突然开孔结构风致瞬态内压极值研究

Extreme value of wind-induced transient internal pressure of buildings suffering sudden opening

基于经典内压控制方程,对特定开孔时刻下的瞬态内压峰值响应进行了详细研究,分析孔口开启时间对结构瞬态内压峰值的影响。提出突然开孔结构瞬态内压极值的估算方法,并与精确算法进行对比。结果表明:门窗开启时刻的外压值越大,瞬态内压峰值越大,但两者最大值之间存在着一定的时差;瞬态内压极值与外压达极值时的瞬态内压峰值之间的比值可用放大因子G=1.17来描述;提出的极值计算方法能有效地估算突然开孔结构瞬态内压极值。

Peak values of wind-induced transient internal pressure response were studied in detail when a structure's doors/windows suddenly were broken based on the classical governing equation of internal pressure. The effects of opening time on the peak transient internal pressure were analyzed. The estimated method for extreme value of transient internal pressure of buildings suffering sudden opening was presented, it was compared with the accurate calculation method. The results showed that the larger the external pressure when a building's doors/windows suddenly open, the larger the peak value of the transient internal pressure; however, there is a time lag between the maximum external pressure and the peak transient internal pressure; an amplification factor (G=1.17) can be used to describe the ratio of the extreme value of transient internal pressure to the peak internal pressure response when the external pressure reaches its maximum value; the presented method can be effectively used to estimate the extreme value of transient internal pressure of a building suffering sudden opening. © 2017, Editorial Office of Journal of Vibration and Shock. All right reserved.