【摘要】 地震及次生火灾是严重威胁人类社会安全的重大灾害,历史上曾多次带来巨大生命财产损失。地铁地下结构作为当今大中型城市基础建设的重要组成部分,一旦在强震或震后火灾中破坏,将带来重大的社会和经济损失,震后救援和修复也极为困难。地下结构的抗震及抗火研究起步较晚,城市地下结构在地震及其次生火灾作用下的灾变性能亟待研究。通过三维精细化非线性有限元数值模拟,将动力时程分析、热传导分析和热力分析相结合,研究了典型地铁车站结构在地震及次生火灾中的变形、损伤及内力演化,讨论了地下结构地震损伤对其抗火性能的影响,为地铁地下结构的抗震抗火设计提供参考。更多还原

【Abstract】 Earthquakes and earthquake-induced fires, which have engulfed numerous lives and property many times in history, are significant disasters severely threatening human society. Nowadays underground structures usually constitute an important part in infrastructures in large-scale cities. These structures, once damaged in earthquake or earthquake-induced fire, will cause immense social and economic loss and will make post-earthquake repair extremely difficult. As seismic and fire resistance studies of underground structures are latecomers, it has become quite urgent to study the function change of such structures. In the paper, a 3 D nonlinear FE simulation was performed, combining with the dynamic historical analysis, heat transfer analysis and thermal analysis. Deformation, damage and internal force evolution of a typical subway station structure under earthquake and earthquake-induced fire were studied. The impact of earthquake damage on the fire resistance performance of the structure was discussed. The conclusions here may shed some light on the seismic and fire resistance design of subway underground structures.更多还原