并列双钝体箱梁间距对涡激共振特性的影响
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摘要
首先通过节段模型风洞试验测试了并列双幅钝体箱梁在10个不同间距(双幅箱梁的净间距D与单幅箱梁宽B之比D/B的变化范围为0.2～4.0)时的涡激共振振幅与风速锁定区间,并与单幅钝体箱梁的的涡激共振振幅与风速锁定区间进行了对比,研究了对并列双幅钝体箱梁的间距对涡激共振特性的影响。然后基于CFD数值计算结果,从流场的角度对涡激共振特性的影响机理进行了分析。研究结果表明:下游箱梁对上游箱梁涡激共振的影响在0.2≤D/B≤2.0时表现为一定的放大效应,在D/B≥2.5时基本可以忽略;上游箱梁对下游箱梁涡激共振的影响表现为明显的放大效应,这种放大效应在D/B=0.8时最显著,即使当D/B=4.0时仍不可忽略。
The wind tunnel tests of sectional models for twin parallel bluff-box girders were performed firstly.Vortex-induced vibration amplitude and wind velocity locking region of twin parallel box girders in 10 different spaces were investigated and compared with those of single box girders. The space ratio of D/B is from 0.2 to 4.0,where D is net space between twin box girders and B is width of a single box girder. Then the influencing mechanism of vortex-induced vibration was studied based on flow fields attained from CFD numerical calculation. The study results show that the influence of a leeward box girder on the vortex-induced vibration of a forward box girder is shown as an amplification effect when 0.2≤D/B≤2.0 and can be ignored when D/B≥2.5.The influence of a forward box girder on the vortex-induced vibration of a leeward box girder is shown as a notably amplification effect. The amplification effect is the most significant when D/B=0.8 and cannot be neglected even when D/B=4.0.
The wind tunnel tests of sectional models for twin parallel bluff-box girders were performed firstly.Vortex-induced vibration amplitude and wind velocity locking region of twin parallel box girders in 10 different spaces were investigated and compared with those of single box girders. The space ratio of D/B is from 0.2 to 4.0,where D is net space between twin box girders and B is width of a single box girder. Then the influencing mechanism of vortex-induced vibration was studied based on flow fields attained from CFD numerical calculation. The study results show that the influence of a leeward box girder on the vortex-induced vibration of a forward box girder is shown as an amplification effect when 0.2≤D/B≤2.0 and can be ignored when D/B≥2.5.The influence of a forward box girder on the vortex-induced vibration of a leeward box girder is shown as a notably amplification effect. The amplification effect is the most significant when D/B=0.8 and cannot be neglected even when D/B=4.0.
引文
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[8]刘志文,陈政清,栗小祜,等.串列双流线型断面涡激振动气动干扰试验[J].中国公路学报,2011,24(3):51-57.Liu Zhiwen, Chen Zhengqing, Li Xiaohu,et al.Aerodynamic interference test on vortex induced vibration of two streamline cylinders in tandem[J].China Journal of Highway and Transport, 2011,24(3):51-57.(in Chinese)
[9]刘小兵,李少杰,战胜斌等.中等间距并列双钝体箱梁气动干扰效应试验[J].振动、测试与诊断,2017,37(5):1046-1051.Liu Xiaobing,Li Shaojie,Zhang Shengbin, et al.Experimental study on aerodynamic interference effects of twin parallel box griders with bluff body in medial distance[J]. Journal of vibration,measurement&diagnosis,2017, 37(5):1046-1051.(in Chinese)
[10]刘小兵,李少杰,陈帅等.大间距并列双钝体箱梁气动干扰效应试验研究[J].世界桥梁,2018, 46(2):35-40.Liu Xiaobing, Li Shaojie, Chen Shuai, et al.Experimental study of aerodynamic interference effects of twin parallel bluff box griders with large intervals[J].World Bridges,2018, 46(2):35-40.(in Chinese)
