钢梁贯通型装配式混凝土框架梁柱节点恢复力模型研究

为研究装配式混凝土干连接节点在地震作用下的动力特性,文章设计制作了6个新型装配式节点,通过改变面承板厚度、钢环箍厚度、面承板宽度和钢梁翼缘厚度进行试验,研究不同变量对节点抗震性能的影响。基于试验结果及加载过程中的试验现象,结合三折线模型对数据进行处理,拟合出计算骨架曲线,并在此基础上,结合滞回规则拟合出计算滞回曲线。将拟合所得计算骨架曲线和计算滞回曲线与试验所得曲线进行对比,吻合度均较好。结果表明:根据三折线模型拟合出的计算骨架曲线可以较好地反映该节点的受力特征;根据滞回规则得到的计算滞回曲线可以有效反映该节点的滞回性能。该恢复力模型可为该类装配式节点的抗震性能分析提供参考。

In order to study the dynamic characteristics of prefabricated concrete dry-connected joints under earthquake, six new prefabricated joints are designed and manufactured in this paper. The influence of different variables on the seismic performance of the joint is studied by changing the thickness of the surface bearing plate, the thickness of the steel hoop, the width of the surface bearing plate and the thickness of the steel beam flange. Based on the test results and the test phenomena during the loading process, the data are processed and fitted to calculate the skeleton curve by combining with the tri-line model. On this basis, the hysteretic curve is calculated according to the hysteretic rule. The calculated skeleton curve and hysteretic curve obtained by fitting are compared with the curve obtained by test, and the coincidence is good. It shows that the calculated skeleton curve fitted by the tri-line model can well reflect the stress characteristics of the joint; the calculated hysteretic curve obtained according to the hysteretic rule can effectively reflect the hysteretic performance of the joint. The restoring force model proposed in this paper can be used as a reference for the seismic performance analysis of this type of prefabricated joints.