高层建筑动力灾害模拟分析(Ⅰ)——爆破所致建筑倒塌对相邻建筑的破坏研究

Simulation and analysis of dynamic disaster of high rise building(Ⅰ): damage of building caused by blasting of adjacent building

为了解超高层建筑因爆破所致的倒塌或倾倒过程对周围建筑产生的破坏情况,使用基于颗粒流理论的PFC^(3D)作为模拟平台对该过程进行模拟。构建了A、B两栋结构相同、高度不同的超高层建筑,其相距30m。模拟分为三种工况(爆破点炸药量为10~6J、10~7J、10~8J),在其它条件不变情况下模拟了在A建筑爆破后倾倒或坍塌对B建筑的影响。模拟结果表明:当爆破药量为10~6J时,两建筑碰撞后B建筑先于A建筑坍塌,分别历经是72s和520s;当爆破药量为10~7J时,A建筑与B建筑历经84s后完成坍塌,这两种药量使建筑A均产生倾倒,在实际的过程中应避免。当爆破药量为10~8J时,可以完全破坏核心筒,便会产生对周围建筑最有利的A建筑坐塌破坏,进而减少对周围建筑的影响。

In order to understand the high rise building damage caused by the collapse or dumping process of the surrounding buildings after blasting,the damage process is simulated based on PFC^(3D).High rise buildings(A and B)are constructed with the same structure,but their heights are different,the distance between them is 30m.The simulation is divided into three kinds of working conditions(explosive equivalent is 10~6J、10~7J、10~8J).With other conditions unchanged,the influence of dumping or collapse of building A to building B is simulated.Simulation results show that:when the explosive equivalent is 10~6J,the building B collapsed before A after two building collision,respectively after 72s and 520s.When the explosive equivalent is 10~7J,the two buildings collapse after84s.Each of the above two explosive equivalents makes the building A dumping,so they should be avoided.When the explosive equivalent is 10~8J,it can damage the core completely.It will produce the most favorable collapse of building A to the surrounding building,thus reduce the influence on surrounding buildings.