埋置基础扭转振动的实用化计算与试验的对比

Comparison of practical calculation for torsional vibration of embedded foundations and experiments

根据弹性半空间理论及基础振动试验和数值计算的最新成果,采用方程对等法推演出埋置块体基础扭转振动的实用化计算公式。在20 m×10 m×4 m土坑内采用摆锤分别对底面尺寸为0.5 m×0.5 m和1.0 m×0.5 m的埋置块体基础施加冲击荷载,使其发生扭转自由振动,并对其振动响应进行采集,将试验结果与采用实用化计算公式的计算结果进行了比较。该公式具有概念明确,计算简单的优点,对于任意形状,任意埋置状况的动力设备块体基础都适用,其结果对于结构工程的地震响应计算具有参考意义。

The practical calculation formulas for torsional vibration of embedded lump foundations were established based on the elastic half-space theory and state-of-the-art results of comprehensive experimental and numerical calculation by using equation equivalence method.Exerting impulsive load to embedded lump foundation of 0.5 m×0.5 m and 1.0 m×0.5 m with pendulum hammer to make foundations happen free torsional vibration in pit of 20 m×10 m×4 m respectively,collecting its vibration response,the results of experiment are compared to the results of calculation performed with practical calculation formulas.The advantages of the formulas are clear concept and simple calculation.It is practical for power equipment lumped foundation of arbitrarily shaped and arbitrarily embedded lumped foundations.It has referential significance to the calculation of seismic response of structural engineering.