华东交通大学学报2026，Vol.43Issue(2)：76-86,11.
火灾下波形钢腹板组合箱梁剪力滞效应研究
Study on Shear Lag Effect of Composite Box Girder with Corrugated Steel Webs Under Fire
摘要
Abstract
To analyze the effect of fire temperature gradient on shear lag effect of the corrugated steel web com-posite box girder,based on the energy variational method and combined with the temperature stress theory of steel-concrete composite beams,this paper deduces the theoretical analysis formula of shear hysteresis-effect of composite box beams with corrugated steel webs under fire temperature gradient,and establishes the thermal coupling numerical analysis model of composite box beams with ANSYS finite element software to verify the ap-plicability of the theoretical formula.The variation of shear lag effect of composite box girder with corrugated steel web under different fire time and load ratio is further analyzed.The error of the analytical solution,finite el-ement numerical solution and measured values of the shear lag effect of the composite box girder with corrugat-ed steel webs derived in this paper is less than 7%,which indicates the good applicability.Under fire,the shear lag effect of composite box girders is significant,and it becomes more pronounced as the temperature increases.The maximum shear lag coefficient λmax of the composite box girder increases first and then decreases with the in-crease in fire time.The shear lag effect of the composite beam decreases with the increase of load ratio.λmax is greater than that under normal temperature when the load ratio is 0.2 and 0.3,and less than normal temperature when the load ratio is 0.4.The research results can provide a reference for the analysis and calculation of the shear lag effect of corrugated steel web box girder under fire temperature gradient.关键词
波形钢腹板/组合梁/剪力滞效应/能量变分法/温度场/非线性温度梯度Key words
corrugated steel web/composite beam/shear lag effect/energy variational method/temperature field/nonlinear temperature gradient分类
交通工程引用本文复制引用
郑尚敏,赵贤齐..火灾下波形钢腹板组合箱梁剪力滞效应研究[J].华东交通大学学报,2026,43(2):76-86,11.基金项目
国家自然科学基金项目(52068025) （52068025）
江西省自然科学基金项目(20242BAB25309) （20242BAB25309）
江西省交通运输厅一般科技项目(2024YB021) （2024YB021）
