Abstract：Since the “9•11” event, the progressive collapse of super high-rise structures under incidental loads has been greatly concerned. In this paper, the high performance finite elements and their failure criteria both considering high temperature effects, as well as the elemental deactivation technology are adopt to analyze the progressive collapse of a typical super high-rise concrete frame-core tube structure exposed to extreme fire. It can be found that when the multi-storey floor system in the building structure is simultaneously exposed to fire, it performs an overall mechanism similar with Vierendeel action due to the thermal expansion deformation. That leads to the redistribution of the internal forces throughout the structural system not only in the horizontal direction but also in the vertical direction. Thermal expansion and the destruction of the floor system have an important influence on the failure of peripheral columns, which eventually leads to the flexural damage of the columns due to the large second-order effect, triggering the progressive collapse of the structure system.
英明鉴 李 易 陆新征 叶列平. 极端火灾作用下典型超高层混凝土框架-核心筒结构的连续倒塌分析[J]. 土木工程学报, 2016, 49(4): 48-56.
Ying Mingjian Li Yi Lu Xinzheng Ye Lieping . Progressive collapse analysis of a typical super high-rise concrete frame-core tube structure exposed to extreme fire. 土木工程学报, 2016, 49(4): 48-56.
