Based on FE simulation, this paper presents the numerical results of the behavior of steel beams at elevated temperature. The developing course of the behavior of steel beams with several extreme restraints such as simply, hinged and fully supports is systematically investigated, as well as its critical temperature. Furthermore, some detailed parametric analysis is described, including beam span, different levels of applied load and load types. The results show that the boundary conditions can significantly affect the behavior of steel beam in fire; otherwise, the load ratio and beam span have great influence on the behavior of restrained beam while the influence of load types is little, even can be neglected .%本文基于有限元数值模拟结果,通过对几种极端端部约束钢梁在火载荷作用下行为的参数分析,系统比较了简支、铰支和固支等几种典型极端边界约束钢梁的火灾行为发展过程,重点讨论了各自的临界温度,并分析了载荷比、跨度、载荷类型等参数对钢梁火灾行为的影响.结果表明:对于不同的约束情形,受火钢梁的行为发展形态各不相同;载荷比、跨度对钢梁的行为有较大影响,而载荷类型对钢梁火灾下的行为影响较小,甚至于可以忽略.
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