火灾后钢梁安全稳定承载力研究  

Study on Stability Bearing Capacity of Steel Beam after Fire Disaster

作　　者：陈建锋[1] 周天华[1] 

机构地区：[1]长安大学建筑工程学院,陕西西安710061

出　　处：《水利与建筑工程学报》2013年第4期43-45,50,共4页Journal of Water Resources and Architectural Engineering

基　　金：中国博士后科学基金资助(2011M501428);中央高校基本科研业务费专项资金(CHD2012TD012)

摘　　要：钢梁在遭受火灾后,结构钢材料受损、构件刚度退化,导致钢梁安全承载性能下降。为了研究火灾后钢梁剩余稳定承载力变化规律,以受火钢梁为研究对象,采用稳定平衡分析,对比了钢梁火灾前后临界弯矩的变化,推导出钢梁火灾后整体稳定系数计算公式;并基于结构钢材性试验成果,编制了钢梁高温后整体稳定系数变化速查表;在此基础上,提出钢梁整体稳定实用计算方法。可为火灾后钢结构安全评估加固提供参考。After experiencing fire disaster,the steel beam is damaged on a certain degree,such as the material damage and stiffness degradation,which can decrease the structural safety reliability.In order to study the steel beam’s stability bearing capacity after fire disaster,through comparing the critical moment of the steel beam before and after the fire disaster,the integral stability coefficient formula is derived for the steel beam after fire disaster by using the equilibrium analysis method.Then,the quick table about the formula is presented for practical use according to the test resutls.Based on the above,the practical and simplified method for analyzing the steel beam’s integral stability after fire disaster is presented.The method can provide references for the fire damage assessment and reinforcement of steel structures.

关 键 词：钢梁 火灾后 整体稳定系数 稳定承载力 

分 类 号：TU391[建筑科学—结构工程] X928.7[环境科学与工程—安全科学]