剪压比影响下配置HRB500E钢筋梁柱节点试验研究

由于高性能钢筋(HRB500E)具有良好的延性性能和抗震性能,本文拟对配置HRB500E钢筋混凝土梁柱中间节点的抗震性能进行相关研究。通过对3个梁柱中间节点足尺试件进行拟静力加载试验,研究剪压比对梁柱中间节点破坏模式、滞回特征和延性性能的影响。试验结果表明,配置HRB500E钢筋混凝土梁柱中间节点具有良好的抗震性能。随着剪压比的增加,试件的破坏模式发生转变,即由梁端弯曲破坏变为节点核心区剪切破坏;试件的滞回曲线所包围的面积明显增加,并且在加载后期时,试件滞回环的峰值荷载退化变快。同时,随着剪压比的增大,试件的梁屈服荷载和最大荷载显著增大;试件的梁屈服位移也逐渐增大,而屈服位移的增大引起了梁柱中间节点延性系数的减小。

Experimental Research in Influence of Shear-compression Ratio on the Interior Beam-column Joint with HRB500 E Reinforcements

Since high performance reinforcements （HRB500E） have the advantages of better ductility and earthquake-resistant behavior,this paper focused on the seismic behavior of interior RC beam-column joints with HRB500E reinforcements. Three full-scale interior beam-column joint specimens were tested to failure under quasi-static load. The influence of shear-compression ratio on the failure mode, hysteretic characteristic and ductility behavior of interior RC beam-column joints were investigated. The results indicate that interior RC beam-column joints with HRB500 E reinforcements generally have a good seismic behavior. To be more specific, as the shear-compression ratio increases, the failure of the specimens changes from flexural failure of beam end to shear failure of joint core; the area of hysteretic curve increases greatly, and at the later stage of the loading, the peak load of hysteretic loop decreases rapidly. In the meantime, the yield load and the maximum load increase, the yield displacement also increases as well, which leads to the decrease of ductility coefficient of the joints.