- 摘 要
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(同濟(jì)大學(xué)建筑設(shè)計(jì)研究院 (集團(tuán)) 有限公司, 上海 200092)
摘要: 超高層中巨柱的計(jì)算長度取值對整體結(jié)構(gòu)安全性和經(jīng)濟(jì)性有很大影響. 梳理總結(jié)了現(xiàn)有超高層項(xiàng)目框架柱計(jì)算長度求解的常規(guī)方法,并以結(jié)構(gòu)高度 482. 5m 的中國國際絲路中心大廈項(xiàng)目為例,研究了結(jié)構(gòu)自重對屈曲分析初始幾何剛度的影響,對比了單點(diǎn)加載與不同方式多點(diǎn)加載對屈曲臨界荷載計(jì)算結(jié)果的差異,計(jì)算了不同樓板剛度折減系數(shù)下的分區(qū)巨柱的屈曲臨界荷載,分析了不同樓板剛度取值對巨柱計(jì)算長度的影響程度. 通過對比帶彈塑性樓板的整體模型與考慮不同樓板剛度折減系數(shù)的彈性樓板整體模型在罕遇地震下的內(nèi)力分布結(jié)果,得到了巨柱屈曲分析時(shí)考慮樓板塑性變形后的剛度折減系數(shù)建議取值. 最后提出了一種改進(jìn)計(jì)算方法,即通過在整體計(jì)算模型上考慮結(jié)構(gòu)整體自重對幾何剛度的影響,基于多點(diǎn)對稱的荷載施加方式并合理考慮樓板剛度的折減計(jì)算得到巨柱的線彈性屈曲分析結(jié)果,進(jìn)而由歐拉公式反推出巨型柱的計(jì)算長度.
關(guān)鍵詞: 中國國際絲路中心大廈; 超高層建筑; 巨柱; 計(jì)算長度; 屈曲分析; 樓板剛度
中圖分類號:TU318. 1 文獻(xiàn)標(biāo)志碼:A 文章編號:1002-848X(2023)09-0007-09
DOI:10. 19701 / j. jzjg. LS202083
Research on calculation length influencing factors of mega columns of super high-rise structure of China International Silk Road Center Building
DUAN Lian, YU Zhongjun, WANG Jianfeng
(Tongji Architectural Design (Group) Co. , Ltd. , Shanghai 200092, China)
Abstract: The calculation length of mega columns in super high-rise buildings has a great influence on the safety andeconomy of the overall structure. The existing conventional methods for calculation length of frame columns in super highrise projects were summarized. Taking the China International Silk Road Center Building project with the structural heightof 482. 5m as an example, the influence of the structural self-weight on the initial geometric stiffness of the bucklinganalysis was studied. The difference between point loading and multi-point loading in different ways on the buckling criticalload calculation results was compared, and the buckling critical load of the mega columns in different regions underdifferent floor stiffness reduction coefficients was calculated, and the influence of different floor stiffness values on thecalculation length of the mega-columns were analyzed. By comparing the internal force distribution results of the integralmodel with elastic-plastic floor and the elastic floor integral model considering different floor stiffness reduction coefficientsunder rare earthquakes, the suggested value of the stiffness reduction coefficient considering the plastic deformation of thefloor in the buckling analysis of the mega column was obtained. Finally, an improved calculation method was proposed. Theinfluence of the whole body weight of the structure on the geometric stiffness was considered in the overall calculationmodel, and the linear elastic buckling analysis results of the mega column were obtained based on the symmetric multi-pointloading method and reasonable consideration of the reduction of the floor stiffness. Then the calculation length of the megacolumn was derived from the Euler formula.
Keywords:China International Silk Road Center Building; super high-rise building; mega column; calculation length;buckling analysis; floor stiffness
第一作者:段煉,碩士,工程師,主要從事超高層及復(fù)雜建筑結(jié)構(gòu)設(shè)計(jì)與研究,Email:22dl@ tjad. cn.
[引用本文] 段煉,虞終軍,王建峰. 中國國際絲路中心大廈超高層結(jié)構(gòu)巨柱計(jì)算長度影響因素研究[ J]. 建筑結(jié)構(gòu),2023,53(9):7-15. DUAN Lian,YU Zhongjun,WANG Jianfeng. Research on calculation length influencing factors ofmega columns of super high-rise structure of China International Silk Road Center Building[J]. Building Structure,2023,53(9):7-15.
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