预制混凝土梁柱节点试验及框架受力性能分析

提出了一种预制装配式混凝土梁柱节点采用I字型钢连接的节点方式，并进行了该节点在低周反复荷载作用下的试验.针对型钢连接的特征，提出了一种简化的等效十字连接方式用以模拟该节点.结合试验结果以及二维空间撒点，进行了简化节点的等效混凝土弹性模量以及钢筋屈服强度等关键参数的识别，从而可通过数值分析获得预制装配式节点的滞回曲线.根据预制装配式节点的连接方式形成框架结构，同时根据梁柱的配筋形成了现浇框架结构，采用Pushover分析了2种框架的承载力和刚度.利用简化的节点数值模拟滞回曲线进行了预制装配式框架结构在地震动作用下结构整体的受力非线性全过程分析.试验结果表明，该连接方式滞回环较饱满，节点抗震性能良好；数值分析结果表明采用型钢连接节点的预制装配式框架结构与同样梁柱配筋的现浇结构相比承载力和刚度有所提高，此装配式框架结构可满足我国抗震规范对于框架结构在弹性以及弹塑性阶段侧移限值的要求.
A new precast concrete beam-column joint connected by I-shaped section steel was presented.The precast concrete beam-column joint was tested under reversed cyclic loading.According to the characteristics of the I-shaped section steel connection，a simplified equivalent cross connection model was proposed to simulate the joint.Based on the experimental results of the joint and the stochastic point scattered in two-dimensional space，the equivalent elastic modulus of concrete and yield strength of steel bar were identified in the simplified cross connection model.Therefore，the hysteretic curve of the prefabricated concrete beam-column joint could be simulated easily by finite element analysis.A precast RC frame structure with six floors and three spans constructed by the precast concrete beam-column joint and a cast-in-situ RC frame structure with the same section and the same reinforcement ratio with the precast beam and column were analyzed by Pushover method.Meanwhile，according to the parameters identified from the experimental results，the nonlinear numerical simulation of the precast RC frame structure under seismic excitation was developed.The experimental results show the hysteric curve of the precast concrete beam-column joint was plump.The numerical simulation results present that the precast RC frame structure exhibits the satisfactory load-carrying and deformation capacity.Thus，the presented precast concrete beam-column joint can be used as a connected type for the fabricated concrete frame structure.