型钢混凝土约束柱耐火性能研究
发布时间：2018-09-01 13:01
【摘要】：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。
[Abstract]:Based on the ABAQUS finite element software, the finite element model of SRC confined column under the coupling of temperature and load is established by selecting a reasonable material constitutive model. The calculated value of the finite element model is in good agreement with the experimental results. Taking into account the influence of load ratio and load eccentricity, the fire resistance of SRC confined columns under different axial and rotational constraints is systematically analyzed. The results show that axial constraint is equivalent to vertical constraint spring, sharing vertical load on the top of cylinder to a certain extent, which is beneficial to increase the fire resistance limit of column, and rotation constraint is equivalent to rotational constraint spring. The distribution value of bending moment along the length of column is reduced to some extent, and the lateral deformation of the column is prevented at the same time. When the load ratio is the same and is less than or equal to 0.6, the axial constraint or the combined action of axial constraint and rotation constraint, The fire resistance limit of the column increases with the increase of eccentricity. When the eccentricity is the same, the fire resistance limit of the column decreases with the increase of load ratio.
【作者单位】： 中国建筑科学研究院;建设部防灾研究中心;
【基金】：中国建筑科学研究院自筹基金项目(20150111331030079,20140111330730062)
【分类号】：TU398.9;TU352.5
[Abstract]:Based on the ABAQUS finite element software, the finite element model of SRC confined column under the coupling of temperature and load is established by selecting a reasonable material constitutive model. The calculated value of the finite element model is in good agreement with the experimental results. Taking into account the influence of load ratio and load eccentricity, the fire resistance of SRC confined columns under different axial and rotational constraints is systematically analyzed. The results show that axial constraint is equivalent to vertical constraint spring, sharing vertical load on the top of cylinder to a certain extent, which is beneficial to increase the fire resistance limit of column, and rotation constraint is equivalent to rotational constraint spring. The distribution value of bending moment along the length of column is reduced to some extent, and the lateral deformation of the column is prevented at the same time. When the load ratio is the same and is less than or equal to 0.6, the axial constraint or the combined action of axial constraint and rotation constraint, The fire resistance limit of the column increases with the increase of eccentricity. When the eccentricity is the same, the fire resistance limit of the column decreases with the increase of load ratio.
【作者单位】： 中国建筑科学研究院;建设部防灾研究中心;
【基金】：中国建筑科学研究院自筹基金项目(20150111331030079,20140111330730062)
【分类号】：TU398.9;TU352.5
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