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结构连续倒塌大多由柱失效引起,而框架结构中边柱断裂失效后悬链机制发展不充分,更易引起上部结构局部坍塌,引发构件之间的接触-碰撞,甚至导致结构整体倒塌。对强震下边框架柱激发失效的接触-碰撞响应进行动力时程分析,分析中将主从节点建模技术应用于Open SEES分析模型,运用约束处理法计算考虑构件突然失效时的动力效应,采用非线性Hertz-damp模型对边跨坍塌行为进行碰撞力学建模,程序中产生的机构通过构件移除来实现。利用外部的MATLAB程序调用Open SEES求解器计算得到的数据来计算碰撞力,并将其作为反作用力作用于Open SEES中的主结构模型,计算碰撞力和地震动联合作用下损伤结构的动力响应。研究发现:边柱断裂后引起的局部机构对下部梁的剧烈冲击可能导致下部结构的破坏,考虑接触-碰撞行为后,结构的水平位移、竖向位移、失效路径甚至倒塌模式都有显著的变化。
The continuous collapse of the structure is mostly caused by column failure. However, the catenary mechanism is not fully developed after the failure of the side columns in the frame structure. It is more likely to cause local collapse of the superstructure and cause contact-collision between the components and even collapse of the structure as a whole. The dynamic time-history analysis of the contact-collision response of frame columns under strong earthquakes was performed. The main and subordinate node modeling techniques were applied to the Open SEES analysis model, and the constraint effect method was used to calculate the dynamic effect of sudden failure of components. The nonlinear Hertz-damp model models crash mechanics for side-span collapse behavior, and the mechanism generated in the procedure is achieved by component removal. The external MATLAB program calls the data calculated by the Open SEES solver to calculate the impact force, which is used as the reaction force in the main structure model in Open SEES to calculate the dynamic response of the damage structure under the combined impact force and ground motion. It is found that the violent impact of the local structure on the lower beam caused by the edge column fracture may lead to the destruction of the substructure. After considering the contact-collision behavior, the horizontal displacement, the vertical displacement, the failure path and even the collapse pattern of the structure have significant changes .