RESULTS OF EXPERIMENTAL RESEARCH OF A REINFORCED CONCRETE ARCH FROM HIGH-STRENGTH CONCRETE

Abstract

Reinforced concrete arch structures are widely used to cover industrial, civil, agricultural buildings, as well as load-bearing structures of engineering structures, in the construction of artificial transport structures, in fortification construction. There is a small number of experimental studies of the stress-strain state of reinforced concrete arches under force influences of different action and intensity both in Ukraine and abroad. There are no data on studies of the stress-strain state of arch structures made of high-strength concrete under the action of single and repeated static and dynamic loads in the scientific literature. The aim of this work is to determine, by means of experimental and theoretical studies of reinforced concrete arches made of high-strength concrete, the change of the stress-strain state in the cross-sections of the curved belt and the nature of their destruction under the action of static loads. To achieve this goal, the following tasks were solved: developed the design and manufactured prototypes of high-strength concrete; developed a methodology for experimental research and performed tests of prototypes; processed and analyzed experimental data. To perform experimental studies of the 2nd series, the main prototypes were made in the form of 3 double-joint reinforced concrete arches of high-strength concrete of class C75. The arch A-1(2) was tested in the installation mounted on the basis of the hydraulic press UIM-200 for the action of step short-term static load to destruction. The destructive load for the arch A-1(2) according to the results of experimental studies was Рu = 90 kN. The deflection of the arch at the last stage of loading was f = 7 mm, the dependence of the change in deflection on the loads to failure has a clearly expressed linear character. At the 18th stage of loading at Ru = 90 kN, the deflection and crack opening width in the arch belt reached the limit values.