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(1 湖南省建筑設(shè)計院集團(tuán)股份有限公司, 長沙 410012; 2 湖南省建筑設(shè)計院集團(tuán)股份有限公司新型復(fù)雜結(jié)構(gòu)研究中心, 長沙 410012; 3 湖南大學(xué)土木工程學(xué)院, 長沙 410082)

摘要: 假定外框柱的軸向剛度與核心筒的彎曲剛度沿結(jié)構(gòu)高度不變,忽略轉(zhuǎn)動慣量的影響,同時認(rèn)為水平伸臂與外框柱鉸接,與核心筒剛接。 基于分布參數(shù)體系的振動理論,考慮核心筒剪切變形和加強(qiáng)層彎曲剛度的影響,對帶有一道加強(qiáng)層的框架-核心筒結(jié)構(gòu)體系進(jìn)行動力分析,得出了該結(jié)構(gòu)體系前三階自振頻率與加強(qiáng)層位置的關(guān)系,并對考慮加強(qiáng)層彎曲剛度影響時核心筒剪切變形所引起振動頻率的變化進(jìn)行了分析。 分析結(jié)果表明:設(shè)計時應(yīng)選擇設(shè)置“有限剛度”的加強(qiáng)層,適當(dāng)增加與水平伸臂相連的外框柱軸向剛度,合理設(shè)置加強(qiáng)層的位置,核心筒剪切變形對帶加強(qiáng)層高層建筑結(jié)構(gòu)的自振頻率影響可忽略不計。

關(guān)鍵詞: 框架-核心筒結(jié)構(gòu); 振動特性; 彎曲剛度; 加強(qiáng)層位置; 動力分析; 剪切變形

中圖分類號:TU311. 3 文獻(xiàn)標(biāo)志碼:A 文章編號: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

∗國家自然科學(xué)基金項目(50378035)。

第一作者:王四清,學(xué)士,教授級高級工程師,一級注冊結(jié)構(gòu)工程師,主要從事新型復(fù)雜結(jié)構(gòu)設(shè)計與研究,Email:AG5678@163. com。

[引用本文] 王四清,陳宇,沈蒲生. 加強(qiáng)層彎曲剛度對框架-核心筒結(jié)構(gòu)振動特性影響[ J]. 建筑結(jié)構(gòu),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.