建筑物爆破拆除定向切口参量数值模拟研究

摘要

The numerical simulation of hotel blasting demolition was conducted,and the numerical calculation for the blasting demolition process of the main building was performed in the condition of six incisions height. The separated common node model is studied by means of the numerical simulation experiment of single upright,in which the reason of massive rebar fracturing is caused by automatic decrease of rebar strain failure. On the basis of the gravity center instability theory and empirical formula theory,the six⁃incision height is selected to research the directional collapse. The numerical calculation results show that the height of best incision is half of the gravity center height,at this moment,the building demolition can obtain the maximum ki⁃netic energy utilization.%针对酒店的爆破拆除进行了数值模拟，对6个切口高度条件下主楼的爆破拆除过程进行数值计算。通过单根立柱的数值模拟实验对分离式共节点模型进行研究，找出分离式共节点模型中钢筋大量断裂的源头为钢筋的失效应变自动降低。同时，基于重心失稳理论和经验公式理论，选取了6个切口高度进行定向倾倒研究。数值计算结果分析显示最佳切口高度为重心高度的一半，此时整个大楼的拆除可以获得最大的动能利用率。