建筑钢结构进展2025，Vol.27Issue(10)：59-68,78,11.DOI:10.13969/j.jzgjgjz.20240516003
双肋式波形钢腹板工字钢组合连续梁耐火性能研究
Study on Fire Resistance of Double-Ribbed I-Steel Continuous Composite Girder with Corrugated Steel Webs
摘要
Abstract
To investigate the fire resistance of double-ribbed I-steel continuous composite girder with corrugated steel webs under different fire scenarios,a fire test of a continuous double-ribbed steel-concrete composite girder is taken as a background,and the finite element software ANSYS is used to establish a coupled thermal-force numerical model of the composite girder.The temperature rise law of the composite girder under fire,and the structural deformation and failure modes under different fire scenarios are analyzed.Furthermore,the influence of load ratio,span-to-height ratio,and the variation of the web corrugation angle on the fire resistance of the composite girder is studied.The results show that when subjected to fire,the temperature rise rate of double-ribbed I-steel continuous composite girder with corrugated steel webs along the height of the cross section is not consistent,forming a significant temperature gradient.The structural deformation and fire resistance time of the composite girder subjected to different fire scenarios have large differences,and the closer the fire area is to the middle support,the shorter the fire resistance time of the composite girder will be.The fire in the middle support area is a more unfavourable condition for the girder,with shorter fire resistance time and local buckling damage.Load ratio has a significant effect on the fire resistance of the composite girder subjected to fire at the side support area,and the fire resistance time decreases by 54.4%when the load ratio is increased from 0.3 to 0.5.Reducing the span-to-height ratio significantly improves the fire resistance of the girder subjected to fire in the side support and mid-span areas,but the fire resistance times of the girder subjected to different fire scenarios are relatively close.The variation of the web corrugation angle has a smaller impact on the fire resistance of the composite girder subjected to different fire scenarios,and the fire resistance times are close,which is basically negligible.The research results can provide a certain reference for the fire-resistant design of double-ribbed I-steel continuous composite girder with corrugated steel webs.关键词
桥梁工程/波形钢腹板/组合梁/有限元分析/温度场/耐火性能Key words
bridge engineering/corrugated steel web/composite girder/finite element analysis/temperature field/fire resistance分类
交通工程引用本文复制引用
郑尚敏,刘伟良..双肋式波形钢腹板工字钢组合连续梁耐火性能研究[J].建筑钢结构进展,2025,27(10):59-68,78,11.基金项目
国家自然科学基金(52068025),江西省自然科学基金项目(20242BAB25309),江西省交通运输厅项目(2024YB021) （52068025）
