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建立局部火灾下3层3跨钢管混凝土、型钢混凝土、钢筋混凝土平面框架火灾下温度场和力学性能分析的有限元模型。在此基础上,研究了三种平面框架结构的耐火极限状态、不同受火工况和梁荷载水平条件下框架结构的变形和破坏规律、受火梁的内力状态以及结构耐火极限的规律,并对三种平面框架的耐火性能进行了比较。
The finite element model of temperature field and mechanical property analysis of three-story, three-span CFST, SRC, RC frame fire under local fire is established. On this basis, the law of fire resistance of three kinds of plane frame structures, the deformation and failure of frame structures under different fire conditions and beam load levels, the internal force state of fire beams and the fire resistance of structures are studied. The fire resistance of the three flat frames was compared.