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(美國SOM建筑結(jié)構(gòu)事務(wù)所, 芝加哥 60604)
［摘要］對比了在超高層結(jié)構(gòu)分析中較常采用的CEB-FIP-90，fib MC2010以及GL2000模型收縮徐變理論在相同假設(shè)條件下的結(jié)果，有助于工程師了解歐美混凝土收縮徐變理論的最新發(fā)展方向。相較于國內(nèi)在工程中采用較多的CEB-FIP-90模型，GL2000以及fib MC2010模型已經(jīng)將混凝土徐變細(xì)分成基本徐變和干燥徐變。fib MC2010模型更進(jìn)一步將混凝土收縮細(xì)化成基本收縮及干燥收縮。以南寧某帶有外伸桁架的巨柱外框超高層地標(biāo)塔樓為例，按不同混凝土收縮徐變理論進(jìn)行非線性施工分析，對施工期間的豎向構(gòu)件的豎向補(bǔ)償提出建議，并預(yù)測了施工完畢后若干年的核心筒和巨柱的豎向變形、軸力隨時(shí)間的變化，以及與時(shí)間相關(guān)的樓板系統(tǒng)的傾斜變化趨勢。
［關(guān)鍵詞］超高層結(jié)構(gòu)； 外伸桁架； CEB-FIP-90； fib MC2010； GL2000； 非線性施工分析； 施工補(bǔ)償； 豎向變形
中圖分類號：TU375文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2019)17-0090-08
Numerical comparison and application of latest European and American creep and shrinkage theories
Chen Jin, Ding Han, Dane Rankin, Li Zhe
(Skidmore, Owings & Merrill LLP, Chicago 60604, U.S.A)
Abstract:The results of the concrete creep and shrinkage theories in CEB-FIP-90, fib MC2010 and GL2000 models, which were widely applied in super tall structural analysis, were compared under the same assumption conditions. This could help engineers to better understand the latest research directions of European and American concrete creep and shrinkage theories. Compared with the more commonly used CEBFIP-90 model in China, GL2000 model and fib MC2010 model differentiate the concrete creep into basic creep and drying creep. Furthermore, fib MC2010 model divides the concrete shrinkage into basic shrinkage and drying shrinkage. Taking a mega-frame super-tall landmark tower building in Nanning as an example, nonlinear construction sequence analysis was conducted based on different concrete shrinkage and creep theories. Suggestions were put forward for vertical compensation of vertical components during construction, and predicted the vertical deformation of corewall and mega-frame in several years after completion of construction, the change of axial force of corewall and mega-frame over time. And the inclination trend of floor system related to time was also predicted.
Keywords:super-tall building structure; outrigger truss; CEB-FIP-90; fib MC2010; GL2000; nonlinear construction sequence analysis; construction compensation; vertical deformation
作者簡介：陳晉，碩士，SOM結(jié)構(gòu)副總監(jiān)，美國注冊結(jié)構(gòu)工程師，注冊職業(yè)工程師，Email: jin.chen@som.com。
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