高耸建筑物爆破定向倾倒运动风载计算分析

CALCULATION AND ANALYSIS OF MOTION WIND LOAD CAUSED BY DIRECTIONAL COLLAPSE OF THE BLASTING HIGH BUILDING

目前,高耸建筑物爆破中风载荷影响以静力矩研究为主,忽略了风载的动力学特性.将风速和风载荷相互转换,得出高耸建筑物倾倒时形成运动风载荷的计算方法.通过对45m高砖烟囱的数值模拟,得出运动风载主要影响筒体的顶部,3/4高度以上为危险区,会促进倾倒顶部前冲,这与风载的静力学分析是迥然相反的.运动风载荷的计算方法可供高耸建筑物爆破设计参考.

With the implementation of the energy-saving and discharge reducing policy in China in recent years,more and more chimneys are required to be demolished.At present,the motion wind load caused by the directional collapse of a blasting high building is usually calculated based on the static moment ignoring the dynamic nature of the wind load.In this paper,the calculation method of the motion wind load is derived from the mutual conversion of the wind speed and the wind load.Numerical calculations of a 45m-high brick chimney under the motion wind load show that the motion wind load mainly influences the stress response of the top part of the chimney,above 3/4 height,which contain dangerous sections and may cause the forward rush of the top part.The results are not expected by the static moment analyses of wind load.The calculation method can be used for the high building blasting design.