脱空钢管混凝土偏心受压有限元分析

Nonlinear Finite Element Analysis of Eccentrically-Loaded Separate Concrete-Filled Steel Tubes

介绍了脱空钢管混凝土偏心受压有限元建模方法,提出了偏心受压脱空钢管混凝土考虑脱空率影响的核心混凝土应力-应变关系,并利用ANSYS程序对不同脱空率和偏心率的脱空钢管混凝土短柱进行非线性有限元计算。计算结果表明,脱空率和偏心率的增大明显地削弱了钢管对核心混凝土的套箍作用。最后,将计算结果与现有试验研究成果进行对比分析,两者的结果总体上吻合较好。

This article describes the finite element model of eccentrically-loaded separate concrete-filled steel tubes.A stress-strain relation of core concrete is presented,in which the confinement effect of steel tube to core concrete is modified by separation ratio.Then finite element analyzed models were modeled by ANSYS with different separation ratio and eccentric ratio.The results showed that the separation ratio and eccentric ratio effect significantly to the confinement effect of steel tube to core concrete.At last,comparison was carried out between with the calculation and the results of test,two results agreed well.