Three dimensional periodic foundations for base seismic isolation
Three dimensional periodic foundations for base seismic isolation
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DOI：
10.1088/0964-1726/24/7/075006
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发表时间：
2015-07-01
影响因子：
4.1
通讯作者：
Shi, Z.
中科院分区：
文献类型：
--
作者：
Yan, Y.;Cheng, Z.;Shi, Z.
本文从声子晶体的概念出发，研究了由周期性材料构成的周期性基础。周期性地基可以提供低频带隙，其覆盖地震波的主要频率范围。因此，周期性基础能够在地震事件期间保护上部结构。本文研究了三维周期基础的基本理论，并采用有限元法进行了敏感性分析。通过对简化的带上部结构的三维周期基础进行现场试验，证明了三维周期基础的可行性。试验结果表明，在主频率落在衰减区的激励波作用下，具有三维周期基础的上部结构的响应有所减小。有限元分析结果与试验结果吻合较好，表明三维周期基础是一种可行的减震方法。
Based on the concept of phononic crystals, periodic foundations made of periodic materials are investigated in this paper. The periodic foundations can provide low frequency band gaps, which cover the main frequency ranges of seismic waves. Therefore, the periodic foundations are able to protect the upper structures during earthquake events. In this paper, the basic theory of three dimensional periodic foundations is studied and the finite element method was used to conduct the sensitivity study. A simplified three-dimensional periodic foundation with a superstructure was tested in the field and the feasibility of three dimensional periodic foundations was proved. The test results showed that the response of the upper structure with the three dimensional periodic foundation was reduced under excitation waves with the main frequency falling in the attenuation zones. The finite element analysis results are consistent with the experimental data, indicating that three dimensional periodic foundations are a feasible way of reducing seismic vibrations.