(1 湖南省建筑设计院集团股份有限公司, 长沙 410012; 2 湖南省建筑设计院集团股份有限公司新型复杂结构研究中心, 长沙 410012; 3 湖南大学土木工程学院, 长沙 410082)

摘要: 假定外框柱的轴向刚度与核心筒的弯曲刚度沿结构高度不变,忽略转动惯量的影响,同时认为水平伸臂与外框柱铰接,与核心筒刚接。 基于分布参数体系的振动理论,考虑核心筒剪切变形和加强层弯曲刚度的影响,对带有一道加强层的框架-核心筒结构体系进行动力分析,得出了该结构体系前三阶自振频率与加强层位置的关系,并对考虑加强层弯曲刚度影响时核心筒剪切变形所引起振动频率的变化进行了分析。 分析结果表明:设计时应选择设置“有限刚度”的加强层,适当增加与水平伸臂相连的外框柱轴向刚度,合理设置加强层的位置,核心筒剪切变形对带加强层高层建筑结构的自振频率影响可忽略不计。

关键词: 框架-核心筒结构; 振动特性; 弯曲刚度; 加强层位置; 动力分析; 剪切变形

中图分类号:TU311. 3 文献标志码:A 文章编号:1002-848X(2022)22-0079-05

DOI:10. 19701 / j. jzjg. ZJ220103

Influence of outrigger bending stiffness on vibration characteristic of frame-core tube structure

WANG Siqing1,2, CHEN Yu1,2, SHEN Pusheng3

(1 Hunan Architectural Design Institute Group Co. , Ltd. , Changsha 410012, China; 2 New Complex Structure ResearchCenter of Hunan Architectural Design Institute Group Co. , Ltd. , Changsha 410012, China; 3 College of Civil Engineering,Hunan University, Changsha 410082, China)

Abstract: It is assumed that the axial stiffness of the outer frame column and the bending stiffness of the core tube areconstant along the structural height,ignoring the influence of the moment of inertia. At the same time, it is considered thatthe horizontal outrigger is hinged with the outer frame column and rigidly connected with the core tube. Based on thevibration theory of the distributed parameter system, considering the influence of shear deformation of the core tube andbending stiffness of outrigger, the dynamic analysis of the frame-core tube structure system with an outrigger was carriedout. The relationship between the first three natural frequencies of the structural system and the position of the strengthenedlayer was obtained. And the change of the vibration frequency caused by the shear deformation of the core tube whenconsidering the bending stiffness of outrigger was analyzed. The results of analysis show that the design should choose to setthe ‘finite stiffness’ of outrigger, appropriately increase the axial stiffness of the outer frame column connected to theoutrigger, and reasonably set outrigger position. The influence of the shear deformation of the core tube on the naturalfrequency of the high-rise building structure with the strengthening layer is negligible.

Keywords:frame-core tube structure; vibration characteristic; bending stiffness; outrigger position; dynamic analysis;shear deformation

∗国家自然科学基金项目(50378035)。

第一作者:王四清,学士,教授级高级工程师,一级注册结构工程师,主要从事新型复杂结构设计与研究,Email:AG5678@163. com。

[引用本文] 王四清,陈宇,沈蒲生. 加强层弯曲刚度对框架-核心筒结构振动特性影响[ J]. 建筑结构,2022,52(22):79-83. WANG Siqing,CHEN Yu,SHEN Pusheng. Influence of outrigger bending stiffness on vibration characteristicof frame-core tube structure [J]. Building Structure,2022,52(22):79-83.