对超高层巨柱稳定性分析中计算假定的探讨  

Discussion on calculation assumptions in stability analysis of mega column of super high-rise structure

作　　者：陈寅 廖耘 周定 CHEN Yin;LIAO Yun;ZHOU Ding(RBS Architectural Engineering Design Associates,Guangzhou 510170,China)

机构地区：[1]广州容柏生建筑结构设计事务所,广州510170

出　　处：《建筑结构》2023年第23期79-84,62,共7页Building Structure

摘　　要：对超高层结构设计中巨柱稳定性分析的关键假定及简化的影响进行了归纳和探讨,分析了加载模式、有侧移或无侧移失稳模式、楼盖、环桁架、伸臂桁架、巨型斜撑、外框梁、上下端边界约束条件等因素的影响。结果表明:巨柱的平动约束主要取决于核心筒及楼盖,转动约束主要取决于上下端的加强层桁架及巨柱;核心筒刚度不足时有可能出现侧移失稳,且普通楼盖对这种失稳模式几乎没有抑制能力。最后,给出了一种较简便的分析方法:基于一个整体模型即可求得各段巨柱的屈曲荷载,且较准确地考虑了边界约束条件及荷载条件对巨柱稳定承载力的影响。The influence of main assumptions and simplification of the stability analysis of mega columns in the design of super high-rise structure was discussed,including the following factors:loading mode,instability mode with or without lateral movement,floor,belt truss,outrigger truss,mega brace,frame beam,upper and lower boundary constraints,etc.The results shows that the translational constraint of the mega column mainly depends on the core tube and floor,while the rotational constraint mainly depends on the belt truss or outtrigger and the mega column above and below.When the stiffness of the core tube is insufficient,there may be sway buckling,and ordinary floors have little ability to suppress this instability mode.Finally,a simple analysis method is given:based on a global model,the buckling load of each part of the mega columns can be obtained,and the influence of boundary constraints and load conditions on the buckling load of mega columns is considered more accurately.

关 键 词：超高层结构 巨型框架结构 巨柱 结构稳定 屈曲分析 计算长度 

分 类 号：TU318[建筑科学—结构工程]