摘要
超高层建筑由于单塔体量较大,结构经济指标备受关注,寻找最合理结构体系是超高层建筑不断自我迭代更新的主题。高烈度区和低烈度区塔楼控制方向完全不同,着重介绍优化过程以寻找低烈度区超高层塔楼的最优结构。以某位于低烈度6度区的建筑高度250m超高层塔楼为例,根据塔楼初步方案确定控制指标为刚重比和剪重比,以控制指标为目标进行附加质量和自重的迭代优化。其次是提高结构刚度,核心筒尺寸根据竖向交通及设备管井已确定,在建筑允许条件下通过柱的不同排布实现了更好的框架刚度贡献;纯混凝土柱重量贡献大于刚度贡献,通过对比叠合柱和型钢柱,选取了更合理的叠合柱截面形式;在低烈度区结构竖向承载满足基本需求而水平刚度不满足规范要求的情况下,通过增加伸臂桁架提高整体刚度;通过分析不同伸臂桁架形式,选取了最有效的伸臂形式。通过降低结构冗余重量和有效提高结构刚度选出最高效结构,且建筑品质优、造价合理。
Due to the large volume of a single tower,the structural economic indicators of super high⁃rise buildings have attracted much attention.Finding the most reasonable structure system is the theme of continuous self iteration and updating of super high⁃rise buildings.The control direction of tower buildings in high intensity and low intensity areas is completely different.The optimization process was introduced to find the optimal structure of super high⁃rise buildings in low intensity areas.Taking a super high⁃rise tower with a building height of 250m located in a low intensity 6 degree zone as an example,the control indicators determined based on the preliminary tower plan are the stiffness to weight ratio and shear to weight ratio.The iterative optimization of additional mass and self⁃weight was carried out with the control indicators as the goal.Next is to improve the structural stiffness.The size of the core tube is determined based on vertical traffic and equipment pipe wells,and under the allowable conditions of the building,better contribution to the stiffness of the frame is achieved through different arrangements of columns.The weight contribution of pure concrete columns is greater than the stiffness contribution,and a more reasonable laminated column section form was selected by comparing laminated columns and steel columns.In the case of low seismic intensity zone where the vertical load of low structure meets the basic demand but the horizontal stiffness does not meet the code requirement,the overall stiffness is improved by adding the extension arm truss.The most effective extension arm truss form was selected by analyzing different extension arm forms.The most efficient structure was selected by reducing redundant weight and effectively improving structural stiffness,with high architectural quality and reasonable cost.
作者
刘长东
秦凯
卢清刚
李源
刘永豪
史炎升
王俊亮
刘华
LIU Changdong;QIN Kai;LU Qinggang;LI Yuan;LIU Yonghao;SHI Yansheng;WANG Junliang;LIU Hua(Beijing Institute of Architectural Design Co.,Ltd.,Beijing 100045,China)
出处
《建筑结构》
北大核心
2024年第13期57-62,80,共7页
Building Structure
关键词
超高层建筑
刚重比
迭代优化
叠合柱
伸臂桁架
super high⁃rise building
rigidity to weight ratio
iterative optimization
stacked column
extension arm truss
