基于分离式共节点模型的建筑物定向倾倒切口数值模拟研究

摘要

利用有限元Ansys/ls-dyna对建筑结构爆破拆除的定向倒塌进行模拟,利用分离式共节点模型对抚顺大酒店的爆破拆除进行数值模拟,通过对单根柱子的数值模拟进行研究,然后初步分析分离式共节点模型存在的问题,在大量数值模拟实验的基础上,找出钢筋失效应变的修正系数范围,就这种现象提出了三种可能.同时,基于重心失稳理论和经验公式理论,选取了多个切口高度进行定向倾倒研究,通过选取不同的切口高度进行大量的数值模拟实验,在数值计算结果分析的基础上,得出"楼坚强"形成的主要原因是切口高度不够的结论.%The finite element Ansys/ls-dyna is used to simulate the directional collapse of building structure blasting demoli-tion. The separated common-node model is used to perform the numerical simulation of Fushun Hotel blasting demolition. The nu-merical simulation of simple root is studied. And then the problems existing in separated common-node model are analyzed in preliminary. On the basis of plenty of numerical simulation experiments,the range of correction factor of the rebar failure strain is found out,and three possibilities for this phenomenon are proposed. On the basis of barycenter unstability theory and empiri-cal formula,the heights of multiple incisions are selected to research the directional collapse. The heights of different incisions are selected to perform the massive numerical simulation experiments. On the basis of the analysis of numerical calculation re-sult,it is concluded that the main reason of the erect building is the insufficient incision height.