阻尼效应的振动台模型试验研究

Shaking Table Test on Damping Effect

设计并进行了10层框架的模型振动台试验,分别进行了低频、中频、高频地震波模型试验.根据模型试验结果,应用不同模型试验数据分析方法——自由振动衰减、半功率法和HHT变换法,得出了模型结构前3阶自振频率及对应的振型阻尼比;再分别采用Rayleigh阻尼假定和Caughey阻尼假定,进行了相应模型结构地震反应的数值模拟,比较了不同阻尼模型之间的差异;较为详细地描述了根据试验结果作出较为合理的数值模拟的过程.

A ten-story frame model was designed for shaking table test.Tests were made under low frequency,medium frequency and high frequency respectively. The first three natural frequency and corresponding model damping ratio were obtained.Then on the basis of the free vibration attenuation,half-power spectrum method and HHT（Hilbert-Huang Transform） method. A corresponding numerical simulation by the model test was made with Rayleigh and Caughey damp assumption.Results of different damping models were compared.A detailed illustration for a more reasonable simulation based on the experiment results was presented.