【摘要】 对设肋方矩形不锈钢管混凝土轴压短柱的力学性能进行了有限元模拟,计算结果得到试验结果的验证。在此基础上,进行了设肋不锈钢管混凝土轴压受力特性分析和影响因素分析,最后提出轴压短柱承载力的实用设计公式。研究结果表明,在相同轴向应变下,设肋不锈钢管混凝土横向变形比不设肋不锈钢管混凝土小,对核心混凝土的约束效果更好,在整个过程中,不锈钢管角部的约束力最大且持续增加,构件的承载力和后期延性比不设肋构件大;和设肋普通钢管混凝土相比,设肋不锈钢管混凝土轴压极限承载力稍小,而后期承载力提高。随着加劲肋宽厚比、混凝土强度、不锈钢强度的增加或不锈钢管宽厚比的减少,设肋不锈钢管混凝土的轴压极限承载力增大。更多还原

【Abstract】 The behavior of concrete-filled stiffened stainless steel tubular stub columns with square and rectangular cross-sections subjected to axial compression is simulated by finite element method. The calculated results are validated by the experimental results. Furthermore,the mechanical characteristics and parameter influence of concrete-filled stiffened stainless steel tubular columns under axial compression are analyzed. Finally,the practical calculation formula on axial compressed load bearing capacity is proposed. The results show that,at the same axial stress,the transverse deformation of concrete-filled stiffened stainless steel tubular columns is smaller than that of members without stiffeners,and the effect of confinement to core concrete is better. During the load procedure,the corner confined pressure of stainless steel tube is maximal and keeps rising. The load bearing capacity and the late ductility of members with stiffeners are improved. Compared to the concrete-filled stiffened carbon steel tubes,the concrete-filled stiffened stainless steel tubes have a slightly smaller axial compressed ultimate load bearing capacity and higher capacity at the late stage. With the increase of width to thickness ratio of stiffeners,concrete strength,stainless steel strength,or the decrease of width to thickness ratio of stainless steel tube,the axial compressed ultimate load bearing capacity of concrete-filled stiffened stainless steel tubular columns increases.更多还原