Research and Design of Main Failure Modes of Seismically Isolated Structures Subjected to Very-rare Earthquakes

WU Peisong

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Research and Design of Main Failure Modes of Seismically Isolated Structures Subjected to Very-rare Earthquakes

更新时间：2025-09-25

- Research and Design of Main Failure Modes of Seismically Isolated Structures Subjected to Very-rare Earthquakes
- Issue 3, Pages: 317-325(2020)
- 作者机构：
  
  哈尔滨工业大学结构工程灾变与控制教育部重点实验室,黑龙江,哈尔滨,150090
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU352.1
- Published：2020
- 稿件说明：
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武沛松,王建,欧进萍.隔震建筑抗极罕遇地震能力与主要破坏模式分析∗[J].防灾减灾工程学报,2020,(3):317-325

WU Peisong. Research and Design of Main Failure Modes of Seismically Isolated Structures Subjected to Very-rare Earthquakes[J]. 2020, (3): 317-325.
武沛松,王建,欧进萍.隔震建筑抗极罕遇地震能力与主要破坏模式分析∗[J].防灾减灾工程学报,2020,(3):317-325 DOI：

WU Peisong. Research and Design of Main Failure Modes of Seismically Isolated Structures Subjected to Very-rare Earthquakes[J]. 2020, (3): 317-325. DOI：

摘要

隔震措施可以使上部结构在罕遇地震下处于弹性或轻微弹塑性状态

从而有效保护设防烈度下结构地震安全。但是，由于地震发生、强度和特性的不确定性，在设计基准期内结构也可能遭受极罕遇地震的作用，基于“大震不倒”设计的隔震结构在罕遇地震及极罕遇地震作用下隔震支座变形和结构整体抗倾覆安全以及实现抗极罕遇地震的能力和代价需要特别研究。本文通过弹塑性时程分析，比较三种不同高度的隔震结构层间位移角、叠层橡胶隔震支座位移及结构倾覆力矩，分析结构在极罕遇地震下隔震层（也即叠层橡胶支座）位移超限和整体倾覆的主要失效模式。结果表明：极罕遇地震下，基于“大震不倒”设计的隔震结构支座位移可能会超出限值，层间位移角和结构倾覆力矩通常可以满足要求。隔震支座尺寸适当增大、相应极限变形能力提高，能够控制极罕遇地震下结构隔震层变形破坏，但上部结构隔震效果有所下降；适当减小上部结构高宽比能够控制极罕遇地震下隔震结构、尤其高层隔震结构的整体倾覆破坏。因此，兼顾安全性和经济性，有效增大隔震支座极限位移、适当减小高层隔震结构高宽比，实现隔震建筑抗极罕遇地震能力，是付出代价不大、经济适用的一条有效途径。

Abstract

Superstructures of seismically isolated structure keep in elastic or slightly elastic-plastic range subjected to rare earthquakes

thereby protecting superstructure effectively. However

very-rare earthquakes may happen in design reference period due to uncertainty of earthquake intensity and character. On basis of “survive rare earthquakes by sustaining significant damage but without globally collapsing” design

horizontal deformation of isolation bearings and overturning resistance under very-rare earthquakes

performance and cost of seismically isolated structure based on “survive very-rare earthquakes” are worth researching. Dynamic responses of three seismically isolated structures with different heights are obtained from elastic-plastic time history analysis. Main failure modes of seismically isolated structures subjected to very-rare earthquakes are presented by comparing the responses such as inter-story drift ratios

horizontal displacements of isolation bearings and overturning moments. The results show that under very-rare earthquakes

horizontal displacements of isolation bearing in all three classic seismically isolated structures are excessive

while other two responses both meet the requirements. With isolation bearings increasing suitably

new structures can avoid destruction by deformation of isolation layer increasing and survive very-rare earthquakes

while isolation effectiveness reduce slightly. Reducing the aspect ratio of superstructure appropriately can control the overturning of whole structure especially high-rise structure subjected to very- rare earthquakes. Therefore

considering both safety and economy

it is an effective and economical way to increase the ultimate displacement of isolation bearing

appropriately reduce the aspect ratio of high-rise seismically isolated structures

and realize resistance ability of isolated buildings subjected to very-rare earthquake.

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references

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