分离双钢箱梁涡激振动气动干扰试验研究

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振动与冲击 ›› 2017, Vol. 36 ›› Issue (18) : 196-201.

论文

分离双钢箱梁涡激振动气动干扰试验研究

刘小兵1,3 陈帅2 杨群2 张海东2 刘庆宽1,3

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Experimental Study on Aerodynamic Interference Effects on Vortex-Induced Vibration of Twin Separate Steel Box Girders

Liu Xiaobing1,3 Chen Shuai2 Yang Qun2 Zhang Haidong2 Liu Qingkuan1,3

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摘要

通过节段模型风洞试验研究了-5° ~ +5°之间8个不同风攻角下分离双钢箱梁在极小间距（D/B=0.025，D为双箱梁的净间距，B为单箱梁宽）、较小间距（D/B=0.1）、中等间距（D/B=0.4）和较大间距（D/B=3.0）时的涡振特性，并将结果与单钢箱梁的结果进行了对比。研究发现：在极小间距和中等间距时，气动干扰放大了上下游箱梁的涡激振动；在较小间距时，双箱梁的涡振特性与来流风攻角密切相关，随着风攻角的逐渐变小，气动干扰对上下游箱梁涡激振动的影响由抑制效应逐渐转变为放大效应; 在较大间距时，上游箱梁对下游箱梁涡激振动存在一定的抑制效应，下游箱梁对上游箱梁涡激振动的影响可以忽略。

Abstract

Vortex-induced vibration characteristics of twin separate steel box girders in 4 different spacings under 7 different wind attacking angles ranging from -5° to +5° were investigated and compared with that of single steel box girder through sectional model wind tunnel tests. The 4 spacings are D/B=0.025（very small spacing），D/B=0.1（comparatively small spacing），D/B=0.4（medium spacing）and D/B=3.0（comparatively large spacing）, where D is net spacing between twin box girders and B is width of single box girder. The test results show that in very small spacing and medium spacing, vortex-induced vibrations of both windward box girder and leeward box girder are amplified. In comparatively small spacing，vortex-induced vibration characteristics of both windward box girder and leeward box girder are close to wind attacking angle. With decreasing of wind attacking angle, aerodynamic interference effect changes from suppression effect to amplification effect gradually. In comparatively large spacing，aerodynamic interference effect on vortex-induced vibration of windward box girder can be neglected. Vortex-induced vibration of leeward box girder is suppressed due to existence of windward box girder.

Key words

twin separate box girders / vortex-induced vibration / aerodynamic interference / wind tunnel test

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刘小兵1,3 陈帅2 杨群2 张海东2 刘庆宽1,3. 分离双钢箱梁涡激振动气动干扰试验研究[J]. 振动与冲击, 2017, 36(18): 196-201

Liu Xiaobing1,3 Chen Shuai2 Yang Qun2 Zhang Haidong2 Liu Qingkuan1,3. Experimental Study on Aerodynamic Interference Effects on Vortex-Induced Vibration of Twin Separate Steel Box Girders[J]. Journal of Vibration and Shock, 2017, 36(18): 196-201

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