矩形钢管混凝土的局部屈曲性能研究

本文用能量法对刚性基底矩形钢板的屈曲性能进行了理论分析研究,利用满足边界条件的屈曲位移函数得到屈曲系数的计算公式,然后进一步用于矩形钢管混凝土轴心受压局部屈曲问题的分析和计算,得到矩形钢管混凝土屈曲系数计算公式,最后根据修正的温特(G.Winter)公式,推导矩形钢管混凝土全截面有效的宽厚比限值及其局部屈曲强度计算公式,计算结果与试验结果进行了比较,吻合较好。本文的研究成果可为相关研究提供参考。

Research on the Buckling Behaviour of Concrete Filled Steel Tubes with Rectangular Sections

A theoretical study on the buckling behaviour of concrete filled steel RHS was carried out in this paper.An energy method was used to establish an eigenvalue problem,and by buckling deformation function,which satisfy all the restrained boundary conditions,the explicit solution of plate local buckling coefficient was obtained.Formulation of local buckling coefficient was used to analyse plates of concrete filled steel box columns with rectangular section subjected to axial compression,and the formula of local buckling coefficient k was obtained.The limitation of width thickness ratio and formulate local buckling strength of concrete filled steel tubes with rectangular section were presented.Comparisons between calculated results and those measured from tests were carried out,and good agreements were achieved.The conclusions in this paper may be referred for relevant research.