PERFORMANCE OF PLANE FRAMES WITH CONCRETE FILLED STEEL TUBE COLUMNS AND STEEL BEAMS SUBJECTED TO LOCAL FIRE
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摘要: 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。Abstract: A finite element (FE) model was proposed to simulate the performance of composite frames with concrete filled steel tube (CFST) columns and steel beams subjected to local fire. In the model, the heated members were simulated with shell elements and continuum elements while the other members were simulated with beam elements. The results of this FE model agreed well with those of test results. The FE model was then used to study the failure mode, the failure mechanism, the deformation and the internal force redistribution of the CFST frames. The results show that the CFST frames have two typical failure modes. The first failure mode is the local failure induced by the global buckling of the heated steel beam, and the second failure mode is the global failure induced by the heated column failure
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Keywords:
- fire /
- concrete filled steel tube column /
- steel beam /
- plane frames /
- failure mechanism /
- failure mode
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