中等间距并列双钝体箱梁气动干扰效应试验

发布时间：2018-04-22 10:17

本文选题：并列双钝体箱梁 + 气动干扰　；参考：《振动.测试与诊断》2017年05期

【摘要】：通过节段模型风洞试验研究了中等间距并列双钝体箱梁的气动干扰效应,分析了气动干扰对上下游箱梁三分力系数和涡振的影响。三分力系数试验风攻角的变化范围为-10~10°,双箱梁模型的净间距与单箱梁模型宽之比D/B的变化范围为0.4~1.0。涡振试验风攻角的变化范围为-4~4°,D/B为0.8。研究结果显示:气动干扰对三分力系数的影响主要表现为对下游箱梁的影响,且体现为减小效应;在水平与负攻角来流条件下,气动干扰对上游箱梁涡振的影响较小,对下游箱梁涡振有显著的放大效应;在正攻角来流条件下,气动干扰效应对下游箱梁涡振的影响较小,对上游箱梁涡振有显著的抑制效应。
[Abstract]:The aerodynamic interference effect of a middle distance parallel double blunt body box beam is studied through a segmental model wind tunnel test. The influence of aerodynamic interference on the triple force coefficient and vortex vibration of the upper and lower box beams is analyzed. The variation range of the wind attack angle of the three force coefficient test is -10~10 degrees, and the range of the difference between the net spacing of the double box girder model and the width of the single box beam model is D/B. The variation range of the wind attack angle of the 0.4~1.0. vortex vibration test is -4~4, and the results of D/B as 0.8. show that the influence of aerodynamic interference on the three force coefficient is mainly the effect on the downstream box girder, and the effect is reduced. Under the condition of the horizontal and negative angle of attack, the aerodynamic interference has little influence on the vortex vibration of the upper box beam, and the vortex vibration of the downstream box girder has a little effect. Under the condition of positive angle of attack, the effect of aerodynamic interference on the vortex vibration of the downstream box girder is less, and the vortex vibration of the upper box girder is significantly suppressed.

【作者单位】：石家庄铁道大学大型结构健康诊断与控制研究所;河北省大型结构健康诊断与控制重点实验室;石家庄铁道大学土木工程学院;
【基金】：国家自然科学基金资助项目(51308359,51378323) 河北省高等学校科学技术研究基金资助项目(QN20131169,QN2015213)
【分类号】：U441.3

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