中文摘要：

为研究长期荷载作用对钢管混凝土叠合柱力学性能的影响规律，对考虑长期荷载作用影响时构件的荷载一变形曲线进行了全过程分析．基于合理的材料本构关系模型，采用有限元法建立了长期荷载作用下叠合柱力学性能分析模型，对长期荷载作用下叠合柱的工作机理以及影响叠合柱承载力的参数进行了细致分析．结果表明：考虑长期荷载作用影响时，叠合柱的承载力降低且对应的跨中挠度增大；随着截面含钢管率的增大，在长期荷载作用阶段，叠合柱中钢管混凝土承担由钢筋混凝土卸下荷载的比例增大；当长细比大于10时，随着长细比、外包混凝土强度的增大及截面含钢管率、截面配筋率的减小，长期荷载作用下叠合柱的承载力出现下降．

英文摘要：

An analytic model of concrete filled steel tube （CFST） reinforced concrete （CFSTRC） columns subjected to long-term sustained loading was established based on the reasonable material models, and load-deformation relationship curves of CFSTRC columns under sustained loading were analyzed. By the finite element method, the mechanical behavior analysis and parameter analysis of CFSTRC column subjected to long-term sustained loading were carried out. The results show that long- term sustained loading decreases the ultimate strength of the CFSTRC column while increases the corresponding deformation; the proportion of the load carried by the CFST increases with the increasing steel tube ratio during the long-term sustained loading stage; under sustained loading, when the slenderness ratio is greater than 10, the ultimate bearing capacity of the CFSTRC columns decreases with the increase of slenderness ratio and outer concrete strength, or the decrease of steel tube ratio and reinforcement ratio.