火灾后约束钢梁的剩余承载力研究  

Research on the residual bearing capacity of restraint steel beam after fire

作　　者：杨秀英[1] 宋杰 刘永欣[1] 

机构地区：[1]聊城大学建筑工程学院土木系,山东聊城252000 [2]山东省建筑科学研究院,山东济南250031

出　　处：《建筑科学》2017年第3期119-122,共4页Building Science

基　　金：山东省自然科学基金(No.ZR2012EEQ025)

摘　　要：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。During the post-fire assessment of steel structures,the residual bearing capacity determination of the members is very important. The restraint steel beam is taken for study in this paper,the residual bearing capacity and its influencing factors of the beam are researched. In analysis,three-dimensional solid model of steel beam is built with the finite element program ANSYS,then temperature and load are applied individually with initial load to simulate the whole carrying process after fire of the actual project. By analyzing,the deformation and internal force of the steel beam are get during the process of heating,cooling and continue load,and the influences of initial load and highest temperature on the residual bearing capacity of the beam are also derived.

关 键 词：火灾 约束钢梁 剩余承载力 残余变形 

分 类 号：TU541[建筑科学—建筑技术科学]