杜义欣¹，汤荣伟¹，赵鹏飞¹，肖从真¹，潘国华²
陶    勇²，阳    升¹，郭占一²，李跃林¹
（1 中国建筑科学研究院，北京100013；2 中铁第四勘察设计院集团有限公司，武汉430063）

[摘要]  武汉站大跨空间结构体系复杂，以半拱、主拱、斜立柱和V形撑形成的下部结构体系与上部网壳结构互为支撑，成为一个稳定性良好的拱-壳组合体系。该体系中，主拱、半拱等关键构件的计算长度难以用规范和现成的理论来确定。通过屈曲分析，研究了网壳对主拱、半拱稳定性能的影响。针对空间结构支撑体系的屈曲模态不容易确定的缺陷，通过放大荷载，激发主拱、半拱屈曲模态的方法，提出三种确定特殊构件计算长度的方法，为武汉站结构构件设计提供了必要的依据。
[关键词]  空间结构；稳定；屈曲；计算长度

    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