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介绍均布荷载下,外包石膏板的钢管混凝土槽钢一侧受火时的屈曲性能的数值研究。研究包括三个阶段,即热传导分析、前屈曲分析和屈曲分析。通过二维有限元分析法进行热传导分析,从而获得槽钢梁的温度场。通过伯努利梁理论并考虑温度对应变和力学性能的影响来进行前屈曲分析。结合有限条分析法和傅里叶级数解决方案进行屈曲分析,其力学性能受温度影响很大。结果显示,腹板和受火的翼缘、边缘都有明显的温度变化。此外,截面温度变化的梁与截面温度恒定均匀的梁的屈曲性能不同。
A numerical study of the buckling behavior of concrete-filled steel tubular channel with fire under uniform load is presented. The study includes three phases, namely, thermal conduction analysis, pre-buckling analysis and buckling analysis. Through the two-dimensional finite element analysis of heat conduction analysis, to obtain the temperature field of the channel beam. Pre-buckling analysis is performed by Bernoulli beam theory and considering the effect of temperature on strain and mechanical properties. Buckling analysis with finite strip analysis and Fourier series solution has great influence on mechanical properties due to temperature. The results showed that there was a significant temperature change at the edges of the webs and fire-affected flanges. In addition, the beams with different cross-sectional temperature and the beams with uniform cross-sectional temperature have different buckling properties.