中文摘要：

根据火灾不同时刻波纹腹板钢梁温度的变化,考虑火灾高温对结构弹性模量的影响,分析了火灾高温作用下波纹腹板钢梁的三种不同剪切屈曲模式和弹性屈曲临界应力的变化,给出了火灾高温作用下波纹腹板钢梁的局部剪切弹性临界屈曲应力、总体屈曲模式的弹性临界屈曲应力、弹性相关屈曲的临界应力的计算表达式,算例分析表明：火灾高温对波纹腹板钢梁的弹性剪切临界屈曲应力的变化有着显著的影响。

英文摘要：

According to the temperature change of a steel corrugated web beam in fire at different moments,3 kinds of shear buckling modes and variation of elastic critical buckling stress of the beam in fire are analyzed,with the effect of high temperature on steel elastic modulus being taken into account.The computed expressions of elastic critical shear local buckling,general buckling and relevant buckling stresses of the beam in fire are presented in the paper.Numerical results show that high temperature due to fire has obvious effect on elastic critical shear buckling stress of steel corrugated web beams.