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火灾后钢结构的评估工作中,钢构件剩余承载力的确定尤为重要。本文以两端约束的钢梁为研究对象,分析了火灾后钢梁的剩余承载能力及其影响因素。分析过程中,采用有限元程序ANSYS建立三维实体钢梁模型,对其在负荷状态下进行升温、降温、再加载,用以模拟实际工程中钢梁受火后继续承载的全过程。通过分析得到钢梁在升温、降温再加载整个过程中的变形特征和内力变化,同时得到了初始荷载和经历的最高温度对钢梁变形、受力及剩余承载力的影响规律。
After the fire assessment of steel structure, the determination of residual bearing capacity of steel components is particularly important. In this paper, the steel beam with both ends constrained is taken as the research object, the residual bearing capacity of the steel beam after fire and its influencing factors are analyzed. In the process of analysis, the three-dimensional solid steel beam model was established by using the finite element program ANSYS. The steel structure was heated, cooled and reloaded under load to simulate the whole process of the steel beam continuing to be carried after being exposed to fire. Through the analysis, the deformation characteristics and internal force of the steel girder during heating, cooling and reloading are obtained. The influence of initial load and maximum temperature on the deformation, force and residual bearing capacity of the steel girder is obtained.