Analytical Model for Progressive Collapse of Multi‑story RC Frame after a Ground‑story Middle Column Removal

LIN Kaiqi; LI Daoyuan; CAI Liang

doi:10.13409/j.cnki.jdpme.20230530001

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Analytical Model for Progressive Collapse of Multi‑story RC Frame after a Ground‑story Middle Column Removal

更新时间：2025-01-13

- Analytical Model for Progressive Collapse of Multi‑story RC Frame after a Ground‑story Middle Column Removal
- Journal of Disaster Prevention and Mitigation Engineering Vol. 44, Issue 6, Pages: 1299-1310(2024)
- 作者机构：
  
  1.福州大学土木工程学院，福建福州350116
  2.可持续与创新桥梁福建省高校工程研究中心，福建福州 350108
  3.福建省土木工程多灾害防治重点实验室，福建福州 350116
- 作者简介：
- 基金信息：
- DOI：10.13409/j.cnki.jdpme.20230530001
  CLC： TU398⁺.9
- Received：30 May 2023，
  
  Revised：2023-08-19，
  
  Published：15 December 2024
- 稿件说明：
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林楷奇,李道远,蔡亮.多层RC框架底层中柱失效连续倒塌计算模型[J].防灾减灾工程学报,2024,44(06):1299-1310.

LIN Kaiqi,LI Daoyuan,CAI Liang.Analytical Model for Progressive Collapse of Multi‑story RC Frame after a Ground‑story Middle Column Removal[J].Journal of Disaster Prevention and Mitigation Engineering,2024,44(06):1299-1310.
林楷奇,李道远,蔡亮.多层RC框架底层中柱失效连续倒塌计算模型[J].防灾减灾工程学报,2024,44(06):1299-1310. DOI： 10.13409/j.cnki.jdpme.20230530001.

LIN Kaiqi,LI Daoyuan,CAI Liang.Analytical Model for Progressive Collapse of Multi‑story RC Frame after a Ground‑story Middle Column Removal[J].Journal of Disaster Prevention and Mitigation Engineering,2024,44(06):1299-1310. DOI： 10.13409/j.cnki.jdpme.20230530001.

摘要

多层RC框架结构在底层中柱失效后，不平衡荷载由失效柱上方各楼层共同承担，其承载力相比单层框架会大幅提升。然而，由于缺乏系统的多层RC框架连续倒塌试验和数值模拟研究，失效柱上部各楼层的连续倒塌抗力机制尚不明确，既有研究中关于多层RC框架结构的抗连续倒塌承载力理论分析模型也十分有限。为此，首先依照中国规范设计了9座典型的RC框架结构，采用OpenSees开展了各框架在底层中柱失效时的连续倒塌分析，系统研究了各楼层梁的内力及应变分布，讨论了不同楼层的梁内连续倒塌抗力发展机制。在此基础上，结合单层RC框架梁柱子结构的连续倒塌承载力计算模型，依据各层梁的抗力贡献，建立了多层RC框架底层中柱失效的连续倒塌抗力计算模型，并与试验及数值模拟结果进行了对比验证。研究结果表明：①底层中柱失效后，多层RC框架首层梁存在显著的压拱机制和悬链线机制；②多层RC框架结构沿楼层高度方向布置不同尺寸构件时，截面尺寸变化的下部楼层梁会存在压拱受力机制；③除上述楼层外，其他楼层梁主要通过受弯机制提供连续倒塌抗力；④所提计算模型能较准确计算多层RC框架底层中柱失效时的抗连续倒塌承载力。

Abstract

In a multi-story RC frame

when the ground-story middle column fails

the unbalanced load is borne by the stories above the failed columns

and the load-carrying capacity is significantly increased compared to a single-story frame. However

due to the lack of systematic experimental and numerical investigations on the progressive collapse resistance of spatial multi-story RC frames

the force mechanisms of the stories above the failed column for resisting progressive collapse are still unclear. Moreover

there are few analytical models for quantifying the progressive collapse resistance of multi-story RC frame structures among existing studies. Therefore

9 typical multi-story RC frames are designed following the Chinese design codes and their progressive collapse behaviors under the ground-story middle column removal scenario are analyzed. The internal forces and strain developments of the beams on each story are systematically analyzed. And the progressive collapse-resisting mechanisms of various stories in an RC frame are discussed. On this basis

the calculation model of single-story RC beam-column substructures is combined to establish the analytical model for quantifying the progressive collapse resistance of a multi-story RC frame after the ground-story middle column removal

by calculating the resistance contributions of different stories. The experimental tests and numerical simulations are compared with the calculated results to verify the accuracy of the proposed model. The results show that: (1) Following the removal of the column

significant compressive arch action and catenary action are observed in the ground story beams. (2) When components of varying dimensions are arranged vertically within the RC frame

compressive arch action is observed in the lower floor beams that experience a change in component size. (3) Apart from the aforementioned floors

beams on other floors generally exhibit progressive collapse resistance through flexural actions. (4) The proposed analytical model can provide a satisfying estimation of the progressive collapse resistance of a multi-story RC frame under the ground-story column removal scenario.

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references

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