中文摘要：

通过节段模型风洞试验研究了分离双扁平箱梁气动力的干扰效应,得到了气动力系数干扰因子随间距的变化曲线。研究结果表明：上游箱梁阻力系数的干扰效应不明显,下游箱梁阻力系数的干扰效应在D/B≥2（D/B为双箱梁的净间距与单幅箱梁宽之比）时基本可以忽略,在D/B〈2时为减小效应,间距越小,减小效应越显著;下游箱梁升力系数的干扰效应不明显,上游箱梁升力系数的干扰效应在D/B≥2时基本可以忽略,在D/B〈2时为减小效应。

英文摘要：

The interference effect of aerodynamic forces of twin separate flat box girders were investigated by wind tunnel tests of sectional models. The interference-factor changing curves of aerodynamic coefficients versus separate distance were obtained. The research results show that the interference effect of drag coefficient of a forward box girder is slight. The interference effect of drag coefficient of a leeward box girder can be neglected when D/B≥2 and can be recognized as a reducing effect when D/B〈2. This reducing effect is more remarkable for a small distance. The interference effect of lift coefficient of a leeward box girder is slight. The interference effect of lift coefficient of a forward box girder can be neglected when D/B≥2 and can be recognized as a reducing effect when D/B〈2.