圆钢管混凝土轴压长柱的极限承载力

基于双剪统一强度理论,考虑钢管中间主应力(径向压力)对环向拉力和纵向压力的影响,建立了钢管的承载力公式;同时,避开混凝土破坏准则中侧压影响系数的不确定性分析,根据混凝土破坏时的统一强度准则建立其承载力公式,进而叠加建立了钢管混凝土短柱的承载力公式。在此基础上,按照弹性模量理论推导出钢管混凝土长柱的稳定影响系数,建立了其极限承载力公式。结果表明,改变加权参数值,计算得出的承载力也随之发生变化。通过与相关文献中的试验值进行比较,发现试验值与计算值吻合良好。

Ultimate Bearing Capacity of Concrete-filled Circular Steel Tubular Long Columns with Axial Compression

Considering the intermediate principal stress effect of the steel tube on the circumferential tension and longitudinal compression based on the twin shear unified strength theory,a formula of bearing capacity of steel tube was established.Meanwhile,in terms of the unified strength criterion of concrete and avoiding uncertainty analysis of effect factor of circumferential compression in concrete failure criterion,the formula of bearing capacity of core concrete was established.And then by splicing the bearing capacity of short concrete-filled steel tube(CFST),the formula of bearing capacity was formed.Based on it,through elastic modulus theory,the stability effect factor of concrete-filled steel tubular long columns was deduced and then the formula of its ultimate bearing capacity was built.The results show that by altering weighted parameter value,the bearing capacity of concrete-filled steel tube is changed.The calculations are all agree well with the experiment results through comparing with the experimental values of related references.