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为了给钢管混凝土柱的抗火设计提供有效方法,利用梁单元建立了端部约束钢管混凝土柱耐火性能分析的有限元计算模型.利用上述模型,考虑转动约束、轴向约束以及偏心距的影响,对火灾下端部约束钢管混凝土柱的计算长度系数和稳定系数等进行了系统的参数研究.最后,提出了端部约束钢管混凝土柱的抗火计算方法.
In order to provide an effective method for fire resistance design of concrete filled steel tubular columns, a finite element calculation model of fire resistance analysis of concrete-filled steel tubular columns with end confinement is established by using beam elements.Using the above model, considering the influence of rotational constraint, axial constraint and eccentricity, The calculation of the length coefficient and the stability coefficient of the concrete-filled steel tubular column under the fire is carried out systematically.Finally, the calculation method of the fire resistance of concrete-filled steel tubular columns with end constraint is proposed.