城市高层框架-筒体结构建筑物拆除数值模拟研究

Numerical Simulation of Explosive Demolition of Urban High-steered Frame-tube Structures

城市高层框架-筒体建筑大多处在建筑密集的场所,环境复杂,对爆破拆除提出很高要求。南昌五湖大酒店拆除爆破的工程实例中,为减小楼房同时倒塌产生的振动危害效应,采用多段延时起爆技术,使楼房分三段依次塌落。利用ANSYS/LS-DYNA有限元程序对采取定向控制爆破的框架-筒体楼房塌落过程进行了数值模拟,楼房实现了定向塌落,触地后发生纵向断裂和局部破碎,与实际爆破效果相符合。数值模拟方法对于分析建筑物的倒塌模型、预测倒塌过程以及更好的指导爆破拆除施工有较好的帮助,具有显著的工程应用价值。

The high-steered frame-tube structures are mostly in places with a high density of buildings and com- plex circumstance,So,there are higher requirements for the demolishing of it. In the case of Nanchang Wuhu hotel explosive demolition,in order to reduce the vibration effect, the delay initiation technique was adopted to make the hotel collapsed in sequence for three sections. The orientation collapse process was simulated by using ANSYS/LS- DYNA. The hotel collapse in specific direction and crack in longitudinal direction and break in local part were in ac- cording to the actual blasting effetely well. Numerical simulation is useful to analysis the collapse model, forecasting the collapse process and guiding engineering practice, which is valuable to engineering application.