightening was tested for static short-term low-cycle repeated loading until failure