中央稳定板对分体箱梁桥梁的涡振控制
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摘要
以一座分体箱梁桥梁为背景,通过计算流体动力学(CFD)数值模拟和节段模型风洞试验,分别对上、下中央稳定板作用于分体箱梁的涡振控制效果展开研究.发现随着中央稳定板高度的增加,竖向涡振性能都是先变好再变差,分别在0.4倍梁高上稳定板时和0.2倍梁高下稳定板时竖向涡振振幅最小;增设上稳定板时加大了扭转涡振振幅,而下稳定板明显减小了扭转涡振振幅.CFD模拟的涡度场和压强场对比还表明,中央稳定板改变了槽中漩涡的运动方式和下风侧两端上下表面的压强,从而明显改变了竖向涡振的振幅.综合结果发现,0.2倍梁高下稳定板的涡振控制效果最好,而0.8倍梁高上稳定板的涡振控制效果最不利.
Taking a twin-box girder bridge with a slot width ratio of 20% as an example, the control effects of upward vertical central stabilizers(UVCS) and downward vertical central stabilizers(DVCS) on the bridge were investigated using CFD simulation and a series of wind tunnel tests, respectively. The results show that the amplitudes of heaving vortex-induced vibration(VIV) responses first increase and then decrease with the height increase of vertical central stabilizers, in which the amplitudes of heaving VIV responses for the UVCS with 0.4h/H and the DVCS with 0.2h/H were the smallest. The amplitudes of torsional VIV responses were enhanced by installing the UVCS while the DVCS are helpful to decrease the torsional responses. In addition, the results of the CFD numerical simulation show that VCS change the motion mode of vortex structures in the slotting and the pressure zones on the upper and bottom surface of the leeward side girder. It is found that the optimal control effective on the VIV performance is the DVCS with 0.2h/H, whereas the UVCS with 0.8h/H has the worst effective of all cases.
Taking a twin-box girder bridge with a slot width ratio of 20% as an example, the control effects of upward vertical central stabilizers(UVCS) and downward vertical central stabilizers(DVCS) on the bridge were investigated using CFD simulation and a series of wind tunnel tests, respectively. The results show that the amplitudes of heaving vortex-induced vibration(VIV) responses first increase and then decrease with the height increase of vertical central stabilizers, in which the amplitudes of heaving VIV responses for the UVCS with 0.4h/H and the DVCS with 0.2h/H were the smallest. The amplitudes of torsional VIV responses were enhanced by installing the UVCS while the DVCS are helpful to decrease the torsional responses. In addition, the results of the CFD numerical simulation show that VCS change the motion mode of vortex structures in the slotting and the pressure zones on the upper and bottom surface of the leeward side girder. It is found that the optimal control effective on the VIV performance is the DVCS with 0.2h/H, whereas the UVCS with 0.8h/H has the worst effective of all cases.
引文
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[2] UEDA T,YASUDA M,NAKAGAKI R.Mechanism of aerodynamic stabilization for long-span suspension bridge with stiffening truss-girder [J].Journal of Wind Engineering and Industrial Aerodynamics,2000,33(1/2):333.
[3] 杨詠昕,周锐,葛耀君.大跨度桥梁实用颤振控制方法研究[J].同济大学学报(自然科学版),2014,42(7):989.YANG Yongxin,ZHOU Rui,GE Yaojun.Practical flutter control method for long-span bridges [J].Joural of Tongji University(Natural Science),2014,42(7):989.
[4] 赵林,葛耀君,郭增伟,等.大跨度缆索承重桥梁风振控制回顾与思考——主梁被动控制效果与主动控制策略[J].土木工程学报,2015,48(12):91.ZHAO Lin,GE Yaojun,GUO Zengwei,et al.Reconsideration of wind-induced vibration mitigation of long-span cable supported bridges:effects of passive control and strategy of active control[J].China Civil Engineering Journal,2015,48(12):91.
[5] 杨詠昕,周锐,葛耀君.大跨度分体箱梁桥梁的涡振性能及其控制[J].土木工程学报,2014,47(12):107.YANG Yongxin,ZHOU Rui,GE Yaojun.Vortex-induced vibration and its control for long-span bridges with twin box girder[J].China Civil Engineering Journal,2014,47(12):107.
[6] 杨詠昕,周锐,罗东伟,等.不同槽宽分体箱梁的涡振及其控制措施[J].工程力学,2017,34(7):30.YANG Yongxin,ZHOU Rui,LUO Dongwei,et al.Vortex-induced vibration and its control for twin-box girder bridges with various slot widths [J].Engineering Mechanics,2017,34(7):30.
[7] LARSEN A,ESDAHL Y,ANDERSEN J E,et al.Storebelt suspension bridge vortex shedding excitation and mitigation by guide vanes[J].Journal of Wind Engineering and Industrial Aerodynamics,2000,88(2/3):283.
[8] 许福友,丁威,姜峰,等.大跨度桥梁涡激振动研究进展与展望[J].振动 与冲 击,2010,29(10) :40.XU Fuyou,DING Wei,JIANG Feng,et al.Development and prospect of study on vortex-induced vibration of long-span bridges [J].Journal of Vibration and Shock,2010,29(10):40.
[9] ZHOU R,YANG Y X,GE Y J,et al.Practical countermeasures for the aerodynamic performance of long span cable-stayed bridge with open deck [J].Wind and Structures,2015,21(2):223.
[10] 方根深,杨詠昕,葛耀君,等.半开口分离双箱梁涡振性能及其气动控制措施研究[J].土木工程学报,2017,50(3):74.FANG Genshen,YANG Yongxin,GE Yaojun,et al.Vortex-induced vibration performance and aerodynamic countermeasures of semi-open separated twin-box deck [J].China Civil Engineering Journal,2017,50(3):74.
[11] YANG Y X,ZHOU R,GE Y J,et al.Flutter characteristics of twin-box girder bridges with vertical central stabilizers [J].Engineering Structures,2017,133:33.
[12] 欧阳克俭,陈政清.中央稳定板提高颤振稳定性能的细观作用机理[J].振动与冲击,2016,35(1):11.OUYANG Kejian,CHEN Zhengqing.Micro-mechanism of a central stabilizer for improving a bridge's flutter stability[J].Journal of Vibration and Shock,2016,35(1):11.
[13] YANG Y X,ZHOU R,GE Y J,et al.Aerodynamic instability performance of twin-box girder for long-span bridges [J].Journal of Wind Engineering and Industrial Aerodynamics,2015,145:196.
[14] 张伟,魏志刚,杨詠昕,等.基于高低雷诺数试验的分离双箱涡振性能对比[J].同济大学学报(自然科学版),2008,36(1):6.ZHANG Wei,WEI Zhigang,YANG Yongxin,et al.Comparison and analysis of vortex induced vibration for twin-box bridge sections based on experiments in different reynolds numbers [J].Journal of Tongji University(Natural Science),2008,36(1):6.
[15] 刘十一.大跨度桥梁非线性气动力模型和非平稳全过程风致响应[D].上海:同济大学,2014.LIU Shiyi.Non-linear aerodynamic model and non-stationary whole-process wind response of long-span bridges [D].Shanghai:Tongji University,2014.
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