【摘要】 随着对钢结构整体抗火能力的深入理解,人们意识到单个构件的抗火能力与处于结构整体中的构件抗火能力具有很大不同。实际结构是一个高次超静定体系,在火灾下能够进行承载路径的改变和承载方式的调整,从而具有比单个构件更高的抗火能力,同时,处于结构整体中的构件在火灾下的温度膨胀应力对其抗火能力的影响是不可忽视的因素之一。文章推导了组合梁的轴力——弯矩相关曲线,绐出了考虑结构整体性的平板式组合梁结构抗火极限分析方法,并与有限元分析结果进行了对比,为考虑结构整体性的平板式组合梁抗火设计提供了依据。更多还原

【Abstract】 Many scholars and fire-resistance engineers have realized that the fire resistance capacity of substructure in global structure is much different from that of single member. Furthermore, performance-based fire resistance has become one of main fire resistance research field after Broadgate fire and Card-ington test. Highly redundant structure allows multiple load paths and alternative load bearing modes at high temperature. A theoretical method for evaluating the ultimate fire resistance capacity of composite beam with considering global structure effect is put forward in this paper and comparison of the results of theoretical method with that of finite element method is given for verification.更多还原