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作者:

Shen, Jiaxu (Shen, Jiaxu.) | Zhang, Yongqun (Zhang, Yongqun.) | Chen, Jun (Chen, Jun.)

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EI Scopus SCIE

摘要:

An unreinforced masonry (URM) structure damaged by a strong earthquake may be threatened by subsequent aftershocks in an unrepaired state. However, there is no consensus regarding whether aftershocks must be considered in the design and retrofitting of URM structures. This study aimed to comprehensively evaluate the seismic performance and explore the collapse mechanism of URM structures subjected to sequential ground motions. Therefore, a refined numerical model of a 5-story URM structure was established and verified using experiments. Fifteen as-recorded sequential ground motions were screened from several databases. By employing the incremental dynamic analysis approach for mainshocks and aftershocks separately, 900 samples of nonlinear structural responses under different sequential ground motions were obtained. The inter-story drift ratio (IDR) and damage index (DI) were adopted to assess the vulnerability of the URM structure. Moreover, the entire process from the cracking to collapse of a URM structure was simulated to investigate the collapse mechanism caused by aftershocks. The results indicated that a strong aftershock poses a significant threat to the URM structure, and the probability of severe damage and collapse increases significantly. The influence of strong aftershocks on the URM structure is more significant in the DI-based vulnerability assessment than in the IDR-based one. A strong aftershock significantly aggravates the damage to parts previously damaged by the mainshock and has less impact on the undamaged parts. We conclude that a strong aftershock should be considered in the design and retrofitting of URM structures.

关键词:

Unreinforced masonry structures Vulnerability assessment Sequential ground motions Macro-modeling strategy Collapse simulation

作者机构:

  • [ 1 ] [Shen, Jiaxu]Beijing Univ Technol, Fac Architecture Civil & Transportat Engn, Beijing, Peoples R China
  • [ 2 ] [Shen, Jiaxu]Tongji Univ, Coll Civil Engn, Dept Struct Engn, Shanghai, Peoples R China
  • [ 3 ] [Chen, Jun]Tongji Univ, Coll Civil Engn, Dept Struct Engn, Shanghai, Peoples R China
  • [ 4 ] [Zhang, Yongqun]Shanghai Res Inst Bldg Sci, Shanghai Key Lab Engn Struct Safety, Shanghai, Peoples R China

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来源 :

BULLETIN OF EARTHQUAKE ENGINEERING

ISSN: 1570-761X

年份: 2022

期: 15

卷: 20

页码: 8151-8177

4 . 6

JCR@2022

4 . 6 0 0

JCR@2022

ESI学科: GEOSCIENCES;

ESI高被引阀值:38

JCR分区:1

中科院分区:2

被引次数:

WoS核心集被引频次: 12

SCOPUS被引频次: 13

ESI高被引论文在榜: 0 展开所有

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