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In order to explore the crack development, deformation capacity, failure mode and progressive collapse mechanism of the frame under the failure of the bottom side column, a progressive collapse test and theoretical analysis were conducted on a two-story two-span precast prestressed concrete frame. The results show that the structural loading stages include the beam mechanism stage and the collapse stage during the failure of the side column. In the small deformation stage, the structure follows the beam mechanism and exhibits compression arch effect and vierendeel action. In the large deformation collapse stage, the structure does not follow the catenary mechanism and the unbalanced load can be resisted by the bending mechanism and vierendeel action. Concrete cracking and failure were concentrated at the beam-column nodes on both sides of the frame beams adjacent to the failed side column, and the damage to the beam-column nodes of the bottom frame was more serious. The other columns and the beams away from the failed columns were basically intact. Then according to the control section of structural failure and the critical collapse state of the specimen, the computation methods of the collapse resistance and the critical displacement were proposed, respectively.

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Performance and Mechanism of Prestressed Fabricated Concrete Frame to Resist Progressive Collapse with a Side Column Failure

  • 会议论文

  • 发表日期：

    2025年

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  • Manrong Song,
  • Xiaolong Chen,
  • Jiaxuan He,
  • Jingfeng Wang,
  • Ruixue Cao,
  • Yuwei Jin,
  • Shenjiang Huang,
  • Bingkang Liu

摘要

In order to explore the crack development, deformation capacity, failure mode and progressive collapse mechanism of the frame under the failure of the bottom side column, a progressive collapse test and theoretical analysis were conducted on a two-story two-span precast prestressed concrete frame. The results show that the structural loading stages include the beam mechanism stage and the collapse stage during the failure of the side column. In the small deformation stage, the structure follows the beam mechanism and exhibits compression arch effect and vierendeel action. In the large deformation collapse stage, the structure does not follow the catenary mechanism and the unbalanced load can be resisted by the bending mechanism and vierendeel action. Concrete cracking and failure were concentrated at the beam-column nodes on both sides of the frame beams adjacent to the failed side column, and the damage to the beam-column nodes of the bottom frame was more serious. The other columns and the beams away from the failed columns were basically intact. Then according to the control section of structural failure and the critical collapse state of the specimen, the computation methods of the collapse resistance and the critical displacement were proposed, respectively.