爆破地震动作用下砌体结构动力响应的现场实测与数值模拟研究

Field measurement and numerical simulation of dynamic response of masonry structure under blasting ground motion

以江苏省昆山市朝阳西路南侧两栋楼房的爆破项目为工程背景,对爆破过程中产生的地震动及其效应,包括地震波的传播与衰减规律以及振动对邻近区域内一座三层砌体结构房屋安全性能的影响,进行现场测试,并采用有限元软件SAP2000进行数值模拟分析。测试结果表明,砌体结构房屋的竖向振动速度大于水平向振动速度,三层走廊的各向振动速度大于一层,竖向主振频率大都集中在10Hz以下,水平向主振频率相对分散,但基本不超过50Hz。经有限元数值模拟分析得到的低阶自振频率与顶层加速度值与实测的结果误差较小。

Taking the blasting project of two buildings on the south side of Chaoyang West Road in Kunshan City, Jiangsu Province as the engineering background, the ground motion and its effect in the blasting process were tested on site, including the propagation and attenuation of earthquake wave and the influence of vibration on the safety performance of a three-story masonry structure in the adjacent area, and the numerical simulation analysis was carried out by using the finite element software SAP2000. The test results show that the vertical vibration speed of masonry buildings is greater than the horizontal vibration speed, and the vibration speed of three-story corridor is greater than that of one story. The vertical main vibration frequency is mostly concentrated below 10 Hz, and the horizontal main vibration frequency is relatively scattered, but it is basically no more than 50 Hz. The errors between the low-order natural frequency and the top acceleration obtained by the finite element numerical simulation and the measured results are small.