建筑结构学报2026，Vol.47Issue(2)：31-43,13.DOI:10.14006/j.jzjgxb.2025.0176
火灾后钢-混凝土组合梁疲劳性能与疲劳寿命评估方法研究
Post-fire fatigue behavior and life prediction method for steel-concrete composite beams
摘要
Abstract
To investigate the evolution law of fatigue performance of steel-concrete composite beams after fire exposure,stud shear tests and composite beam tests under sustained loading,heating,natural cooling,and subsequent fatigue loading were conducted to analyze the variation characteristics of the shear performance of stud bolts and the fatigue behavior of composite beams under different post-fire temperatures.The results indicate that the stud shear performance deteriorates with the increasing temperature.At 450 ℃,the shear capacity decreases to approximately 83％of its initial value,while the ultimate slip reduces to 60％.Fire exposure is also found to significantly alter the fatigue damage mechanism,as evidenced by increased mid-span deflections and enlarged slip at the steel-concrete interface in the shear span.Based on a validated finite element model,the post-fire mechanical response was further simulated,leading to the development of an empirical model for the stud stress concentration factor and a fatigue life prediction method applicable to stud root temperatures below 450 ℃.Further analysis results show that when the fire exposure temperature is 400 ℃,the logarithmic fatigue life of the composite beam increases by approximately 57％.However,fatigue life remains highly sensitive to load amplitude,with higher load amplitudes leading to a more rapid reduction in fatigue life.关键词
钢-混凝土组合梁/剪切栓钉/火灾后/有限元分析/疲劳寿命Key words
steel-concrete composite beam/shear stud/post-fire/finite element analysis/fatigue life分类
建筑与水利引用本文复制引用
楼国彪,郑晓峰,王紫珮,朱劭骏,蒋亚强,钟波..火灾后钢-混凝土组合梁疲劳性能与疲劳寿命评估方法研究[J].建筑结构学报,2026,47(2):31-43,13.基金项目
国家自然科学基金项目(52378532,52208196),中央高校基本科研经费(22120240628). （52378532,52208196）
