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基于ABAQUS有限元软件,选取合理的材料本构模型,建立温度和荷载耦合作用下型钢混凝土约束柱有限元模型,有限元模型的计算值与已有试验结果吻合较好。利用上述模型考虑荷载比和荷载偏心率的影响,对不同轴向约束和转动约束作用下的型钢混凝土约束柱的耐火性能进行系统的参数分析。结果表明:轴向约束相当于竖向约束弹簧,在一定程度上分担柱顶竖向荷载,有利于提高柱的耐火极限;转动约束相当于转动约束弹簧,在一定程度上减小弯矩沿柱长的分布值,同时也阻止柱半高处的侧向变形;轴向约束作用或轴向约束和转动约束共同作用下,荷载比相同且小于或等于0.6时,柱的耐火极限随偏心率的增大而增大,偏心率相同时,柱的耐火极限随荷载比的增大而减小。
Based on ABAQUS finite element software, a reasonable material constitutive model was selected to establish the finite element model of steel reinforced concrete confined column under temperature and load coupling. The calculated results of the finite element model agree well with the existing experimental results. Taking into account the influence of load ratio and load eccentricity on the above model, the parameters of fire resistance of SRCB under different axial constraints and rotational constraints were systematically analyzed. The results show that the axial restraint is equivalent to the vertical restraining spring, sharing the vertical load at the top of the column to a certain extent, which is helpful to improve the fire resistance of the column. The rotation restraint is equivalent to the rotation restraining spring, which reduces the moment along the column to a certain extent Long distribution values, but also to prevent the column half-height lateral deformation; axial restraint or axial restraint and rotation constraints under the same effect, the same load ratio and less than or equal to 0.6, the column with the fire resistance limit of eccentricity Increasing and increasing, the same eccentricity, the column fire resistance limit decreases with the load ratio increases.