卢啸¹, 吕泉林¹, 徐龙河¹, 李易²
AuthorsHTML:卢啸¹, 吕泉林¹, 徐龙河¹, 李易²
AuthorsListE:Lu Xiao¹, Lü Quanlin¹, Xu Longhe¹, Li Yi²
AuthorsHTMLE:Lu Xiao¹, Lü Quanlin¹, Xu Longhe¹, Li Yi²
Unit:1. 北京交通大学土木建筑工程学院，北京 100044; 2. 北京工业大学建筑工程学院，北京 100124
Unit_EngLish:1．School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China
2．College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China
Abstract_Chinese:针对伸臂桁架斜腹杆在地震灾变过程中发生塑性屈曲, 而宏观梁单元很难模拟塑性屈曲引起的承载力和刚度退化这一问题, 以典型伸臂桁架试验为基础, 在兼顾计算效率和精度的前提下, 提出了基于梁单元和壳单元的伸臂桁架多尺度有限元模型; 建立了典型超高层建筑的多尺度有限元模型, 研究伸臂桁架塑性屈曲对地震灾变全过程的影响．结果表明, 伸臂桁架多尺度模型能较好地预测初始刚度、屈服承载力以及塑性屈曲引起的承载力和刚度退化, 且具有较高的分析效率; 在进行超高层建筑地震灾变模拟时, 不考虑伸臂桁架的塑性屈曲, 会高估伸臂桁架的耗能能力, 低估核心筒和巨柱的损伤程度, 最终影响结构的倒塌模式并高估抗倒塌能力．
Abstract_English:Plastic buckling of diagonal chords in outriggers has often been observed. The macro beam element has a limited capacity to simulate the strength and stiffness deterioration caused by plastic buckling. Based on the typical component seismic tests of outrigger，the multi-scale finite element(FE)model of outrigger combined with the beam and shell elements is proposed considering both accuracy and efficiency. And then the whole FE model of one typical super-tall building is built up with the proposed multi-scale model. Finally，the whole process of earthquake-induced collapse of super-tall building is discussed considering the plastic buckling of outriggers. The results indicate that the proposed multi-scale model of outrigger can accurately and efficiently predict the initial stiffness，yielding strength and the strength and stiffness deterioration caused by plastic buckling. During the earthquake-induced collapse simulation of super-tall building，the seismic energy dissipation capacity of outriggers will be overestimated and the damage of shear walls and mega-columns will be underestimated if the plastic buckling of outrigger is not considered. Consequently，these will affect the potential collapse mode and overestimate the collapse resistance of super-tall buildings.
Keyword_Chinese:超高层建筑; 伸臂桁架; 多尺度模型; 地震灾变; 塑性屈曲
Keywords_English:super-tall buildings; outrigger; multi-scale model; earthquake-induced collapse; plastic buckling

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