Taking Qinghai Province stadiums for the study object, this paper analyzes the static stability of steel truss-arch by using finite element software. It also takes into account the influence of some factors on it, such as initial defects, the scope of load action, constraint conditions and so on. Based on the squirm modal analysis, using nonlinear finite element method, the basic law of structural stability is analyzed by the whole process deformation-load curve of the structure. The results indicate that initial imperfection has great influence on the static stability of truss-arch; its critical bearing capacity under half span load action is lower than that under the whole span, but the sensitivity of initial defects under half span load action is significantly higher than that under the whole span; increasing support stiffness can appropriately increase the static stability of truss-arch reticulated shell.%以青海省州德令哈市体育场桁架钢拱罩棚结构为研究对象,利用通用有限元软件对桁架拱结构进行了整体稳定性分析,同时考虑了初始缺陷、荷载作用范围及拱脚约束形式等因素对桁架拱结构整体稳定性能的影响.在对结构进行特征值分析的基础上,利用非线性有限元分析方法,通过结构的荷载-位移全过程曲线分析结构稳定性能的基本规律.结果表明:初始缺陷的选取对结构稳定性有较大影响;结构在半跨荷载作用下的稳定性比满跨时略低,在半跨荷载作用下对初始缺陷更为敏感;支座刚度的增大可适当提高拱结构的整体稳定性.
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