中文摘要：

利用通用有限元软件对青海省海西州德令哈市体育场罩棚进行整体稳定性分析，罩棚采用桁架拱结构形式，整体稳定性分析时考虑了初始缺陷、荷载作用范围及拱脚约束形式的影响．先对结构进行特征值分析，然后利用非线性有限元分析方法得出结构受载全过程荷载一位移曲线，以此为基础分析桁架拱结构整体稳定性能的基本规律．结果表明：结构整体稳定性随初始缺陷增大而降低；结构在全跨荷载作用下的稳定性比半跨荷载略高，结构在半跨荷载作用下整体稳定性对初始缺陷更为敏感；结构的整体稳定性随支座刚度的增大而增大．

英文摘要：

By finite element software, the static stability of stadium awning in Qinghai Prounce was analyzed, which is a steel truss-arch. The whole stability analysis took into account the influence of initial defects, the scope of load action and constraint conditions. First the eigenvalue buckling analysis was implencented, then structural stability was analyzed by the obtained whole process deformation-load curve of the structure. The results indicated that static stability of truss-arch decreases with the initial imperfection increasing. Its critical bearing capacity under whole-span load action is higher than that under the half-span, and the sensitivity to initial defects under half-span load action is significantly higher than that under the whole span. Besides, static stability of truss-arch increases with the support stiffness increasing.