不同构造特征的H形钢梁-柱半刚性连接节点抗震性能试验研究及有限元分析

Experimental study and finite element analysis of seismic performance of extended end plate semi-rigid connection with different details

通过对6个具有不同构造特征和几何尺寸的H形钢梁-柱半刚性连接试件进行拟静力试验和有限元分析,得到节点弯矩-转角(M-θ)滞回曲线及M-θ骨架曲线,分析了试件的极限弯矩、连接初始刚度、延性、耗能性等性能。研究结果表明:对于几何尺寸相近的梁柱端板连接,柱强轴方向翼缘-端板连接的极限弯矩及初始连接刚度远高于柱弱轴方向的腹板-端板连接,且后者的延性也比较差;采用弱轴方向的端板连接,应在腹板的两个方向同时设置加劲板,以保证有足够的连接强度和延性;在柱翼缘设置抗剪托板对于梁柱外伸端板连接性能无明显影响,而且延性还有降低趋势。

Based on quasi-static tests and finite element analysis of six specimens of H-type steel beam to column extended end plate semi-rigid connections with different details and geometrical dimension,the hysteretic characteristics curves and M-θ curves of core region of connections were obtained,and the key parameters such as ultimate moment of the connection,initial stiffness,ductility and energy dissipation of the connection were analyzed.The test results show that the ultimate moment and initial stiffness of the flange-end plate connections are much higher than that of web-end plate connections,and the later is poor in ductility.If the weak connection of web to end plate is uesd,stiffening ribs in two direction of the web of column should be set to get better strength and ductility.Settlement of the supporting plate against shearing force on flange plate of column has no evident effect on characteristics of the extended beam to column end plate connection,and the everall ductility of the connection will tend to decrease.