气动干扰对分离双扁平箱梁三分力系数的影响

发布时间：2019-03-29 19:52

【摘要】：为研究分离双主梁间距及风攻角对分离双扁平箱梁三分力系数气动干扰效应的影响,制作缩尺比为1∶50的分离双扁平箱梁节段模型,进行风洞试验。测试-10°~10°风攻角范围内分离双扁平箱梁在15个不同间距(双箱梁的净间距D与单幅箱梁宽B之比的变化范围为0.025~6)下的三分力系数,并与单幅扁平箱梁的三分力系数进行对比。结果表明:气动干扰对分离双扁平箱梁三分力系数的影响主要表现为对下游箱梁的影响。对阻力系数而言,这种影响主要体现在D/B≤1的间距范围,且表现为减小效应;对升力系数而言,这种影响主要体现在负向风攻角,且表现为减小效应;对扭矩系数而言,这种影响主要体现在大风攻角,在正向和负向大风攻角时分别表现为放大效应和减小效应。
[Abstract]:In order to study the influence of the distance between the two beams and the angle of attack on the aerodynamic interference effect of the three-component force coefficient of the separated double-flat box girder, a model of the separated double-flat box beam with a scale ratio of 1:50 was made and the wind tunnel tests were carried out. In the range of-10 掳- 10 掳angle of attack, the three-component force coefficient of the separated double flat box girder under 15 different spacing (the ratio of the net spacing D of the double box girder to the width B of the single box girder is 0.025 脳 6) is measured, and the three-component force coefficient of the separated double flat box girder is measured in the range of-10 掳to 10 掳. The three-component force coefficient of the flat box girder is compared with that of the single flat box girder. The results show that the influence of aerodynamic interference on the three-component force coefficient of the separated double flat box girder is mainly the influence on the downstream box girder. As far as the drag coefficient is concerned, the effect is mainly reflected in the distance between D _ (B) 鈮，

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