高耸建筑物爆破定向倾倒运动风荷载的数值模拟

Numerical Simulation of Motional Wind Load on High Building in Its Directional Collapse by Blasting

通过对高耸建筑物爆破中风荷载的影响特点进行分析,借助有限元软件ANSYS,通过数值计算,得出运动风荷载主要影响的部位是高耸建筑物筒体的顶部,筒体倾转时,顶部有折断"甩"出的可能。烟囱倾转的角加速度会影响筒体在风载作用下的受力响应,要控制烟囱倾转角加速度,应控制好爆破切口支撑部的破坏速度。

The characteristics of wind load in blasting demolition of high building were analyzed. After the numerically calculating with the finite element software ANSYS,it was found that motion wind load mainly influence the stress in the top part of chimney, the top part maybe break and be thrown off in directional tnrning of chimney body. In addition, the angular acceleration of directional turning would influence the stress response of the top part of chimney under wind load, so the angular acceleration should be controlled by controlling the breaking velocity of the blasting cut.