桁架结构桥梁静气动系数试验研究

Study on the Static Aerodynamic Coefficients of Truss Girder Bridges

以岳阳洞庭湖二桥为工程背景,进行了节段模型风洞试验,测得桁架梁静力三分力系数和静力两分力系数;根据风洞试验结果分析了桁架主梁静气动系数变化规律,给出顺桥向风荷载的计算公式;将洞庭湖二桥、四渡河大桥以及北盘江特大桥的静力三分力试验结果与国内外规范进行对比分析,为桁架结构主梁气动系数选取提出建议,完善我国抗风规范中关于桁架桥梁静气动力方面的规定,使其更好地应用到设计中,为桁架桥静风荷载的确定提供参考。

A steel truss section model wind tunnel test of the 2nd Dongtinghu Bridge was carried out to obtain the static three-component coefficients and two-component coefficients.The change rules of the static aerodynamic coefficients of the steel truss girder were investigated based on the test results and a formula of the longitudinal wind load was provided.Based on the comparison of the test results of the 2nd Dongtinghu Bridge,Sidu River Bridge and Beipan River Bridge and domestic and overseas codes and standards,some suggestions for determining the static aerodynamic coefficients of truss girder bridges were given,thus perfecting the provisions of truss girder bridge static aerodynamic coefficients in the domestic wind-resistant standards and serving as a reference for the static aerodynamic wind loads on truss girder bridges.