大型振动台阵的振动影响实测研究

Site Test on Vibration Influence Induced by Large Scale Shaking Table Array

为研究某大型土木实验室内四点振动台阵正常运行所致的振动影响,对实验室内部和外部进行表面加速度的实地测试。测试内容主要分为两个时段,一是设备静止时段,二是设备运行时段,两个振动台满布刚性质量,最大加载质量接近60 T,施加1~40 Hz的多条正弦波激励,最大水平加速度0.5 g。根据室内外各测点的表面加速度振动衰减曲线的实测结果,得到了不同频率下的基础结构阻尼比,验证了大质量刚性基础减振方案的有效性。

In order to evaluate the effect of vibration induced by large scale shaking table array, site test on the ground vibration acceleration was done inside and outside the civil lab. Two conditions, as no table working and 2 tables working with sines input of different frequencies from 1 to 40 Hz and peak acceleration of 0.5 g are included. By vibration attenuation curve from the test result, the damping ratio of different frequency is got and the effectiveness of the large mass stiffness is also verified for vibration reduction.