长期荷载作用下钢管混凝土偏压柱力学性能的有限元分析

摘要

采用有限元法建立了长期荷载作用下钢管混凝土偏压柱的分析模型,并通过试验验证；对考虑长期荷载影响的钢管混凝土偏压柱的荷载-变形全过程曲线以及钢管与核心混凝土之间相互作用等力学性能进行了分析,并与不考虑长期荷载影响的钢管混凝土柱力学性能进行了比较.结果表明:长期荷载作用下钢管混凝土偏压柱的承载力降低且对应的跨中挠度增大；同时延缓了钢管与核心混凝土之间的相互作用.%A finite element (FE) model was established to simulate the concrete-filled steel tubular (CFST) beam-column subjected to long-term sustained loading, the results were verified by experiment. By using the finite element model, the influence of long-term loading on the mechanical behavior of CFST beam-columns was researched in terms of the relation between load and deformation, and the interaction between steel tube and core concrete. The predicted behaviour of the CFST with long-term sustained loading was compared with that of the CFST without long-term effect. The results showed that the long-term sustained loading decreased the ultimate strength of CFST beam-columns and increased corresponding deformation, at last delayed the occurrence of interaction between steel tube and core concrete.