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作者:

Jia, Kemin (Jia, Kemin.) | Xu, Chengshun (Xu, Chengshun.) (学者:许成顺) | El Naggar, M. Hesham (El Naggar, M. Hesham.) | Zhang, Xiaoling (Zhang, Xiaoling.) | Cui, Chunyi (Cui, Chunyi.) | Du, Xiuli (Du, Xiuli.)

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Scopus SCIE

摘要:

In this paper, we study the seismic behavior of pile group bridges in inclined liquefiable soil and reveal the failure mechanism by conducting large-scale shaking table tests. Two bridge models were supported by two foundations: a group pile in an inclined liquefiable site and a rigid foundation. Typical results of the model test under a strong event (Tabas 0.3 g) are illustrated, and the effects of soil-group pile-bridge interaction are explored. The inertial and kinematic effects of the pile-pier curvature are evaluated, and the seismic failure mechanisms of the pile-bridge system are revealed. The results demonstrated that the near-pile shallow soil exhibited significant shear dilation response during the occurrence of strong earthquakes, which induced acceleration spikes for both soil and structure. The interaction state was soil pushing the pile and pile pushing the soil during the first and the subsequent strong earthquake, respectively, due to the bridge P-Delta effect. The liquefaction-induced lateral spreading increased the kinematic effect and reduced the inertial effect on the pile head curvature. In addition, the inertial effect on the pile curvature decreased gradually from the shallow layer to the middle of liquefiable soil, while the kinematic effect increased gradually. The results also demonstrated that the rigid foundation assumption overestimated the acceleration demand of the bridge during strong earthquakes; however, it seriously underestimated the lateral displacement. Finally, the lateral spreading shifted the vulnerable position of the pile group-pier system from the pier bottom to the pile head and bottom, and the leading piles sustained more damage than the trailing piles.

关键词:

Lateral spreading Soil-pile bridge interaction Liquefaction Seismic failure mechanism Shake-table test Pile group

作者机构:

  • [ 1 ] [Jia, Kemin]Beijing Univ Technol, Minist Educ, Key Lab Urban Secur & Disaster Engn, Beijing 100124, Peoples R China
  • [ 2 ] [Xu, Chengshun]Beijing Univ Technol, Minist Educ, Key Lab Urban Secur & Disaster Engn, Beijing 100124, Peoples R China
  • [ 3 ] [Zhang, Xiaoling]Beijing Univ Technol, Minist Educ, Key Lab Urban Secur & Disaster Engn, Beijing 100124, Peoples R China
  • [ 4 ] [Du, Xiuli]Beijing Univ Technol, Minist Educ, Key Lab Urban Secur & Disaster Engn, Beijing 100124, Peoples R China
  • [ 5 ] [Jia, Kemin]Western Univ, Dept Civil & Environm Engn, London, ON N6A 5B9, Canada
  • [ 6 ] [El Naggar, M. Hesham]Western Univ, Dept Civil & Environm Engn, London, ON N6A 5B9, Canada
  • [ 7 ] [Cui, Chunyi]Dalian Maritime Univ, Transportat Engn Coll, Dalian, Peoples R China

通讯作者信息:

  • 许成顺

    [Xu, Chengshun]Beijing Univ Technol, Minist Educ, Key Lab Urban Secur & Disaster Engn, Beijing 100124, Peoples R China

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来源 :

INTERNATIONAL JOURNAL OF GEOMECHANICS

ISSN: 1532-3641

年份: 2024

期: 3

卷: 24

3 . 7 0 0

JCR@2022

被引次数:

WoS核心集被引频次: 2

SCOPUS被引频次: 2

ESI高被引论文在榜: 0 展开所有

万方被引频次:

中文被引频次:

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