石家庄国际会展中心双向悬索结构整体稳定性分析

石家庄国际会展中心项目建筑造型新颖别致，富有艺术表现力，结构体系复杂，采用了双向悬索结构体系，其中纵向主承重采用自锚式悬索结构，横向次承重采用双层索桁架结构，传力方式特殊,为增大屋盖平面内刚度，还设有水平交叉支撑。以石家庄国际会展中心C厅结构为研究对象，进行了线性屈曲和非线性屈曲分析。研究了初始缺陷分布模式、荷载分布形式以及初始缺陷值的大小对结构整体稳定的影响。研究表明：初始缺陷的分布模式对石家庄国际会展中心结构的整体承载力影响不大；荷载分布形式对结构的整体承载力有较大的影响；初始缺陷值在结构跨度的1/300以内时，结构整体承载力损失不大，但当其增大至1/100结构跨度时，结构的整体承载力显著下降；该结构具有良好的整体稳定性，线性屈曲及双重非线性荷载因子均满足规范要求。

Overall stability analysis of two-way suspension structure ofShijiazhuang International Convention and Exhibition Center

The entire building of the Shijiazhuang International Exhibition Centre project is ascetically novel, distinctive and structurally creative. It has a complicated load carrying system. The vertical load is sustained in the form of a self-anchored cable suspended structure and the horizontal load carrying system adopts a double-layer cable truss structure which has special force transmission mode. In order to increase the stiffness of the roof plane，horizontal cross support is also provided. In the analysis，the structure of Hall C of Shijiazhuang International Convention and Exhibition Center was considered as the research object，where linear buckling and nonlinear buckling analysis were conducted. The influences of the initial defect layout, load distribution and the initial imperfection value on the overall stability of the structure were studied and compared. The results show that the layout of the initial imperfections is insensitive to the overall stability，and the load distribution form has a significant influence on the overall bearing capacity of the structure. When the initial imperfection amplitude is within 1/300 of the structural span，the overall bearing capacity loss is not significant, but when the value increases to 1/100，the overall bearing capacity of the structure decreases significantly. The structure has good overall stability, and both the linear and nonlinear critical buckling capacity satisfy the codified requirements.