【摘要】 为研究升降温全过程火灾后中空夹层高强钢管混凝土短柱的抗火性能，在确定不同阶段高强钢材和约束混凝土的本构模型的前提下，利用ABAQUS有限元软件，建立了中空夹层高强钢管混凝土短柱的温度场模型和热力学分析模型，并利用已有的试验数据对模型进行了验证。分析了升温时间、空心率、材料强度和轴压比等参数对短柱全过程火灾后剩余承载力的影响。结果表明，随着升温时间的增长，全过程火灾后中空夹层高强钢管混凝土短柱的剩余承载力大幅下降；随着空心率增加，短柱的剩余承载力系数先增加后减小，其空心率为0.52的短柱抗火性能最优；材料强度和轴压比对短柱的剩余承载力系数影响不大，剩余承载力随材料强度增加而增加。更多还原

【Abstract】 In order to study the fire resistance of concrete filled double-skin high-strength steel tubular short columns(CFDST) after fire in the whole process of rising and cooling, the temperature field model and thermodynamic analysis model of concrete filled double-skin high-strength steel tubular short columns were established by using the finite element software ABAQUS after determining the constitutive models of the high strength steel and constrained concrete at different stages. And the model is verified by the existing experimental data. The effects of heating time, hollow rate, material strength and axial compression ratio on the residual bearing capacity of short columns were analyzed. The results show that with the increase of heating time, the residual bearing capacity of concrete filled double-skin high-strength steel tubular short columns decreases significantly after the whole process fire;With the increase of hollow ratio, the residual bearing capacity coefficient of short columns first increases and then decreases, and the short column with hollow ratio of 0.52 has the best fire resistance; Material strength and axial compression ratio have little effect on the residual bearing capacity coefficient of short columns, and the residual bearing capacity increases with the increase of material strength.更多还原