随州南站屋盖结构设计和分析

Structural analysis and design on roof of Suizhou South Railway Station

随州南站站房采用24个伞状单元体呈现银杏叶的造型,结构设计时以H形截面弦杆形成的异形钢桁架作为主受力骨架,结合分叉圆钢管、吊杆、水平圆管桁架等形成完整单元体结构。单元体结构与顶部波浪形正交钢梁体系连接,形成了站房屋盖整体结构。屋盖结构体系复杂,单元体根部尺寸收缩,采用屈曲分析得到了结构的屈曲模态及屈曲因子,第一阶屈曲模态位于伞状单元体结构根部位置,并进一步对屋盖结构进行了荷载-位移全过程分析,以保证屋盖结构的整体承载力。设计时在单元体结构中采用了十字工形组合钢柱及鼓形节点,利用有限元分析和试验的手段对此两种特殊结构构造进行了验证,以确保关键部位的承载力。单元体结构外表皮采用张拉索-膜结构形成的金黄色ETFE膜完整呈现了建筑效果。

The station building of Suizhou South Railway Station adopts 24 umbrella-shaped elements,which are in the shape of ginkgo leaves.In the structural design,the special-shaped steel truss formed by the H-section chord is used as the main stress skeleton,combined with the bifurcated round steel pipe,the suspension rod,the horizontal circle tube trusses,etc.to form a complete element structure.The element structure is connected with the top wave-shaped orthogonal steel beam system to form the overall structure of the station building.The roof structure system is complex,and the size of the root of the element shrinks.The buckling mode and buckling factor of the structure were obtained by buckling analysis.The first-order buckling mode was located at the root of the umbrella-shaped element structure,and the whole process of load-displacement analysis of the roof structure was carried out to ensure the overall bearing capacity of the roof structure.In the design,the cross-shaped and I-shaped composite steel columns and drum-shaped joints were used in the element structure,and the two special structure details were verified by means of finite element analysis and test to ensure the bearing capacity of key parts.The outer facade of the element structure adopts the golden yellow ETFE film formed by the tension cable-membrane structure to completely present the architectural effect.