并列双幅变截面箱梁阻力系数的干扰效应研究

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摘要基于节段模型风洞试验，对比研究了4种不同高宽比的并列双幅箱梁在不同风攻角和不同间距时的阻力系数与单箱梁阻力系数的差异。给出了阻力系数干扰因子（定义为双箱梁上游（或下游）箱梁阻力系数与单箱梁阻力系数的比值）随风攻角和间距变化规律。结果表明：上游箱梁阻力系数的干扰效应主要体现在 D/B ≤1的间距范围。高宽比对上游箱梁阻力系数干扰效应的影响不大。当0.025≤ D/B ≤1，风攻角为-10°~10°时，上游箱梁阻力系数干扰因子的变化范围为0.8~1.3左右；下游箱梁阻力系数的干扰效应表现为显著的减小效应。这种减小效应随着间距的减小和高宽比的增大愈发明显，与负向风攻角时相比，这种减小效应在正向风攻角时更明显。

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	刘小兵1
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	吴倩云4
	路起凡4
	刘慧杰4
	杨群3
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关键词 ：双幅变截面箱梁, 风洞试验, 阻力系数, 干扰因子, 间距, 风攻角

Abstract：

Wind tunnel tests of sectional models of twin parallel box girders with four different aspect ratios were performed.Drag coefficients of twin box girders in different spacings under different wind attacking angles were measured and compared with that of single box girder.Variation of interference factor which is defined as ratio of drag coefficients of twin box girders to that of single box girder with wind attacking angle and spacing were shown.The results show that interference effect on drag coefficient of forward box girder is noticeable only when D/B ≤1 and is slightly affected by aspect ratio.Interference effect on drag coefficient of leeward box girder is obvious and shown as reducing effect.The reducing effect is more notable in small spacing and large aspect ratio.The reducing effect under positive wind attacking angles is more remarkable than that under negative wind attacking angles.

Key words： :twin box girders with variable cross section')" href="#">

:twin box girders with variable cross section wind tunnel test drag coefficient interference factor spacing wind attacking angle

收稿日期: 2019-02-28 出版日期: 2020-05-15

引用本文:

刘小兵1,2,3，吴倩云4，路起凡4，刘慧杰4，杨群3,4 . 并列双幅变截面箱梁阻力系数的干扰效应研究[J]. 振动与冲击, 2020, 39(10): 148-153.
LIU Xiaobing1,2,3,WU Qianyun4,LU Qifan4,LIU Huijie4,YANG Qun3,4. Study on interference effect on drag coefficient of twin parallel box girders with variable cross section. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(10): 148-153.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2020/V39/I10/148

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