Experimental studies of the strength of bent reinforced concrete elements with crimp couplings of reinforcement

Abstract

Introduction. As indicated in the first part of the article published in the Industrial and Civil Engineering journal (No. 12, 2023), the relevance of the work is due to the increased volume of use of longitudinal reinforcement couplings in reinforced concrete structures. The analysis of the domestic and foreign regulatory and technical base has shown that there is an opportunity to optimize coupling connections in terms of arrangement of their spacing. In that work, prototypes were described for conducting experimental studies to assess the effect of various design solutions for the spacing of coupling joints of stretched reinforcement on the strength of normal sections of bent elements. This article analyzes the experimental strength data obtained and offers appropriate recommendations for the design of bent reinforced concrete structures with coupling joints.

Aim. Improvement of the urban planning system in terms of clarifying and supplementing of existing regulatory documents on the design of reinforced concrete structures.

Materials and methods. The research was carried out taking into account modern requirements, as well as the analysis of the results of their own experiments.

Results. The result of the work is an analysis of the experimental data obtained for bent reinforced concrete beams with coupling joints of stretched reinforcement. Based on the analysis, recommendations have been formed to optimize design solutions and clarify the requirements for the input control of couplings.

Conclusions. Considering that, in general, according to the results of the work, a fairly good convergence of experimental and theoretical results has been obtained, it is possible to assume a reduced value of coupling spacing for certain types of load-bearing reinforced concrete structures. The need to tighten the input control of couplings in order to detect defects has also been identified. In addition, the need for further research on this issue was noted.