半刚接钢框架结构抗竖向连续倒塌动力响应分析

Dynamic response analysis of semi-rigid steel frame structures resisting vertical progressive collapse

基于向量式有限元建立半刚接钢框架结构模型,考虑初始变形,采用将构件拆除前后的静力分析和动力分析全过程统一的瞬时卸载法.通过对一平面半刚接钢框架结构进行动力非线性分析,研究底层不同柱失效后剩余结构抗竖向连续倒塌动力响应,对比不同节点转动刚度对钢框架结构抗倒塌性能的影响.结果表明,节点转动刚度对钢框架结构抗竖向连续倒塌影响较大,因此在研究钢框架结构抗竖向连续倒塌时有必要考虑梁柱真实连接刚度.

Based on vector form intrinsic finite element (VFIFE), a model of semi-rigid steel frame structure is constructed. Considering initial deformation condition the transient unloading method is used to analyze the integration of static and dynamic analysis before and after the component is removed. Through the dynamic nonlinear analysis of a plane semi-rigid steel frame structure, the dynamic response is studied for the residual structure resisting vertical progressive collapse after the failure of different columns in the bottom floor, and influence of different node rotational stiffness on collapse resistance of the steel frame structure is compared. The results show that the node rotational stiffness has a great influence on the vertical progressive collapse of the steel frame structure. Therefore, it is necessary to consider the true connection stiffness of beams and columns in the study of the vertical progressive collapse of steel frame structures.