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作者:

Zhang, Qiang (Zhang, Qiang.) | Han, Qiang (Han, Qiang.) (学者:韩强) | Wen, Jianian (Wen, Jianian.)

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Scopus SCIE

摘要:

The ageing effect in the life-cycle assessment should be considered for the high-strength steel structures constructed in corrosive environments and high-seismicity zones. Additionally, the structures can suffer multidimensional seismic excitations because of the spatial effect of ground motions. Therefore, this study aims to investigate the impact of different loading protocols on the mechanical properties of Q690 steel columns with Hsection during the whole life-cycle. Firstly, numerical methods considering time-varying corrosion process are used to simulate the ageing steel columns. After that, the nonlinear hysteretic behaviors of the ageing steel columns under different loading protocols are investigated. The factor of resistance degradation (the degree of degradation of ultimate resistance) is employed to quantify the effect of loading protocols on ageing steel columns. Finally, the biaxial ultimate interaction curve considering the ageing effect and a practical design process are proposed. The findings demonstrate that the steel columns exhibit different mechanical properties under various loading protocols, and the coupling direction of bi-directional displacement loads influences the degree of degradation of ultimate resistance. As service time increases, the factor of resistance degradation of steel columns gradually reduces by up to 40%. The proposed biaxial ultimate interaction curve has acceptable accuracy. These findings emphasize the importance of employing the unfavorable loading protocols in conducting the seismic design of the steel columns in different life-cycle stages.

关键词:

Life-cycle stages Loading paths Seismic performance Bi-directional cyclic loading Ageing effect H-section columns Corrosion

作者机构:

  • [ 1 ] [Zhang, Qiang]Beijing Univ Technol, Natl Key Lab Bridge Safety & Resilience, Beijing 100124, Peoples R China
  • [ 2 ] [Han, Qiang]Beijing Univ Technol, Natl Key Lab Bridge Safety & Resilience, Beijing 100124, Peoples R China
  • [ 3 ] [Wen, Jianian]Beijing Univ Technol, Natl Key Lab Bridge Safety & Resilience, Beijing 100124, Peoples R China
  • [ 4 ] [Wen, Jianian]CCCC Highway Bridges Natl Engn Res Ctr, Beijing 100088, Peoples R China

通讯作者信息:

  • [Wen, Jianian]Beijing Univ Technol, Natl Key Lab Bridge Safety & Resilience, Beijing 100124, Peoples R China;;

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来源 :

ENGINEERING STRUCTURES

ISSN: 0141-0296

年份: 2024

卷: 306

5 . 5 0 0

JCR@2022

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