随机行走激励楼盖振动加速度反应谱

Acceleration Response Spectrum for Predicting Floor Vibration Under Stochastic Crowd Load

采用蒙特卡罗法生成大量移动的随机单人步行荷载曲线,在此基础上计算得出1000条竖向加速度均方根响应的反应谱曲线,并生成标准反应谱曲线模型。从实际工程入手,通过3个现场实测楼盖工程案例,验证标准反应谱曲线计算方法的可靠性,将标准反应谱法计算的理论值与现场最不利工况测试的响应结果、有限元方法计算的理论值进行对比,结果吻合。标准反应谱法有助于获悉引起结构响应的主振型以及最大响应处的位置,对结构减振控制起到参考作用。所建议的反应谱方法可用于计算随机步行荷载作用下大跨楼盖的加速度响应。

Quantities of stochastic walking curves are generated with Monte-Carlo method,and 1 000 rootmean-square acceleration response spectrum in the vertical vibration direction of the test floor is calculated.Actual projects are studied to verify the results using response-spectrum method,and three cases of floor construction are adopted in this paper.The results of the measuring points using response-spectrum method are compared with other measuring values under the most unfavorable conditions and the theoretical values calculated by finite element method,which are all consistent.The method is helpful to obtain the position of response and to discover the main vibration mode which causes the structural maximum response,and it is also useful for the structural vibration control.The suggested spectrum-based approach can be used for the acceleration response of large span floor under a stochastic walking load.