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工程力学  2013 

局部火灾下钢管混凝土柱-钢梁平面框架耐火性

DOI: 10.6052/j.issn.1000-4750.2012.07.0492

Keywords: 火灾,钢管混凝土柱,钢梁,平面框架,破坏机理,破坏形态

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Abstract:

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。

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