长周期地震波作用下超高层结构连续倒塌数值模拟

Progressive-collapse numerical simulation of super high-rise structure subjected to long period ground motion

基于ABAQUS软件对某超高层结构在长周期地震波作用下的连续倒塌数值模拟方法进行研究。采用纤维梁单元模拟框架梁和框架柱,采用壳单元模拟钢筋混凝土剪力墙和楼板。基于子程序实现梁单元材料积分点材料的失效用于模拟单元生死,基于混凝土弹塑性损伤本构近似模拟钢筋混凝土剪力墙与楼板的刚度削弱及失效,并采用单元接触考虑倒塌过程中单元之间的碰撞和结构碎片堆积情况。以某实际超高层结构为例,分析了结构的动力特性,并对该超高层结构在长周期地震波作用下的破坏模式和倒塌过程进行了模拟,可为超高层结构地震破坏机理和抗震设计研究提供参考。

The progressive-collapse numerical simulation method of a super high-rise structure subjected to long period ground motion was studied based on ABAQUS. Frame beams and columns were modeled by fiber beam elements, while reinforced concrete shear walls and slabs were simulated by shell elements. Element death and birth were simulated by the failure of integral point materials of beam element materials based on subroutine. Stiffness degradation and failure of reinforced concrete shear walls and slabs were approximately simulated through the concrete damaged plasticity model. Element contact was also considered to simulate collision and structure fragments accumulation in collapse. Taking a super high-rise structure as an example, the dynamic characteristics were analyzed. Failure mode and progressive-collapse process of the structure subjected to long period ground motion were simulated. The proposed method can provide reference for seismic damage mechanism study and seismic design of super high-rise building.