非均匀高温条件下高腹板工字梁剪切极限强度分析

Ultimate shear resistance of steel plate girders at non-uniform elevated temperatures

高腹板工字梁结构广泛应用于大型邮轮等船舶与海洋结构物,在现行的欧洲钢结构规范中,对工字梁在高温条件下抗剪极限强度计算方法未充分计及高温环境的影响。本文通过非线性隐式动力分析方法,对高腹板工字梁抗剪极限强度进行数值模拟,并与实验结果进行对比,验证了数值解的合理性。同时针对非均匀温度场,文中考虑了三种不同高温场景,通过数值模拟具体指出了欧洲规范的不足之处,并提出了适用于非均匀高温场的工字梁剪切极限强度改进计算方法,为工字梁结构设计与高温安全性评估提供了参考。

I-girders with high webs are widely used in ship and ocean structures.According to Eurocode 3,specifications for ultimate shear resistance of steel plate girders do not take full account of impacts due to elevated temperatures.In this paper,ultimate shear resistances of I-girders with high webs were computed by nonlinear implicit dynamic method and validated with experiment results.Aiming at non-uniform temperature situations,this paper considered three different temperature distributions and detailed the inadequacy of Eurocode 3.An improved method to predict the shear resistance of steel plate girders at non-uniform elevated temperatures was also presented,which provides a reference for structural design and safety assessment of I-girders under shear load at elevated temperatures.