[11]秦浩,廖海黎,李明水.大跨度双幅连续钢箱梁桥涡激振动特性风洞试验研究[J].振动与冲击,2014,33(14):206-210.Qin Hao,Liao Haili, Li Mingshui. Vortex induced vibration performance of long span continuous steel twin box beam bridge based on wind tunnel test[J]. Journal of vibration and Shock, 2014, 33(14):206-210.(in Chinese)
[2] Kimura K, Shima K, Sano K, et al. Effects of seperation distance on wind-induced response of parallel box girders[J]. Journal of Wind Engineering and Industrial Aerodynamics, 2008, 96(6/7):954-962
[3]朱乐东,周奇,郭震山,等.箱形双幅桥气动干扰效应对颤振和涡振的影响[J].同济大学学报,2010, 38(5):632-638.Zhu Ledong, Zhou Qi, Guo Zhenshan, et al.Aerodynamic interference effects on flutter and vortex-excited resonance of bridges with twin-separateparallel box decks[J]. Journal of Tongji University, 2010,38(5):632-638.(in Chinese)
[4]郭震山,孟晓亮,周奇,等.既有桥梁对邻近新建桥梁三分力系数的气动干扰效应[J].工程力学,2010,27(9):181-186.Guo Zhenshan, Meng Xiaoliang Zhou Qi,et al.Aerodynamic interferences of an existed bridge on aerodynamic coefficients of an adjacent new bridge[J].Engineering Mechanics, 2010,27(9):181-186.(in Chinese)
[5]刘小兵,李少杰,杨群,等.气动干扰对分离双扁平箱梁三分力系数的影响[J].桥梁建设,2017,47(5):53-58.Liu Xiaobing, Li Shaojie,Yang Qun, et al. Influences of aerodynamic interference on three-component coefficients of separated twin flat box girders[J]. Bridge Construction, 2017, 47(5):53-58.(in Chinese)
[6]刘小兵,张海东,刘庆宽.大攻角下分离双钢箱梁间距对涡振特性的影响[J].振动与冲击,2017, 36(14):202-207, 233.Liu Xiaobing, Zhang Haidong, Liu Qingkuan. Influence of the spacing on vortex-induced vibration characteristics of twin separate steel box girders under a large wind attacking angle[J]. Journal of Vibration and Shock,2017, 36(14):202-207, 233.(in Chinese)
[7]刘小兵,陈帅,杨群,等.分离双钢箱梁涡激振动气动干扰实验研究[J].振动与冲击,2017, 36(18):196-201.Liu Xiaobing, Chen Shuai, Yang Qun, et al. Experimental study on aerodynamic interference effects on the vortex-induced vibration of twin separate steel box griders[J]. Journal of vibration and shock, 2017, 36(18):196-201.(in Chinese)
[8]刘志文,陈政清,栗小祜,等.串列双流线型断面涡激振动气动干扰试验[J].中国公路学报,2011,24(3):51-57.Liu Zhiwen, Chen Zhengqing, Li Xiaohu,et al.Aerodynamic interference test on vortex induced vibration of two streamline cylinders in tandem[J].China Journal of Highway and Transport, 2011,24(3):51-57.(in Chinese)
[9]刘小兵,李少杰,战胜斌等.中等间距并列双钝体箱梁气动干扰效应试验[J].振动、测试与诊断,2017,37(5):1046-1051.Liu Xiaobing,Li Shaojie,Zhang Shengbin, et al.Experimental study on aerodynamic interference effects of twin parallel box griders with bluff body in medial distance[J]. Journal of vibration,measurement&diagnosis,2017, 37(5):1046-1051.(in Chinese)
[10]刘小兵,李少杰,陈帅等.大间距并列双钝体箱梁气动干扰效应试验研究[J].世界桥梁,2018, 46(2):35-40.Liu Xiaobing, Li Shaojie, Chen Shuai, et al.Experimental study of aerodynamic interference effects of twin parallel bluff box griders with large intervals[J].World Bridges,2018, 46(2):35-40.(in Chinese)
[11]秦浩,廖海黎,李明水.大跨度双幅连续钢箱梁桥涡激振动特性风洞试验研究[J].振动与冲击,2014,33(14):206-210.Qin Hao,Liao Haili, Li Mingshui. Vortex induced vibration performance of long span continuous steel twin box beam bridge based on wind tunnel test[J]. Journal of vibration and Shock, 2014, 33(14):206-210.(in Chinese)