【摘要】 采用非线性有限元法,以钢管与混凝土之间的黏结初应力代表核芯混凝土的收缩作用,通过计算得出钢管高强混凝土轴压构件在不同程度自收缩作用影响下的压力-应变全过程曲线。通过对这些曲线的分析,总结了核芯混凝土纵向收缩单独作用、径向收缩单独作用及2个方向同时收缩作用时对钢管高强混凝土轴压构件压力-应变全过程曲线的影响。结果表明,自收缩会降低钢管混凝土构件的比例极限和屈服强度,同时会降低构件的模量,对构件的极限承载力有不利的影响。更多还原

【Abstract】 Authors used nonlinear finite element method to calculate and produce the compression-strain relationship of concrete-filled steel tube specimens under different shrinkage function influence.The initial adhesive stress between concrete and steel tube was substituted for the influence of shrinkage function.Influences of lengthways shrinkage function,radial shrinkage function and both directions’ shrinkage function on the compression-strain relationship of concrete-filled steel tube were summarized by analyzing the calculation curves.The results show that the shrinkage functions of concrete will decrease the proportion limit,yield strength and modulus of elasticity of high-strength concrete-filled steel tube specimen,and have a bad influence on the ultimate bearing capacity of concrete-filled steel tube.更多还原