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杜義欣¹，湯榮偉¹，趙鵬飛¹，肖從真¹，潘國(guó)華²
陶    勇²，陽    升¹，郭占一²，李躍林¹
（1 中國(guó)建筑科學(xué)研究院，北京100013；2 中鐵第四勘察設(shè)計(jì)院集團(tuán)有限公司，武漢430063）

[摘要]  武漢站大跨空間結(jié)構(gòu)體系復(fù)雜，以半拱、主拱、斜立柱和V形撐形成的下部結(jié)構(gòu)體系與上部網(wǎng)殼結(jié)構(gòu)互為支撐，成為一個(gè)穩(wěn)定性良好的拱-殼組合體系。該體系中，主拱、半拱等關(guān)鍵構(gòu)件的計(jì)算長(zhǎng)度難以用規(guī)范和現(xiàn)成的理論來確定。通過屈曲分析，研究了網(wǎng)殼對(duì)主拱、半拱穩(wěn)定性能的影響。針對(duì)空間結(jié)構(gòu)支撐體系的屈曲模態(tài)不容易確定的缺陷，通過放大荷載，激發(fā)主拱、半拱屈曲模態(tài)的方法，提出三種確定特殊構(gòu)件計(jì)算長(zhǎng)度的方法，為武漢站結(jié)構(gòu)構(gòu)件設(shè)計(jì)提供了必要的依據(jù)。
[關(guān)鍵詞]  空間結(jié)構(gòu)；穩(wěn)定；屈曲；計(jì)算長(zhǎng)度

    Bulking analysis for the complicated roof and supported structure of Wuban ranvay station
                     Du Yxinl,Tang Rongweil,Zhao Pengfeil,Xao CongZhenl,Pan Guohua2,
                                    Tao Yong2,Yang Shengl,Gu0 2hanyi2'L1 Yuelinl
    (1  China Academy of Building Research ,Beijing 100013 ,China: 2 China Railway Siyuan Survey and Desigp Croup Co. /td. ,Wuhan 430063,China)

Abstract:  The structure of Wuhan railway station is a kind of complicated space structure. The interactive system of the grid roof and the main arch or the half arch is studied in detail. The stability of the system is good. However, the effective length of the critical unit , such as the main arch, the half arch, the declining column or the V branch, is decided difficultly. The buckling analysis is used to decided the effective length of the critical unit and the interactive effect of the supported system and the roof is also  studied. A kind of effective method is put forward to excite the buckling mode of the arch. Three ways are compared to find the effective length of the critical unit. The result is the essential basis of the design for the critical structure unit.
Keywords:  space structure; stability; buckling; effective length