Study on fragility functions of H-shaped steel columns

ZHENG Shangsuo; ZHAO Wang; YANG Song; LI Yongming; LIU Liguo

doi:10.11835/j.issn.2096-6717.2025.101

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Study on fragility functions of H-shaped steel columns

更新时间：2025-10-31

- Study on fragility functions of H-shaped steel columns
- Journal of Civil and Environmental Engineering Pages: 1-11(2025)
- 作者机构：
  
  1.西安建筑科技大学，土木工程学院，西安 710055
  2.西安建筑科技大学，结构工程与抗震教育部重点实验室，西安 710055
- 作者简介：
  
  ZHENG Shansuo (1960- ), professor, doctorial supervisor, main research interests: structural engineering and seismic research in engineering, E-mail: zhengshansuo@263. net.
- 基金信息：
  
  National Natural Science Foundation of China(52278530);Key R & D Projects in Shaanxi Province(2021ZDLSF06-10)
- DOI：10.11835/j.issn.2096-6717.2025.101
  CLC： TU375.4
- Received：14 May 2025，
  
  Online First：31 October 2025，
- 稿件说明：
移动端阅览
郑山锁,赵旺,杨松等.H型钢柱易损性函数研究[J].土木与环境工程学报,

ZHENG Shangsuo,ZHAO Wang,YANG Song,et al.Study on fragility functions of H-shaped steel columns[J].Journal of Civil and Environmental Engineering,
郑山锁,赵旺,杨松等.H型钢柱易损性函数研究[J].土木与环境工程学报, DOI：10.11835/j.issn.2096-6717.2025.101.

ZHENG Shangsuo,ZHAO Wang,YANG Song,et al.Study on fragility functions of H-shaped steel columns[J].Journal of Civil and Environmental Engineering, DOI：10.11835/j.issn.2096-6717.2025.101.

摘要

H型钢柱是钢框架结构的关键构件，其基于性能的抗震评估至关重要。易损性函数是抗震评估的核心工具，但国内尚未建立符合中国规范的H型钢柱易损性函数。整合94组H型钢柱低周反复荷载试验数据，以位移角为工程需求参数，根据损伤特征将损伤状态划分为3级并制定相应修复措施，提取对应不同损伤等级的位移角限值。基于FEMA P-58方法建立易损性函数，并讨论轴压比、截面等级与抗震等级对易损性函数的影响。结果表明：损伤状态提升将显著提高H型钢柱易损性函数中位值，易损性曲线呈现出右移的趋势；轴压比增大会加速塑性铰形成，加剧承载力退化，从而降低中位值；截面宽厚比减小可延缓局部屈曲，显著提升中位值；而结构抗震等级越高，H型钢柱宽厚比限值越严格，发生破坏时对应的位移角越大；随着损伤状态的提升，轴压比对易损性曲线差的影响逐渐增大，而截面等级对易损性曲线差的影响逐渐减小，截面等级对易损性曲线的影响程度显著高于轴压比。

Abstract

H-shaped steel columns are critical components in steel frame structures

necessitating performance-based seismic assessment. Fragility functions-cumulative distribution functions reflecting the probability of engineering demand parameters (EDP) exceeding damage thresholds-are pivotal but lack codified frameworks compliant with Chinese standards. This study integrates 94 global low-cycle reversed loading test datasets for H-shaped steel columns

adopting drift ratio as the EDP. Three damage states are classified based on structural degradation patterns

with tailored repair strategies

and extracted the displacement angle limits corresponding to different damage levels. Fragility functions conforming to lognormal distribution are established using the FEMA P-58 methodology. The effects of axial compression ratio and cross-section classification are analyzed. Key findings: Elevated damage states significantly increase fragility function medians

the Fragility curve exhibits a rightward shift trend; Higher axial compression ratios accelerate plastic hinge formation and strength degradation

reducing medians; Reduced cross-section width-to-thickness ratios delay local buckling

enhancing medians; The higher the seismic grade due to stricter width to thickness ratio limits

the greater the displacement angle corresponding to the failure of H-shaped steel columns

As the damage state increases

the influence of axial compression ratio on the difference in vulnerability curve gradually increases

while the influence of section grade on the difference in vulnerability curve gradually decreases

cross-section classification outweighs axial compression ratio in influencing fragility curves.

关键词

Keywords

references

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