梁端翼缘扩翼型节点抗震性能分析

针对梁端翼缘扩翼型节点抗震性能,在试验研究基础上通过建立有限元分析模型衍生设计了2组16个试件,采用Ansys有限元分析方法深入探讨了梁端翼缘扩翼型节点的扩大宽度、扩大长度等参数对节点极限荷载、延性性能等抗震性能影响.根据试验及有限元模拟的试件破坏结果,对容易导致节点断裂发生的薄弱环节的开裂可能性进行了评估,通过引入等效塑性应变指数,从理论上分析了梁端翼缘扩翼型节点的断裂机理.介绍了梁端翼缘扩翼型节点扩翼参数的设计方法.

Seismic Characteristics of Widened Beam Flange Joints

In order to analyze the seismic behavior of widened beam flange joints, 16 specimens were derived from finite element models base on experiments. The effects of some parameters, such as the increased width and length, on ultimate load and ductility performance of joints were further discussed with ANSYS finite element method. According to specimen failure phenomenon of both experiment and finite element method, the weak link of the joints was found and the cracking possibility was evaluated. A theoretical analysis of the fracture mechanism of widened beam flange connection was conducted. In addition, design method of widened beam flange parameters was introduced, which will offer valuable information and reference for seismic design in steel frame joints.