Simplified Collapse‑Prevention Assessment Method for Steel Low‑Ductility Concentrically Braced Frames

Yihe LIU; Zhiqian DONG; Gang LI

doi:10.13409/j.cnki.jdpme.202003023

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Simplified Collapse‑Prevention Assessment Method for Steel Low‑Ductility Concentrically Braced Frames

更新时间：2025-09-25

- Simplified Collapse‑Prevention Assessment Method for Steel Low‑Ductility Concentrically Braced Frames
- Journal of Disaster Prevention and Mitigation Engineering Vol. 42, Issue 1, Pages: 135-141(2022)
- 作者机构：
  
  大连理工大学海岸和近海工程国家重点实验室，辽宁大连 116024
- 作者简介：
- 基金信息：
- DOI：10.13409/j.cnki.jdpme.202003023
  CLC： TU391;TU317.1
- Published：28 February 2022
- 稿件说明：
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刘一赫,董志骞,李钢.低延性支撑钢框架结构抗倒塌性能简化评估方法[J].防灾减灾工程学报,2022,42(01):135-141.

LIU Yihe,DONG Zhiqian,LI Gang.Simplified Collapse‑Prevention Assessment Method for Steel Low‑Ductility Concentrically Braced Frames[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(01):135-141.
刘一赫,董志骞,李钢.低延性支撑钢框架结构抗倒塌性能简化评估方法[J].防灾减灾工程学报,2022,42(01):135-141. DOI： 10.13409/j.cnki.jdpme.202003023.

LIU Yihe,DONG Zhiqian,LI Gang.Simplified Collapse‑Prevention Assessment Method for Steel Low‑Ductility Concentrically Braced Frames[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(01):135-141. DOI： 10.13409/j.cnki.jdpme.202003023.

摘要

为量化不同设计参数条件下低延性中心支撑框架结构的抗倒塌能力，基于增量动力分析方法，计算了单自由度中心支撑钢框架结构在不同地震强度作用下的反应，分析了储备承载力、储备刚度、结构周期、强度折减系数等设计参数对低延性结构抗倒塌性能的影响。根据计算结果，建立了不同参数条件下低延性中心支撑钢框架结构的倒塌富裕度计算公式，提出了基于该公式的结构抗倒塌性能简化评估方法，通过算例验证了该方法的适用性与准确性，为此类结构抗倒塌设计提供参考。

Abstract

In order to quantify the collapse resistance of the low-ductility concentrically-braced frame （CBF） structure under different design parameters， this paper calculates the structural vulnerability under different earthquake loads based on the incremental dynamic analysis （IDA） method and analyzes the influence of design parameters such as reserve capacity， reserve stiffness， structural period， and response modification factor. According to the calculation results， the fitted formulas of the collapse margin ratio of the low-ductility CBF under different parameters are proposed， and a simplified method for evaluating the collapse-prevention capacity of the CBF structure based on the proposed formula is established. This method can quickly quantify the collapse performance of the low-ductility CBF. The applicability of this method is verified by a numerical example. Results show that the proposed method is accurate and applicable. It can be used for the collapse-prevention capacity evaluation and design of the CBF structure.

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references

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