人字形支撑与横梁板式连接节点滞回试验的数值模拟

Hysteretic Test Simulation of Inverted V-Brace and Their Gusset Plate Connections

支撑板式连接节点是铰接钢架节点的重要连接形式,它直接影响着框架支撑结构体系的抗震性能。采用ANSYS有限元软件对9个工字型截面人字形支撑板式连接节点试件的滞回性能试验进行了数值模拟。在验证有限元结果与试验结果较好吻合的同时,研究了支撑轴线交点位置、支撑端部净距和节点板厚度等重要参数对支撑体系的承载力、滞回耗能性能和节点板等效塑性应变的影响规律,所得结论可为板式连接节点的设计与应用提供依据。

Gusset plate connection commonly applied in structural engineering has a great influence on the seismic performance of a braced frame. By use of ANSYS program,the numerical simulation of hysteretic tests of 9 frames are carried out,in which the inverted V-braces with I sections and their gusset plate connections to beams are used. The great agreement of simulation results and test results shows the numerical models employed can be used to explore the more detailed behaviors of these test specimens which are affected by some key parameters,such as the clearance at the brace end on the gusset plate, locations of the intersection point of bracing members, and the gusset plate thickness. Accordingly, the loading capacities and dissipated energy of braced systems,and equivalent plastic strain on gusset plates influenced by these key parameters are studied,and the results can be used in design.