T型钢半刚性连接梁柱节点抗震性能试验研究

Experimental study on T-stub semi-rigid beam-column connection seismic behavior

通过对两组T型钢连接梁柱节点的单向与循环加载试验,了解该类型节点的抗震性能以及翼缘厚度对节点抗震性能的影响,并通过IDARC程序模拟节点的受荷过程,讨论T型钢连接梁柱节点理论建模的方法。试验研究表明:T型钢梁柱连接滞回曲线饱满,连接表现出了良好的延性,极限转角均超过了欧洲规范规定的极限转角0.03rad,具有较为理想的抗震性能;T型钢翼缘越厚,节点初始刚度、承载力以及耗能能力越大;对于半刚性连接中螺栓刚度大于T型钢翼缘刚度的试件应按T型钢的极限承载力设计。程序分析表明:利用刚度均匀变化的节点板模拟T型钢的半刚性连接具有较高的模拟精度,通过调整节点板底部刚度以及屈服弯矩可以模拟不同翼缘厚的T型钢半刚性连接。

The uniaxial and cyclic loading experiments are carried out on two groups of T-stub beam-column joints specimens to obtain the seismic behavior of T-stub joints and flange thickness effects on the seismic behavior of joint.The theoretical modeling method of T-stub beam-column joints is discussed based on the loading process of joint by IDARC program simulation.The experimental results show that for T-stub beam-column joints the hysteresis loops is plump and the ductility is good.The limiting rotation angles all exceed 0.03rad regulated by Euro code.Ductility,bearing and energy dissipation capacity of the connections increase along with the increasing of T-stub flange＇s thickness.When the stiffness of bolt is greater than that of T-sub＇ flange,the ultimate bearing capacity of T-sub shall be in accordance with the bolt.IDARC analysis shows that using a gusset plate to simulate the T-stub semi-rigid connections will result in a higher accuracy.By adjusting the stiffness of gusset plate bottom and yield moment can simulate the T-stub semi-rigid connections of different flange thicknesses.