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通过对再生粗骨料取代率分别为0%、50%、100%的3榀框架梁柱节点进行抗震性能试验研究,分析了3种取代率下再生混凝土梁柱节点抗震性能和破坏形态,在此基础上重点研究了再生混凝土梁柱节点恢复力模型。分析试验结果发现,再生混凝土梁柱节点与普通混凝土节点破坏过程相似,均经历了初裂—通裂—极限—破坏四个阶段,通过对比分析再生混凝土梁柱节点滞回曲线和骨架曲线特征,基于试验数据拟合与理论分析计算,建立了包含不同取代率再生混凝土梁柱节点恢复力骨架曲线模型和刚度退化规律的再生混凝土梁柱节点恢复力模型。
The seismic performance of 3 truss beam-column joints with recycled coarse aggregate substitution rates of 0%, 50%, and 100%, respectively, is studied. The seismic behavior and failure modes of the regenerated concrete beam-column joints under three kinds of replacement rates are analyzed. Based on this, the restoring force model of beam-column joints of recycled concrete is studied emphatically. Analysis of test results shows that the failure of recycled concrete beam-column joints is similar to that of ordinary concrete joints, and has experienced four stages of initial crack-crack-limit-failure. By comparing and analyzing the characteristics of the hysteretic curves and the skeleton curves of recycled concrete beam- Based on the experimental data fitting and theoretical analysis and calculation, the restoring force model of regenerated concrete beam-column joints was established based on the skeleton curve model and the stiffness degeneration law of the restored beam-column joints of recycled concrete beams with different substitution rates.