防灾减灾工程学报2025，Vol.45Issue(5)：1098-1109,1150,13.DOI:10.13409/j.cnki.jdpme.20240705003
高强钢约束柱受火后剩余承载性能实用评估方法
Practical Assessment Method for Post-fire Residual Bearing Capacity of Restrained High Strength Steel Columns
摘要
Abstract
Determining the post-fire residual bearing capacity of restrained high strength steel columns is crucial for the post-fire safety assessment of high strength steel structures.A validated finite element model was used to conduct a systematic parametric analysis of the post-fire residual bearing capacity of restrained high strength steel columns,considering the effects of maximum fire temperature,slender-ness ratio,axial restraint stiffness ratio,rotational restraint stiffness ratio,load ratio,load eccentricity,and high strength steel grade and manufacturing process.The results showed that when the maximum fire temperature of the restrained steel column was lower than the temperature corresponding to its maximum axial bearing capacity,the heating and cooling process during the fire had little effect on the residual bearing capacity.Beyond this point,the residual bearing capacity decreased as the maximum fire temperature increased.Under certain circumstances,restrained steel columns with medium slender-ness ratios experienced more severe reductions in post-fire residual bearing capacity,and the degree of reduction decreased with an increase in the axial restraint stiffness ratio,load ratio,and load eccentricity.The rotational restraint stiffness ratio affected the residual bearing capacity by influencing the slender-ness ratio of the steel column.The reduction degree of post-fire residual bearing capacity of the re-strained QT Q890 high strength steel columns was usually the smallest.Based on the results of the para-metric analysis and the provisions of current standards,a practical assessment method for the post-fire residual bearing capacity of restrained high strength steel columns was proposed.This method included a simplified calculation approach for determining the post-fire residual bearing capacity,along with conditions and classifications for the continued use of high strength steel columns after fire exposure.关键词
高强钢约束柱/受火后/剩余承载性能/参数分析/实用评估方法Key words
restrained high strength steel column/post-fire/residual bearing capacity/parametric analysis/practical assessment method分类
建筑与水利引用本文复制引用
宋林昕,李国强,Wang Y C..高强钢约束柱受火后剩余承载性能实用评估方法[J].防灾减灾工程学报,2025,45(5):1098-1109,1150,13.基金项目
国家自然科学基金项目(51878506)资助 （51878506）
