轴心受压钢管混凝土柱局部屈曲理论分析  

Theoretical analysis of local buckling behavior about concrete filled steel tube column with axial compression

作　　者：蒋丽忠[1,2] 周旺保[1] 刘鹏[1] 

机构地区：[1]中南大学土木建筑学院,湖南长沙410075 [2]高速铁路建造技术国家工程实验室,湖南长沙410075

出　　处：《建筑结构学报》2011年第4期110-116,共7页Journal of Building Structures

基　　金：国家自然科学基金项目(51078355)

摘　　要：在核心混凝土为刚性基底假设基础上,利用薄壁圆管壳小挠度屈曲理论及满足边界条件的屈曲位移函数推导了在核心混凝土支承作用下圆钢管轴对称及非轴对称局部屈曲系数计算式;同时在考虑几何非线性及核心混凝土为刚性基底假设基础上,利用薄壁圆管壳大挠度变形理论推导了核心混凝土支承作用下圆钢管轴对称变形及非轴对称变形的荷载-挠度曲线关系,证明了在核心混凝土支承作用下圆钢管没有空钢管所具有的后屈曲荷载,说明由于核心混凝土的存在,圆钢管对初始缺陷不再敏感,指出了现有规程在验算圆钢管混凝土局部屈曲时沿用空钢管屈曲理论的计算方法的不合理性。Based on the hypothesis of core concrete being rigid basement,the calculation formulas of non axisymmetric and axisymmetric local buckling coefficient about the concrete-filled steel tube column were derived using the small deflection buckling theory of the thin wall circular tube-shell and the buckling displacement function meeting the boundary conditions.At the same time,on the basis of considering the geometric nonlinearity and the hypothesis of the core concrete being rigid basement,axisymmetric and non axisymmetric load-deflection curves were derived using large deflection deformation theory of thin wall circular tube-shell.The conclusions that the circular steel tube doesn′t have the later buckling load and the circular tube is no longer sensitive to initial imperfection because of the presence of the core concrete are proved.The unreasonableness of the calculation method in the current specifications that use the buckling theory of the hollow steel tube when checking and calculating the local buckling of the concrete-filled steel tube column is pointed out.

关 键 词：钢管混凝土柱 局部屈曲 径厚比 能量法 临界应力 

分 类 号：TU398.9[建筑科学—结构工程] TU312