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作者:

Liu, Juan (Liu, Juan.) | Zhang, Jianwei (Zhang, Jianwei.) (学者:张建伟) | Zhao, Zuozhou (Zhao, Zuozhou.)

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摘要:

To investigate the influence of using high-strength steel bars in columns on the seismic resistance capacity and seismic resilience of frame structures, seismic fragility evaluation of three 8-story reinforced concrete (RC) frame structures was conducted based on the incremental dynamic analysis (IDA) using 11 ground motion records. The main parameter is the longitudinal reinforcement configuration in the frame columns, where the first structure is reinforced with HRB 600 grade steel bars in the columns, the second structure is replaced with equal area ultra-high-strength (UHS) steel bars (i.e., with a yield strength of approximately 1425 MPa), and the third structure is replaced with equal strength UHS steel bars. A numerical model of the RC frame structure was developed and then validated using previous experimental results. The exceeding probabilities at various performance limit states were calculated based on two typical engineering demand parameters (EDPs) of maximum interstory drift and residual interstory drift. The results showed that using UHS longitudinal steel bars instead of HRB 600 grade steel bars in frame columns could reduce the energy dissipation capacity of the structure, inevitably leading to an increase in the maximum interstory response of the frame. However, much lower exceedance probability was observed in the UHS-enhanced frame under the repair available limit state based on the residual interstory drift, indicating that the UHS-enhanced RC frame had higher seismic resilience. In addition, compared to equal area substitution, equal strength substitution is a more ideal design method that can use fewer UHS steel bars to achieve comparable reparability and a smaller increase in maximum interstory drift.

关键词:

seismic resilience frame structure finite element model high-strength steel bars seismic fragility evaluation high-strength concrete

作者机构:

  • [ 1 ] [Liu, Juan]Tsinghua Univ, Dept Civil Engn, Beijing, Peoples R China
  • [ 2 ] [Zhao, Zuozhou]Tsinghua Univ, Dept Civil Engn, Beijing, Peoples R China
  • [ 3 ] [Zhao, Zuozhou]Tsinghua Univ, Key Lab Civil Engn Safety & Durabil, China Educ Minist, Beijing, Peoples R China
  • [ 4 ] [Zhang, Jianwei]Beijing Univ Technol, Key Lab Urban Secur & Disaster Engn, Minist Educ, Beijing 100084, Peoples R China

通讯作者信息:

  • 张建伟

    [Zhang, Jianwei]Beijing Univ Technol, Key Lab Urban Secur & Disaster Engn, Minist Educ, Beijing 100084, Peoples R China

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来源 :

STRUCTURAL DESIGN OF TALL AND SPECIAL BUILDINGS

ISSN: 1541-7794

年份: 2024

期: 10

卷: 33

2 . 4 0 0

JCR@2022

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