巨型钢框撑—混凝土核心筒结构的性能分析

Performance analysis for giant steel braced frame-RC core wall structure

巨型钢框撑—钢筋混凝土核心筒结构是由巨型钢框架、巨型支撑、钢筋混凝土核心筒和伸臂桁架组成的一种具有多道抗震防线的新型超高层结构体系。为了研究这种新型结构体系的性能,首先建立了巨型钢框架—钢筋混凝土核心筒结构模型,在此基础上分析了不同形式的巨型支撑以及去除巨型梁下层次柱对结构模态、侧移及内力的影响。结果表明:设置巨型支撑可以有效提高结构抗侧刚度,减小楼层侧移与层间位移角,增加外框架所承担的竖向荷载、剪力和弯矩,X型支撑形式优于倒V型支撑。移除巨型梁下层次柱后,结构整体刚度下降,侧移增大,但对结构底部剪力和弯矩的分配影响不大。

The giant steel braced frame-RC（Reinforced Concrete） core wall structure is a new type of structural system for super high-rise buildings,consisting of a giant steel frame,some mega braces,RC core walls,and outrigger trusses.A regular giant steel braced frame-RC core wall model was constructed and the influence of mega braces and the absence of the subordinate columns under the mega beams on the mode,displacement and internal forces of the structure were analyzed.The results indicate that setting mega braces on the giant frame can improve the lateral stiffness,reduce the story drift and increase the bearing capacity of the frame.Removing the subordinate columns under the mega beams will decrease the integrated stiffness,but has little influence on the distribution of shearing force and bending moment between the giant frame and core wall.