芜湖长江公铁大桥主桥抗风性能试验研究
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摘要
商合杭铁路芜湖长江公铁大桥主桥为主跨588m的钢箱桁组合梁斜拉桥。为确定该桥在施工期和运营期的抗风安全性,对其开展抗风性能研究。分别进行主梁节段模型、桥塔气弹模型、全桥气弹模型及并列拉索风洞试验,研究该桥在成桥状态及最不利施工状态的风致响应。结果表明:施工和成桥状态下,该桥主梁的颤振临界风速均远大于颤振检验风速,颤振稳定性较好;不同风速下均未观测到明显涡振,涡振性能满足规范要求;设计风速内,不同来流偏角下桥塔均未发生驰振及影响施工的大幅涡振,动力稳定性良好;实桥风速达到84.0m/s时主梁仍未发生颤振、横向屈曲、扭转发散等静力失稳现象,也未发现影响施工的涡振和大幅抖振;最不利工况下,下游拉索在风速37.4m/s时即出现一阶大幅尾流驰振,设置刚性连接杆可以有效抑制尾流驰振现象。
The main bridge of Wuhu Changjiang River Rail-cum-Road Bridge on ShangqiuHefei-Hangzhou Railway in China is a steel box-truss composite girder cable-stayed bridge,with a main span of 588 m.To ensure the wind-resistant safety of the bridge during construction and operation stages,we performed the wind tunnel experiments,including the sectional model test of main girder,the aeroelastic model test of bridge pylon,the aeroelastic model test of full bridge,and the wake galloping test of parallel cables,to investigate the wind-induced responses of the bridge at the service stage and the most unfavorable construction stage.The results show that the critical flutter wind speed is far more than the inspection speed both in the construction and service stages,which indicates that the safety reserve of flutter stability is enough;the vortex-induced vibration is inconspicuous at difference wind speeds,which indicates that the vortex-induced vibration performance meets the requirements of the code;the galloping phenomenon does not happen in the condition of designed wind speed and the dramatic vortex-induced vibration is not observed during bridge construction,which demonstrates the good dynamic stability of the pylon;the static instability phenomena such as flutter,transverse buckling and torsional divergence do not occur at a real wind speed 84.0 m/s,and the vortex-induced vibration and the sharp wind-induced buffeting which impair the construction are not observed;in the most unfavorable condition of the experimental tests,the obvious wake galloping phenomenon of the downstream parallel cable will occur at a the wind speed of 37.4 m/s,however,setting rigid connecting rods can restrain the galloping of the parallel cables effectively.
The main bridge of Wuhu Changjiang River Rail-cum-Road Bridge on ShangqiuHefei-Hangzhou Railway in China is a steel box-truss composite girder cable-stayed bridge,with a main span of 588 m.To ensure the wind-resistant safety of the bridge during construction and operation stages,we performed the wind tunnel experiments,including the sectional model test of main girder,the aeroelastic model test of bridge pylon,the aeroelastic model test of full bridge,and the wake galloping test of parallel cables,to investigate the wind-induced responses of the bridge at the service stage and the most unfavorable construction stage.The results show that the critical flutter wind speed is far more than the inspection speed both in the construction and service stages,which indicates that the safety reserve of flutter stability is enough;the vortex-induced vibration is inconspicuous at difference wind speeds,which indicates that the vortex-induced vibration performance meets the requirements of the code;the galloping phenomenon does not happen in the condition of designed wind speed and the dramatic vortex-induced vibration is not observed during bridge construction,which demonstrates the good dynamic stability of the pylon;the static instability phenomena such as flutter,transverse buckling and torsional divergence do not occur at a real wind speed 84.0 m/s,and the vortex-induced vibration and the sharp wind-induced buffeting which impair the construction are not observed;in the most unfavorable condition of the experimental tests,the obvious wake galloping phenomenon of the downstream parallel cable will occur at a the wind speed of 37.4 m/s,however,setting rigid connecting rods can restrain the galloping of the parallel cables effectively.
引文
[1]HE Xu-hui,WU Teng,ZOU Yun-feng,et al.Recent Developments of High-Speed Railway Bridges in China[J].Structure and Infrastructure Engineering,2017,22:1 584-1 595.
[2]李永乐,徐昕宇,郭建明,等.六线双层铁路钢桁桥车桥系统气动特性风洞试验研究[J].工程力学,2016,33(4):130-135.(LI Yong-le,XU Xin-yu,GUO Jian-ming,et al.Wind Tunnel Tests on Aerodynamic Characteristics of Vehicle-Bridge System for Six-Track Double-Deck Steel-Truss Railway Bridge[J].Engineering Mechanics,2016,33(4):130-135.in Chinese)
[3]HE Xu-hui,QIN Hong-xi,LIU Wen-shuo,et al.Design,Analysis and Construction of a Steel Truss Cable-Stayed Bridge for High-Speed Railway in China[J].Structural Engineering International,2016,26(4):381-388.
