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为对矩形钢管混凝土柱热屈曲的影响因素进行分析,假定矩形钢管混凝土柱非加载边和加载边都固定,柱子不受外力只受高温作用,选择满足四边固定边界条件的屈曲位移函数后利用能量法求得热屈曲系数,进一步得到热屈曲变温的表达式,最后分析了长宽比、宽厚比等参数对热屈曲变温的影响.结果表明:纵向热屈曲荷载和常温屈曲荷载存在线性关系;当长宽比在1~2.5时,长宽比对屈曲变温T的影响较大;随着宽厚比增大,屈曲变温减小.
In order to analyze the factors that affect the thermal buckling of concrete-filled rectangular CFST columns, assuming that both the unloaded side and the loaded side of rectangular CFST columns are fixed, the columns are not subject to external forces and only subjected to high temperature. After selecting the buckling displacement function that satisfies the four-boundary fixed boundary conditions, The thermal buckling coefficient is obtained and the expression of thermal buckling temperature is obtained. Finally, the effects of aspect ratio, aspect ratio and other parameters on the thermal buckling temperature are analyzed. The results show that there is a linear relationship between the longitudinal buckling load and room temperature buckling load. When the aspect ratio is between 1 and 2.5, the aspect ratio has greater influence on the buckling temperature T; as the aspect ratio increases, the buckling temperature decreases.