车辆激励下中央扣对悬索桥梁端位移的影响
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摘要
为研究中央扣对悬索桥梁端位移的影响,以洞庭湖二桥为工程背景,考虑结构几何非线性效应,建立相应的全桥空间有限元动力模型.基于有限元模型,考虑多种行车工况,研究了中央扣对该桥动力特性及在车辆激励下对梁端位移的影响.结果表明:中央扣能显著提高悬索桥的整体纵向刚度,改变悬索桥的纵飘模态特性.在车辆激励下,设置中央扣明显减小了加劲梁的纵向振幅,提高了加劲梁的振动频率,导致梁端累加位移值增大.双向行驶的车辆越多,增设中央扣后梁端位移峰值减小得越明显.不同类型的中央扣造成悬索桥对应的共振车速和主梁的动力响应各不相同.行车工况下,不同类型中央扣对梁端位移的控制效果各有差别.
In this study,the Dongting Lake Bridge II was chosen as engineering background to investigate the effects of the central buckle on the end displacement of suspension girder. Considering the geometric nonlinear effect,three finite element models of the suspension bridge were established. Based on the FE model and considering multiple driving conditions, the effect of central buckle on the dynamic characteristic of the suspension bridge and end displacement under vehicle excitation was investigated. It is shown that the central buckle can significantly increase the stiffness of the suspension bridge,and it seems to govern the longitude modal displacement at the end of the girder. Moreover, the transient analysis was performed to investigate the vehicle-induced dynamic response of the suspension bridge. Furthermore, the effects of the central buckle on the longitude modal displacement in the end of girder were evaluated. The results show that the central buckle can be designed to decrease the peak value of the dynamic response of the girder. However, it increases the cumulative displacement at the end of the girder.
In this study,the Dongting Lake Bridge II was chosen as engineering background to investigate the effects of the central buckle on the end displacement of suspension girder. Considering the geometric nonlinear effect,three finite element models of the suspension bridge were established. Based on the FE model and considering multiple driving conditions, the effect of central buckle on the dynamic characteristic of the suspension bridge and end displacement under vehicle excitation was investigated. It is shown that the central buckle can significantly increase the stiffness of the suspension bridge,and it seems to govern the longitude modal displacement at the end of the girder. Moreover, the transient analysis was performed to investigate the vehicle-induced dynamic response of the suspension bridge. Furthermore, the effects of the central buckle on the longitude modal displacement in the end of girder were evaluated. The results show that the central buckle can be designed to decrease the peak value of the dynamic response of the girder. However, it increases the cumulative displacement at the end of the girder.
引文
[1]邓扬,李爱群,丁幼亮.大跨悬索桥梁端位移与温度的相关性研究及其应用[J].公路交通科技,2009,26(5):55—58.DENG Y,LI A Q,DING Y L. Research application of correlation between beam end displacement and temperature of long-span suspension bridge[J]. Journal of Highway and Transportation Research and Development,2009,26(5):55—58.(In Chinese)
[2]刘扬,李杜宇,邓扬.大跨度悬索桥伸缩缝位移监测数据分析与评估[J].长沙理工大学学报,2015,12(2):21—28.LIU Y,LI D Y,DENG Y. Analysis and assessment of the monitoring data of expansion joints for long-span suspension bridge[J]. Journal of Changsha University of Science and Technology,2015,12(2):21—28.(In Chinese)
[3]单宏伟,韩大章,吕立人.润扬长江公路大桥悬索桥中央扣设计[J].公路,2004(8):58—61.SHAN H W,HAN D Z,L譈L R. Design of center nodes of runyang suspension bridge over yangtze river[J]. Highway,2004(8):58—61.(In Chinese)
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[5]胡腾飞,华旭刚,温青,等.中央扣对大跨悬索桥模态特性的影响[J].公路交通科技,2015,32(6):89—92.HU T F,HUA X G,WEN Q,et al. Influence of central buckles on modal characteristics of long-span suspension bridge[J]. Journal of Highway and Transportation Research and Development,2015,32(6):89—92.(In Chinese)
[6]王浩,李爱群.中央扣对大跨度悬索桥风致抖振响应的影响[J].土木工程学报,2009,42(7):78—84.WANG H,LI A Q. Influence of central buckle of wind-induced buffeting response of long-span suspension bridge[J]. China Civil Engineering Journal,2009,42(7):78—84.(In Chinese)
[7]徐勋,强士中.中央扣对大跨悬索桥动力特性和地震响应的影响研究[J].铁道学报,2010,32(4):84—91.XU X,QIANG S Z. Influence of central buckle on dynamic behavior and seismic response of long-span suspension bridge[J].Journal of China Railway Society,2010,32(4):84—91.(In Chinese)
[8]王浩,李爱群,杨玉冬,等.中央扣对大跨悬索桥动力特性的影响[J].中国公路学报,2006,19(6):49—53.WANG H,LI A Q,YANG Y D,et al. Influence of central buckle on dynamic behavior of long-span suspension bridge[J]. China Journal of Highway and Transport,2006,19(6):49—53.(In Chinese)
[9] CHATTERJEE P K,DATT T K,SURANA C S. Vibration of suspension bridge under vehicle movement[J]. Journal of Structural Engineering,1994,120(3):681—703.
