Field experimental investigation on broadband vibration mitigation using metamaterial-based barrier-foundation system
Field experimental investigation on broadband vibration mitigation using metamaterial-based barrier-foundation system
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DOI：
10.1016/j.soildyn.2022.107167
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发表时间：
2022-04
影响因子：
4
通讯作者：
Benchen Zhang;Hsuan-Wen Huang;F. Menq;Jiaji Wang;K. Nakshatrala;K. Stokoe;Y. Mo
中科院分区：
文献类型：
--
作者：
Benchen Zhang;Hsuan-Wen Huang;F. Menq;Jiaji Wang;K. Nakshatrala;K. Stokoe;Y. Mo
周期性障碍物和周期性基础都可以用作被动隔震措施，以减少影响被保护上部结构的不利振动。在一定的激励方向下，由于这些地下结构的不同取向，由周期性屏障和周期性基础提供的频带隙通常是可区分的。本研究通过一系列的现场试验来评估周期性屏障和周期性基础的组合使用，以达到更好的隔浪效果。本研究中所使用的周期性屏障与周期性基础皆为一维层状周期性材料。使用最先进的液压移动的振动筛（T-Rex），可以在所需位置的所有三个正交方向上施加具有各种类型输入信号的激励。运动传感器的布置允许记录地面和受保护上部结构在所有三个方向上的响应。分别讨论了周期屏障和周期基础的频率响应函数（FRF）屏蔽效果，并对周期屏障和周期基础组成的系统的隔波性能进行了综合评价。结果表明，周期性屏障和周期性基础的滤波能力是互补的，两者的联合使用有利于被保护上部结构的减振。
Both periodic barriers and periodic foundations can be used as passive isolation measures to reduce the unfavorable vibrations affecting the protected superstructure. Under a certain direction of excitation, the frequency band gaps provided by the periodic barriers and periodic foundations are usually distinguishable due to the different orientations of these subsurface structures. In this study, a series of field tests are conducted to assess the combined usage of the periodic barrier and periodic foundation in a manner to achieve better wave isolation effect. Both periodic barrier and periodic foundation used in this study are made of one-dimensional (1-D) layered periodic material. Using the state-of-art hydraulic mobile shaker (T-Rex), the excitation with various types of input signals can be applied in all the three orthogonal directions at the desired location. The arrangement of motion sensors allows for recording the response of the ground surface and the protected superstructure in all the three directions. The screening effectiveness, quantified as Frequency Response Function (FRF), of the periodic barrier and periodic foundation are discussed separately, followed by an overall evaluation of the wave isolation performance of the system composed of both periodic barrier and periodic foundation. The results show that the filtering capability of the periodic barrier and the periodic foundation is complementary to each other, and the combined usage of the periodic barrier and the periodic foundation is beneficial to mitigating the vibration of the protected superstructure.