爆破地震荷载作用下建筑结构的动力响应分析

建筑结构在爆破地震荷载作用下的动力响应,是爆破安全设计和建筑物防护的重要依据。以某次爆破工程实测地震波为基准输入参量,采用ANSYS/LS-DYNA构建数值分析模型,分析了4层建筑结构在不同爆破震动速度和主频下的动力响应特性。结果表明:结构的振动速度和位移均随爆破震动速度的增大而增大,结构底部的应力和应变高于上部,结构各部分振动速度随高度的增加具有不同程度的放大作用;爆破震动主频与结构固有频率越接近,结构物的振幅就越大。

Dynamic Response Analysis of Building Structure under Blasting Seismic Loads

The dynamic response of building structure under blasting seismic loads is an important basis for the blasting safety design and building protection. Taking a monitored blasting seismic wave as input parameter,and u-sing ANSYS/ LS-DYNA to build numerical analysis model,the dynamic response characteristics of a four-story build-ing structure at different blasting vibration velocity and the main frequency were analyzed. The results show that the vibration velocity and the displacement of the structure increased with the blasting vibration velocity increasing;the stress and strain at the structure bottom was higher than the upper's;the structure vibration velocity increased with height increasing with different amplification degrees;more close to blasting vibration frequency and the natural fre-quency of structure,the greater amplitude of structure would be obtained.