中国(淮安)国际食品博览中心A区大跨度屋盖结构设计

Structural design of large-span roof in Area A of China (Huai’an) International Food Expo Center

结合中国(淮安)国际食品博览中心建筑造型及使用功能,通过对屋盖结构的用钢量、刚度、美观性、制作与安装四个方面进行方案比选,确定屋盖采用正交平面桁架结构体系。为减小温度及地震作用的影响,对塔1顶部支座进行了三种约束条件的比选,最终采用X向单向滑动球形钢支座。采用SAP2000软件对结构进行建模计算,在各个荷载工况及组合下对结构进行分析,得到了结构的静力及动力响应,结构各项指标均满足设计要求。采用Perform 3D软件对结构进行动力弹塑性时程分析,结果表明,结构在罕遇地震下的损伤程度符合设计要求。对屋盖结构进行了抗连续倒塌验算,进一步确保了结构的安全冗余度。

Combined with the architectural modeling and use function of China(Huai’an) International Food Expo Center, the orthogonal in-plane truss structural system was selected for the roof structure through the comparison of four aspects, including steel consumption, rigidity, aesthetics, fabrication and installation. In order to minimize the influence of temperature and seismic action, three kinds of restraint conditions were compared and selected for the top bearing of tower 1. Finally, the X-direction unidirectional sliding spherical steel bearing was adopted. SAP2000 software was used to model and analyze the structure, and the static and dynamic responses of the structure were obtained under various load cases and combinations. All indexes of the structure met the design requirements. The dynamic elastoplastic time-history analysis of the structure was carried out by using perform 3 D software. The results show that the damage degree of the structure under rare earthquakes meets the design requirements. The anti-progressive collapse checking was conducted on the roof structure to further ensure the safety redundancy of the structure.