Investigation of seismic performance of LRB base-isolated structures subjected to extremely rare earthquakes

被引：0

作者：

Zhu H. ^{[1
]}

Tan P. ^{[2
]}

Ye K. ^{[1
]}

机构：

[1] College of Civil Engineering and Mechanics, Huazhong University of Science and Technology, Wuhan

[2] Earthquake Engineering Research & Test Center, Guangzhou University, Guangzhou

来源：

Jianzhu Jiegou Xuebao/Journal of Building Structures | 2019年 / 40卷 / 10期

关键词：

Base-isolated building structure; Design earthquake; Elasto-plastic time-history analysis; Extremely rare earthquake; LRB; Rare earthquake; Seismic performance;

D O I：

10.14006/j.jzjgxb.2017.0851

中图分类号：

学科分类号：

摘要：

It is well accepted that base-isolated structure has excellent seismic performance subjected to design and rare earthquakes. With the introduction of extremely rare earthquake into GB 18306-2015 'Seismic ground motion parameters zonation map of China', it is necessary to investigate the seismic performance of base-isolated structures subjected to extremely rare earthquakes. In this study, a LRB base-isolated structure is modelled by a two-degree-of-freedom-system (simplified model) and a multi-degree-of-freedom-system (fiber model). Based on the numerical results from nonlinear time history analysis, the influences of yielding strength of the superstructure (i.e., reducing the seismic fortification intensity of the superstructure) and mechanical parameters of the LRB isolation system on the seismic performance of the LRB base-isolated structure have been investigated. It is indicated that it is not feasible to design isolated superstructures by reducing the seismic fortification intensity if the extremely rare earthquake is under consideration. Moreover, in order to ensure the safety of the isolated superstructure and LRB isolation bearing, it is necessary to use the LRB isolation bearings with large diameter and low rubber shear modulus. Finally, how to simultaneously ensure the safety of LRB base-isolated structures under design, rare and extremely rare earthquakes is still a challenging problem. © 2019, Editorial Office of Journal of Building Structures. All right reserved.

引用

页码：122 / 131

页数：9

共 20 条

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