首都國際機場T3航站樓交通中心鋼結(jié)構(gòu)體系穩(wěn)定分析
朱忠義，柯長華，秦凱，王毅，束偉農(nóng)
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(北京市建筑設(shè)計研究院，100045)［提要］以首都國際機場交通運輸中心(GTC)大跨箱型鋼拱結(jié)構(gòu)為工程背景，以單拱、組拱和整體屋蓋鋼拱結(jié)構(gòu)為研究對象，采用非線性有限元法分析結(jié)構(gòu)失穩(wěn)問題。在多種不利荷載組合作用下，研究對應(yīng)于GTC鋼結(jié)構(gòu)體系的理想結(jié)構(gòu)整體穩(wěn)定性能并得出結(jié)構(gòu)特征屈曲系數(shù)的基礎(chǔ)上，考慮幾何非線性、材料非線性，按最不利原則施加初始幾何缺陷，計算結(jié)構(gòu)的非線性穩(wěn)定屈曲系數(shù)，獲得相應(yīng)的折減系數(shù)，并討論了雙重非線性對結(jié)構(gòu)整體穩(wěn)定的影響。同時，數(shù)值分析了主拱拱腳處腹板的局部穩(wěn)定問題，結(jié)果說明，在拱腳處需合理設(shè)置加勁肋板來避免腹板局部失穩(wěn)。［關(guān)鍵詞］首都機場；大跨鋼拱結(jié)構(gòu)；整體穩(wěn)定；屈曲；組拱Stability Analysis of Terminal 3"s Ground Transportation Center of Beijing Capital International Airport/Zhu Zhongyi, Ke Changhua, Qin Kai, Wang Yi, Shu Weinong (Beijing Institute of Architectural Design, Beijing 100045,China)Abstract:The structural instability problems are analyzed through nonlinear finite element method, taking single arch, multiple arch and complete steel arch roof as research objects, using the large span steel box section arch in Ground Transportation Center(GTC) of Beijing Capital International Airport as background. The research deals with ideal complete stability properties of the GTC steel strucuure system, and gets structural characteristic buckling factor under multiple kinds of worst load combinations. In addition, it calculates structural nonlinear stability buckling factor, and corresponding reduction factors,discusses the influence of structural complete stability due to binonlinear,considering geometric and material nonlinear, and initial geometric imperfection under worst principle. Using numerical method to analyze web local stability problem at the foot of main arch, it concludes that board stiffening rib should be built appropriately at the foot of arch, in order to avoid web local instability.Keywords:Beijing Capital International Airport; large span steel arch structural; complete stability; buckling; multiple arch*北京市科技新星項目。
