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<p>This study proposes a comprehensive seismic retrofit strategy for a 24-story steel building originally designed according to the outdated seismic code (GB 50011-2001). The building suffers from structural deficiencies, including excessive torsional displacement, insufficient axial load-bearing capacity of columns, and the presence of weak-story mechanisms. In this retrofit, BRB were adopted to make the structure comply with the modern seismic code (GB 50011-2010). Through systematic analysis using the YJK structural software, BRB were arranged at the mid-spans in the Y-direction of the structure. The results verified that the BRB system enhances the lateral stiffness of the structure while maintaining its architectural functionality. Compared with the base isolation alternative, it reduces the construction cost. Moreover, the structure can meet the requirements of GB 50011-2010 without disrupting its normal operation. This work establishes a reference framework for cost-effective seismic retrofitting of high-rise buildings.</p>

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Seismic retrofit of high-rise buildings using buckling-restrained braces: design methodology and performance evaluation

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年7月29日

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  • Shengzhi Shi,
  • Li Xin,
  • Chao Huang,
  • Gangqi Han,
  • Zhaodong XU,
  • Xinyu Chen

摘要

This study proposes a comprehensive seismic retrofit strategy for a 24-story steel building originally designed according to the outdated seismic code (GB 50011-2001). The building suffers from structural deficiencies, including excessive torsional displacement, insufficient axial load-bearing capacity of columns, and the presence of weak-story mechanisms. In this retrofit, BRB were adopted to make the structure comply with the modern seismic code (GB 50011-2010). Through systematic analysis using the YJK structural software, BRB were arranged at the mid-spans in the Y-direction of the structure. The results verified that the BRB system enhances the lateral stiffness of the structure while maintaining its architectural functionality. Compared with the base isolation alternative, it reduces the construction cost. Moreover, the structure can meet the requirements of GB 50011-2010 without disrupting its normal operation. This work establishes a reference framework for cost-effective seismic retrofitting of high-rise buildings.