青岛海湾大桥沧口航道桥静风稳定性分析  

Aerostatic Stability Analysis of Cangkou Shipping Channel Bridge of Qingdao Bay Bridge

作　　者：李利军[1] 胡兆同[1] 曲立清 

机构地区：[1]长安大学公路学院,陕西西安710064 [2]青岛国信投资股份有限公司,山东青岛266000

出　　处：《桥梁建设》2010年第6期33-36,共4页Bridge Construction

基　　金：国家自然科学基金项目(50808018)

摘　　要：青岛海湾大桥沧口航道桥为双塔双索面钢箱梁斜拉桥。为确保该桥在建成运营后的抗风稳定性及安全性,对其进行静风稳定性分析。采用Fluid计算该桥静力三分力系数,然后采用ANSYS计算其结构动力特性,进而得出该桥整体抗扭刚度和静风扭转发散临界风速,再采用AN-SYS按线性稳定性方法计算其静风横向屈曲临界风速。计算结果表明:沧口航道桥成桥状态的1阶扭弯频率比大于2.0,具有良好的抗风性能;上、下风侧主梁结构静风扭转发散临界风速和横向屈曲临界风速均大于检验风速,空气静力稳定性能够得到保证。The Cangkou Shipping Channel Bridge of Qingdao Bay Bridge is a steel box girder cable-stayed bridge with double pylons and double cable planes. To ensure the wind stability and safety of the bridge after the bridge was completed and put into operation, the aerostatic stability analysis of the bridge was made. The Fluid software was firstly used to calculate the static triple-component coefficients of the bridge and the ANSYS software was then used to calculate the structural dynamic behavior. The global torsion rigidity and the critical wind speed of aerostatictorsion shedding of the bridge were obtained. The ANSYS software was again used to calculate the critical wind speed of aerostatic lateral buckling in accordance with the linear stability meth-od. The results of the calculation indicated that the 1st order of the torsion-bending frequency of the completed bridge status was greater than 2.0 and the bridge had good wind resistance perormance. The critical wind speed of both the aerostatic torsion shedding and aerostatic lateral buckling of the main girder on the windward and leeward sides was greater than the checked windspeed and the aerostatic stability of the bridge could be amply ensured.

关 键 词：斜拉桥 钢梁 箱形梁 风荷载 稳定性 

分 类 号：U311.2[交通运输工程]