中文摘要：

采用几何缩尺比为1：40的节段模型，进行天兴州公铁两用大桥气动参数的风洞试验，测量其主桁梁和列车的静力三分力系数、桁梁的气动导数。分析上、下游不同方向来流，桥上有无列车，列车不同位置和不同队列数等对桁梁和列车三分力系数的影响。在均匀流条件下，用自由振动法测量气动导数，采用加权整体最小二乘法对桁梁气动导数进行识别。分析表明：天兴州公铁两用大桥主梁断面具备气动稳定的必要条件；上游来流和下游来流的三分力系数差别不大，小攻角时差别更小；列车在下风侧时的桁梁三分力系数较列车在上风侧时大；列车在桥上运行时，会增大桁梁的升力系数和力矩系数，降低桁梁的阻力系数。

英文摘要：

With the section model in scale of 1 ： 40, the section model wind tunnel test on the aerodynamic parameters was performed. The aerodynamic parameters, which are static aerodynamic coefficients of the girder and of the train and the flutter derivatives of the girder of Tianxingzhou highway-railway bridge, were obtained. The wind attacks in direction of downstream or upstream, girder with or without train, trains on different lines, trains passing through in different queue were taken into account and their effects on three aerostatic coefficients were discussed. The flutter derivatives of the girder were identified by Weighting Ensemble Least-Square method （WELS）. It is shown, the essential requirements for aerodynamic stabilization is satisfied for the section girder of Tianxingzhou highway-railway bridge. The static aerodynamic coefficients of the girder almost has no difference when the wind comes with the direction of downstream or upstream with a small attack angle. The three aerostatic coefficients are larger when the train is on leeward side of deck than on windward side of deck, the lift coefficients and pitch coefficients of girder are raised when train passing though the bridge but the drag coefficients are reduced.