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Damage to primary structural members reduces story stiffness and, in severe cases, changes the mode shape of frames, introducing structural irregularity that is a critical factor for damage assessment. This paper presents an investigation to clarify the changes in vertical stiffness distribution caused by damage and examine the effectiveness of a rapid repair process. The study used the test data of a full-scale shaking table test of a four-story steel frame representing a hospital facility with a weak-base/strong-column design conducted in 2020. The relationship between the damage states of the structure and the structural characteristics including natural frequency, mode shapes, and stiffness was evaluated by system identification. Using a numerical model of the specimen, a widely-used repair method that rapidly reverts the column base's overall stiffness was proven effective through the subsequent analyses.

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Identification and Reparation of Seismic Damage Induced Irregularity of Steel Frames with Weak-Base/Strong-Column Design

  • 会议论文

  • 发表日期：

    2025年

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  • Kun-Sian Lin,
  • Masahiro Kurata,
  • Tafu Kawamoto,
  • Shintaro Matsuo,
  • Didier Pettinga

摘要

Damage to primary structural members reduces story stiffness and, in severe cases, changes the mode shape of frames, introducing structural irregularity that is a critical factor for damage assessment. This paper presents an investigation to clarify the changes in vertical stiffness distribution caused by damage and examine the effectiveness of a rapid repair process. The study used the test data of a full-scale shaking table test of a four-story steel frame representing a hospital facility with a weak-base/strong-column design conducted in 2020. The relationship between the damage states of the structure and the structural characteristics including natural frequency, mode shapes, and stiffness was evaluated by system identification. Using a numerical model of the specimen, a widely-used repair method that rapidly reverts the column base's overall stiffness was proven effective through the subsequent analyses.