某超高层混凝土结构火灾作用下的力学响应分析  

THE MECHANICAL RESPONSE ANALYSIS OF A SUPER TALL CONCRETE STRUCTURE UNDER FIRE

作　　者：英明鉴[1] 李易[2] 陆新征[1] 叶列平[1] 闫维明[2] 

机构地区：[1]土木工程安全与耐久教育部重点实验室清华大学土木工程系,北京100084 [2]城市与工程安全减灾教育部重点实验室北京工业大学建筑工程学院,北京100124

出　　处：《工程力学》2015年第5期19-27,共9页Engineering Mechanics

基　　金：国家重点基础研究发展计划(973)项目(2012CB719703);国家自然科学基金项目(51222804)

摘　　要：火灾是高层建筑安全的主要威胁之一。建筑物在火灾作用下的力学响应是整体结构的行为,其主要特点是结构系统内受火区域子结构的刚度和承载力随火灾的发展而变化,进而引起结构体系内的内力重分布。目前,针对高层结构构件的抗火性能已有相关研究开展,而对于高层混凝土结构的整体抗火性能方面的研究还并不多见。该文采用考虑高温作用的纤维梁和分层壳模型,对某超高层建筑结构进行了整体结构的抗火分析。通过模拟超高层结构不同部位在标准升温曲线作用下的整体结构响应,比较分析了火灾作用下超高层结构的抗火性能。最后,采用Pushdown方法分析了火灾作用下结构的抗倒塌性能。Fire is one of the main threats to the safety of high-rise structures. The mechanical response of a building under fire is the behavior of the overall structure of which the main feature is that the structural stiffness and bearing capacity of heated sub-structures vary with the fire development and in turn lead to the redistribution of the internal forces within the structural system. Currently, the relevant researches about the fire resistance of structural members of high-rise structures have been performed, but the study of the overall fire resistance performance of high-rise concrete structures is rare. In this paper, the fiber beam model and the multi-layer shell model that allow for the effect of high temperature are used to analyze the overall fire resistance performance of a high-rise concrete structure. Through simulating the different parts of the overall structure under the standard fire scenario, a comparative analysis of the fire resistance of super tall structures is taken. Finally, Pushdown method is used to analyze the collapse-resistant capacity under fire.

关 键 词：高层混凝土结构 抗火性能分析 有限元模型 纤维梁 分层壳 

分 类 号：TU973.2[建筑科学—结构工程]