[10] GUPTA R K,TRAILLNASH R W. Vehicle braking on highway bridges[J]. Journal of Engineering Mechanics,1980,106(4):641—658.
[11]朱志辉,张鹏,赵婷婷,等.考虑节点刚域影响的钢-混组合桁架梁桥行车动力响应分析[J].湖南大学学报(自然科学版),2018,45(5):19—28.ZHU Z H,ZHANG P,ZHAO T T,et al. Driving dynamic response analysis of a steel-concrete composite trussed girder bridge considering the effect of nodal rigid zone[J]. Journal of Hunan University(Natural Sciences),2018,45(5):19—28.(In Chinese)
[2]刘扬,李杜宇,邓扬.大跨度悬索桥伸缩缝位移监测数据分析与评估[J].长沙理工大学学报,2015,12(2):21—28.LIU Y,LI D Y,DENG Y. Analysis and assessment of the monitoring data of expansion joints for long-span suspension bridge[J]. Journal of Changsha University of Science and Technology,2015,12(2):21—28.(In Chinese)
[3]单宏伟,韩大章,吕立人.润扬长江公路大桥悬索桥中央扣设计[J].公路,2004(8):58—61.SHAN H W,HAN D Z,L譈L R. Design of center nodes of runyang suspension bridge over yangtze river[J]. Highway,2004(8):58—61.(In Chinese)
[4]彭旺虎,邵旭东.悬索桥纵向和竖向耦合自振研究[J].工程力学,2012,29(2):142-148.PENG W H,SHAO X D. Study on longitudinal and vertical coupling vibration of suspension bridges[J]. Engineering Mechanics,2012,29(2):142—148.(In Chinese)
[5]胡腾飞,华旭刚,温青,等.中央扣对大跨悬索桥模态特性的影响[J].公路交通科技,2015,32(6):89—92.HU T F,HUA X G,WEN Q,et al. Influence of central buckles on modal characteristics of long-span suspension bridge[J]. Journal of Highway and Transportation Research and Development,2015,32(6):89—92.(In Chinese)
[6]王浩,李爱群.中央扣对大跨度悬索桥风致抖振响应的影响[J].土木工程学报,2009,42(7):78—84.WANG H,LI A Q. Influence of central buckle of wind-induced buffeting response of long-span suspension bridge[J]. China Civil Engineering Journal,2009,42(7):78—84.(In Chinese)
[7]徐勋,强士中.中央扣对大跨悬索桥动力特性和地震响应的影响研究[J].铁道学报,2010,32(4):84—91.XU X,QIANG S Z. Influence of central buckle on dynamic behavior and seismic response of long-span suspension bridge[J].Journal of China Railway Society,2010,32(4):84—91.(In Chinese)
[8]王浩,李爱群,杨玉冬,等.中央扣对大跨悬索桥动力特性的影响[J].中国公路学报,2006,19(6):49—53.WANG H,LI A Q,YANG Y D,et al. Influence of central buckle on dynamic behavior of long-span suspension bridge[J]. China Journal of Highway and Transport,2006,19(6):49—53.(In Chinese)
[9] CHATTERJEE P K,DATT T K,SURANA C S. Vibration of suspension bridge under vehicle movement[J]. Journal of Structural Engineering,1994,120(3):681—703.
[10] GUPTA R K,TRAILLNASH R W. Vehicle braking on highway bridges[J]. Journal of Engineering Mechanics,1980,106(4):641—658.
[11]朱志辉,张鹏,赵婷婷,等.考虑节点刚域影响的钢-混组合桁架梁桥行车动力响应分析[J].湖南大学学报(自然科学版),2018,45(5):19—28.ZHU Z H,ZHANG P,ZHAO T T,et al. Driving dynamic response analysis of a steel-concrete composite trussed girder bridge considering the effect of nodal rigid zone[J]. Journal of Hunan University(Natural Sciences),2018,45(5):19—28.(In Chinese)