周期性隔震基础的理论与实验研究进展

Theoretical and experimental studies of periodic foundations

经合理设计,具有低频衰减域的周期性基础可用于抑制地震动向上部结构传播。本文简要介绍了一维、二维及三维周期性隔震基础的理论及实验研究成果。首先,分别介绍了应用传递矩阵法、傅里叶级数法和有限单元法计算的一维、二维及三维周期性基础的频散关系,从中得到相应的衰减域。其次,分别介绍了一维、二维及三维周期性基础模型的相关实验情况。研究结果表明,周期性隔震基础具有显著的隔震效果。

With proper design,periodic foundations with low-frequency attenuation zones can be used to isolate seismic waves. This paper reports theoretical and experimental studies results of one-,two- and three-dimensional periodic foundations. First,using the transfer matrix method,Fourier expansion method and Finite elements methods,dispersion curves of infinite one-,two and three dimensional periodic structures are obtained,respectively,from which frequency attenuation zones are found. Second,small modals for one-,two-,and three-dimensional periodic foundations are designed and fabricated. Shake table tests and free-field tests are conducted to verified the effectiveness of periodic foundations. It is proved that periodic foundations can isolate seismic waves effectively.