中文摘要：

沧口航道桥（双塔双索面钢箱梁斜拉桥）是青岛海湾大桥的主通航孔桥,为确保其在建成运营后的抗风稳定性、安全性和适用性,对其主梁进行了静风稳定性分析;采用FLUID软件计算主梁静力三分力系数,对主梁节段模型进行静力三分力系数风洞试验（与计算数据相吻合）,然后求解主梁静风扭转发散临界风速,采用ANSYS软件求解其动力特性和主梁的静风横向屈曲临界风速。结果表明：主梁静风扭转发散、横向屈曲临界风速计算最小值分别为579 m/s和745.6 m/s,均远大于检验风速95.8 m/s,因而沧口航道桥主梁的空气静力稳定性能够得到足够保证。

英文摘要：

Cangkou channel bridge,the main navigation of Qingdao gulf bridge,is a double-cable-plane cable-stayed steel box girder bridge with double-tower.Aimed at steel box girder＇aerostatic stability analysis to ensure the stability of the wind-resistance,safety and applicability in the operation of the bridge,FLUID software is used to calculate the coefficient of tri-component force which is consistent with the wind tunnel test data and then to solve its critical wind velocity of static torsional divergence,uses ANSYS to analyze its dynamic behavior and transverse buckling critical wind speed.The calculation shows the minimum values of critical wind velocity are 579 m/s（static torsional divergence） and 745.6 m/s（transverse buckling）.The calculate results are much larger than the corresponding wind speed tests（95.8 m/s）,which guarantee steel box girder＇aerostatics stability in Cangkou channel bridge.6 tabs,6 figs,13 refs.