离心钢管混凝土弯扭组合作用承载力三维数值相关分析

Finite Analysis on Centrifugal Concrete-Filled Steel Tubes under Bending and Torsion

通过三维有限元模型来模拟现场试验及结构在工程实际中的情况,对离心钢管混凝土结构在弯扭组合作用下的力学性能进行了全过程的分析；并将计算值与试验值进行了对比,发现两者的吻合程度很好。在此基础上对该结构在承受弯扭组合作用下的弹塑性变形性状,和结构强度与刚度的非线性变化机理进行了分析。提出了离心钢管混凝土在弯扭组合下的弹性极限承载力相关方程,为工程设计和应用提供了依据。也为进一步对该结构在复杂应力状态下的力学性状的三维模拟分析提供了参照依据。

To imitate centrifugal concrete-filled steel tubes used in real structures, three-dimension models were built up by finite element method. The mechanical performance of centrifugal concrete-filled steel tubes under bending and torsion was studied. It was showed that the result by this method was almost the same as that of experiments. And the elastic and plastic performance of this structure under bending and torsion including the nonlinear change of strength and stiffness was analyzed. A correlate equation about elastic and plastic bearing capacity of this structure under bending and torsion was deduced .This article provides a reference to further study on this structure under complex stresses by using three-dimension modeling method.