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基于有限元软件ABAQUS建立了高温后钢管再生混凝土轴压短柱的理论模型,其中再生混凝土的应力—应变关系考虑了再生混凝土骨料取代率和曾经历的最高温度的影响,计算了高温后钢管再生混凝土轴压短柱的破坏形态、荷载—变形关系、承载力和组合弹性模量,计算结果与试验结果总体吻合较好。利用有限元模型对高温后钢管再生混凝土轴压短柱的荷载—变形关系进行了全过程分析,揭示了受力过程中钢管与核心再生混凝土关键位置的应力—应变关系及它们之间相互作用应力的变化规律。研究结果可为有关钢管再生混凝土结构的工程实践和规程制定提供参考。
Based on the finite element software ABAQUS, a theoretical model of axial compression concrete filled steel tubular reclaimed concrete columns after high temperature is established. The stress-strain relationship of recycled concrete takes into account the effect of recycled concrete aggregate replacement ratio and the maximum temperature experienced. The failure morphology, load-deformation relationship, bearing capacity and combined elastic modulus of recycled concrete short columns are in good agreement with the calculated results. The finite element model was used to analyze the whole process of the load-deformation relationship between high-temperature recycled concrete-filled steel tubular short columns and the stress-strain relationship between the key locations of the steel pipe and the core recycled concrete during the stress and their interaction stress The law of change. The results of the study can provide references for the engineering practice and procedure formulation of recycled concrete structures of steel pipe.