ABAQUS在结构连续倒塌数值模拟中的应用

Application of ABAQUS in numerical simulation of structural progressive-collapse

以某超限高层结构为例,基于ABAQUS/Explicit方法对结构在地震作用下连续倒塌的数值模拟方法进行了研究,开发了适用于模拟倒塌分析中纤维梁单元的混凝土和钢筋/钢材材料子程序。基于混凝土损伤模型实现模拟墙板壳单元的刚度退化,通过截面点“生死”模拟纤维梁单元失效,并同时考虑倒塌过程中单元的碰撞接触。通过不同幅值的强震记录对结构进行了连续倒塌模拟,从纤维梁单元应力.应变时程曲线、结构整体响应和倒塌过程等方面对结构倒塌性能进行了分析和评估,验证了模拟方法的合理性,为结构进一步的性能设计提供了依据,并为相关研究提供参考和思路。

Take one out-of-code high-rise building as the background,a numerical simulation method of structural progressive-collapse under earthquake was studied based on ABAQUS/Explicit method,subroutine on material of concrete and steel which applied to fiber beam element in progressive-collapse simulation were developed.Based on the concrete damage model,the simulation of the stiffness degradation of the wall and floor shell element was realized,the failure of the fiber beam element was simulated through the section point "life and death"and at the same time the collision contact of the unit during the collapse process was also considered.The continuous collapse simulation of the structure was carried out by strong earthquake records with different amplitudes.The collapse performance of the fiber beam element was analyzed and evaluated from the aspects of stress-strain time history curve,overall structural response and collapse process.The rationality of the simulation method was analyzed and verified,which provides a basis for further performance design of the structure and provides reference and ideas for related research.