Experiment on Restoring Force Model of RAC Beam Column Joints

Abstract

The purpose of this paper is to analyze component failure mode under different working conditions and based on this, this paper mainly studies the restoring force model of RAC beam column joints by carrying out an experimental research on the restoring force model of four frame beam column joints with different axial compression ratio (1.5, 2.5) and different recycled coarse aggregate substitution rate (0%, 50%, 100%). The analysis of the result of the experiment shows that the failure process of the RAC beam column joints was similar to that of the common concrete joints, and both experienced four stages of initial crack-crack-limit- failure. Through a comparative analysis of the characteristics of the hysteresis curve and the skeleton curve of the RAC beam column joints, and based on experimental data fitting and theoretical analysis and calculation, the restoring force skeleton curve model of the RAC beam column joints with different substitution rates and the restoring force model of the RAC beam column joints with rigidity degradation law were established.