携裂纹翼缘板加强型节点抗震性能试验研究

Experimental study on seismic performance of reinforced joint of flange plate carrying crack

为了研究梁翼缘端部角焊缝处裂纹位置对节点抗震性能的影响,针对翼缘板加强型节点设计了3个局部试件和2个1/2缩尺试件,分别进行拉卸循环加载试验和低周循环往复加载试验,分析节点指定路径不同裂纹位置上的力学性能。研究表明:存在初始裂纹试件的滞回耗能、承载力和延性性能均有所降低,初始裂纹存在的位置直接影响试件裂纹扩展、应变分布及断裂情况,其中位于加强板端部角焊缝中部位置的初始裂纹对节点的力学性能影响更为显著。

In order to study the influence of the crack position at the end fillet weld of the beam flange on the seismic behavior of joints,three local specimens and two 1/2 scale specimens were designed for the flange plate reinforced joint.The tension-unload cycle loading tests and low cycle reciprocating loading tests were carried out respectively to analyze the mechanical properties of joints at different crack positions in the specified path.The results show that the hysteresis energy dissipation,bearing capacity and ductility of the specimens with initial cracks are reduced,and the location of the initial cracks directly affects the crack growth,strain distribution and fracture of the specimens.Among them,the initial cracks located in the middle of the fillet weld at the end of the stiffener have a more significant impact on the mechanical properties of joints.