Attenuation characteristics and isolation performance of one-dimensional periodic foundation

被引：0
|
作者：
Zhao C. [1 ,2 ]
Zeng C. [1 ]
Witarto W. [3 ]
Mo Y.L. [3 ]
机构：
[1] School of Civil Engineering, Hefei University of Technology, Hefei
[2] Anhui Key Laboratory of Civil Engineering Structures and Materials, Hefei University of Technology, Hefei
[3] Department of Civil and Environmental Engineering, University of Houston, Houston
来源：
| 1600年 / Science Press卷 / 41期
关键词：
Attenuation zone; Base isolation; Dynamic response; One-dimensional periodic foundation; Shaking table test;
D O I：
10.14006/j.jzjgxb.2020.S2.0010
中图分类号：
学科分类号：
摘要：
There are certain frequency band gaps in periodic materials. The frequency band gap has a selective transmission effect on elastic waves, which cannot pass through the periodic materials when the main frequency is filled in the frequency band gaps. Thus, it can provide new methods for seismic isolation, vibration isolation noise reduction, wave elimination and thermal insulation design and development in engineering structures. Based on Bloch-Floquet theory, the dispersion relationship of periodic materials was theoretically derived, and the frequency band gap of periodic materials was provided. The reactor building numerical model and scaled model with one-dimensional layered periodic foundation and reinforced concrete foundation were established, and the dynamic responses and filtering effects of periodic foundation and reinforced concrete foundation reactor building were investigated through the shaking table test by means of sine wave sweep frequency and seismic wave input, respectively. The results show that there is a frequency band gap in the one-dimensional periodic foundation, which can block the seismic waves pass through the foundation when the main frequency filled in the range of the frequency band gap. The periodic foundation can provide about 90% isolation effect and does not increase the relative displacement of the structure. On the contrary, the reinforced concrete foundation amplifies the dynamic response of the structure without any reduction. Therefore, the periodic foundation can be used for base isolation and vibration reduction of engineering structures by adjusting the width of the frequency band gap covering the main frequency band of seismic waves. © 2020, Editorial Office of Journal of Building Structures. All right reserved.
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页码：77 / 85
页数：8
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