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该文建立了受火区域采用实体单元和壳单元的精细模型、非受火区域采用梁柱模型的钢管混凝土柱-钢梁平面框架耐火性能分析的有限元计算模型,计算结果与试验结果吻合较好。利用上述模型对局部火灾下钢管混凝土柱-钢梁平面框架的破坏形态、破坏机理、变形及内力重分布规律进行了研究。分析表明,火灾下钢管混凝土柱-钢梁平面框架出现了2种典型的破坏形态:第1种为由受火钢梁整体失稳导致的框架局部破坏形态;第2种为由受火钢管混凝土柱破坏导致的框架整体破坏形态。
In this paper, the finite element model of the fire resistance of CFST column-steel beam plane frame which is not fire-affected by the beam-column model is established. The calculated results are in good agreement with the experimental results it is good. The failure mode, failure mechanism, deformation and internal force redistribution rule of CFST column-steel beam plane frame under local fire are studied by using the above model. The analysis shows that there are two kinds of typical failure modes of the CFST column-steel beam plane frame under fire: the first one is the local failure mode of the frame caused by the overall instability of the steel beam subjected to fire; Damage caused by the column as a whole form of destruction of the framework.