A periodic foundation with rotational oscillators for extremely low-frequency seismic isolation: analysis and experimental verification

作者：Huang, Jiankun^*; Shi, Zhifei; Huang, Weixin; Chen, Xinhua; Zhang, Zhiwei

来源：Smart Materials and Structures, 2017, 26(3): 035061.

DOI：10.1088/1361-665X/aa5dd1

• periodic foundation
• typical cell
• attenuation zone
• seismic isolation

A new type of periodic foundation (PF) with rotational oscillators was developed, and its locally resonant attenuation feature was analyzed numerically and experimentally. The proposed PF was composed of a concrete matrix in which local resonators consisting of steel cores with rubber linkers were attached. Finite element method was employed to comprehensively investigate influences of material and geometrical parameters on the attenuation zones. Furthermore, a scaled PF was fabricated and shake tests were performed. The locally resonant mechanism within the rotational resonator can produce extremely low-frequency wave-forbidding capability. The results demonstrated that a PF can isolate seismic waves with frequencies lower than 10 Hz, sufficient to serve as a seismic isolation foundation for civil engineering structures. This kind of foundation system opens up new perspectives for the development of seismic isolation foundations for low-frequency applications.

• 出版日期2017-3
• 单位清华大学; 北京交通大学; 北京建筑大学; 北京林业大学