高强度Q460钢梁抗火性能研究(Ⅰ)——理论分析  

Fire Resistance Analysis of High Strength Q460 Steel Beams-Part I:Theoretical Analysis

作　　者：王卫永[1] 周一超[1] 于宝林[2] 彭川[3] 

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]密歇根州立大学土木与环境工程系,美国密歇根48824 [3]重庆理工大学资产管理公司,重庆400050

出　　处：《土木建筑与环境工程》2014年第3期64-71,共8页Journal of Civil,Architectural & Environment Engineering

基　　金：重庆市高等学校青年骨干教师资助计划;中国博士后科学基金(20110490811;2012T50765)

摘　　要：为了得到高强度Q460钢梁高温下的抗火性能,采用有限差分法推导了高温下高强度Q460钢梁的截面温度计算方法并计算了温度分布,提出了钢梁各个组件温度的修正公式。基于常温下钢梁的整体稳定临界弯矩,根据Q460钢材的高温力学性能参数,分析得到了高强度Q460钢梁高温下临界弯矩和整体稳定验算参数;并利用等效刚度法考虑了温度不均匀分布的影响,研究了高强度Q460钢梁在不均匀温度下的极限承载力、临界温度和稳定系数。In order to investigate the fire resistance of high strength steel beams made from Q460, the method to compute temperature distribution of high strength Q460 steel beams was derived and the temperature distribution was calculated by using finite difference method. The modified equations of temperature for components of steel beam were proposed. According to critical moment at room temperature and mechanical properties of high strength Q460 steel at elevated temperature, the critical moment and stability checking coefficient were obtained by analysis. The load bearing capacity and critical temperature as well as stability factor were studied by using equivalent stiffness method through considering the effect of temperature gradient on stiffness.

关 键 词：不均匀温度 高强钢 抗火性能 钢梁 

分 类 号：TU392[建筑科学—结构工程]