截面温度不均匀对受约束波纹腹板梁火灾下悬链线效应的影响-《建筑科学与工程学报》

文章信息/Info

Title:: Effects of Non-uniform Temperature Distribution Across Section on Catenary Action of Restrained Corrugated Web Beam in Fire

Author(s):: WANG Pei-jun, LIU Chang-bin, YANG Zhen-min; School of Civil Engineering, Shandong University

Keywords:: corrugated web beam; axially restrained steel beam; fire; non-uniform temperature distribution; catenary action

摘要:: 以受约束波纹腹板梁为研究对象，利用有限元模型进行了截面温度均匀和不均匀分布对轴向约束波纹腹板梁悬链线效应影响的对比分析。结果表明：由于不均匀温度下产生的热弯曲效应，约束钢梁在受压阶段的竖向挠度更大而梁内轴力更小；均匀温度受约束钢梁的临界温度比不均匀温度钢梁高6.2%；不均匀温度钢梁的温度比越小，钢梁的热弯曲效应越明显，相应的临界温度越低。

Abstract:: The restrained corrugated web beam was taken as research object, and the influences of uniform and non-uniform temperature distribution across section on catenary actions of axially restrained corrugated web beam were analyzed by using the finite element model. The results show that due to the thermal bending effect produced by the nonuniform temperature, the vertical deflection of the restrained steel beam is larger at the compression stage, and the axial force in beam is smaller. The failure temperature of the steel beam with uniform temperature is 6.2% higher than that of the steel beam with nonuniform temperature. The smaller the temperature ratio is, the more obvious the thermal bending effect of steel beam is, and the lower the failure temperature is.