[4]曾勇,郑慧君,刘岩,等.单索面钢桁梁独塔斜拉桥施工阶段动力参数分析[J].桥梁建设,2016,46(4):35-39.(ZENG Yong,ZHENG Hui-jun,LIU Yan,et al.A-nalysis of Dynamic Parameters of Steel Truss Girder Cable-Stayed Bridge with Single Pylon and Single Cable Plane at Construction Stage[J].Bridge Construction,2016,46(4):35-39.in Chinese)
[5]严国敏.现代斜拉桥[M].成都:西南交通大学出版社,2000.(YAN Guo-min.Modern Cable-stayed Bridges[M].Chengdu:Southwest Jiaotong University Press,2000.in Chinese)
[6]杨平,许志艳,余浪.南广线桂平郁江特大桥主桥抗风性能试验研究[J].铁道工程学报,2015,32(2):76-81.(YANG Ping,XU Zhi-yan,YU Lang.The Experimental Study of Wind-Resistant Performance of Main Bridge of the Guiping Yu River Grand Bridge on Nanning-Guangzhou Railway[J].Journal of Railway Engineering Society,2015,32(2):76-81.in Chinese)
[7]JTG/T D60-01-2004,公路桥梁抗风设计规范[S].(JTG/T D60-01-2004,Wind-Resistent Design Specification for Highway Bridges[S].)
[8]何玮,郭向荣,邹云峰,等.风屏障透风率对车-桥系统气动特性影响的风洞试验研究[J].振动与冲击,2015,34(24):93-97,110.(HE Wei,GUO Xiang-rong,ZOU Yun-feng,et al.Wind Tunnel Test on the Effect of Wind Barrier Porosity on Train-Bridge System[J].Journal of Vibration and Shock,2015,34(24):93-97,110.in Chinese)
[9]李永乐,王涛,廖海黎.斜拉桥并列拉索尾流驰振风洞试验研究[J].工程力学,2010,27(S1):216-221,227.(LI Yong-le,WANG Tao,LIAO Hai-li.Investigation on Wake Galloping of Parallel Cables in Cable-Stayed Bridge by Wind Tunnel Test[J].Engineering Mechanics,2010,27(S1):216-221,227.in Chinese)
[10]JING Hai-quan,XIA Yong,LI Hui,et al.Excitation Mechanism of Rain-Wind Induced Cable Vibration in a Wind Tunnel[J].Journal of Fluids and Structures,2017,68:32-47.
[2]李永乐,徐昕宇,郭建明,等.六线双层铁路钢桁桥车桥系统气动特性风洞试验研究[J].工程力学,2016,33(4):130-135.(LI Yong-le,XU Xin-yu,GUO Jian-ming,et al.Wind Tunnel Tests on Aerodynamic Characteristics of Vehicle-Bridge System for Six-Track Double-Deck Steel-Truss Railway Bridge[J].Engineering Mechanics,2016,33(4):130-135.in Chinese)
[3]HE Xu-hui,QIN Hong-xi,LIU Wen-shuo,et al.Design,Analysis and Construction of a Steel Truss Cable-Stayed Bridge for High-Speed Railway in China[J].Structural Engineering International,2016,26(4):381-388.
[4]曾勇,郑慧君,刘岩,等.单索面钢桁梁独塔斜拉桥施工阶段动力参数分析[J].桥梁建设,2016,46(4):35-39.(ZENG Yong,ZHENG Hui-jun,LIU Yan,et al.A-nalysis of Dynamic Parameters of Steel Truss Girder Cable-Stayed Bridge with Single Pylon and Single Cable Plane at Construction Stage[J].Bridge Construction,2016,46(4):35-39.in Chinese)
[5]严国敏.现代斜拉桥[M].成都:西南交通大学出版社,2000.(YAN Guo-min.Modern Cable-stayed Bridges[M].Chengdu:Southwest Jiaotong University Press,2000.in Chinese)
[6]杨平,许志艳,余浪.南广线桂平郁江特大桥主桥抗风性能试验研究[J].铁道工程学报,2015,32(2):76-81.(YANG Ping,XU Zhi-yan,YU Lang.The Experimental Study of Wind-Resistant Performance of Main Bridge of the Guiping Yu River Grand Bridge on Nanning-Guangzhou Railway[J].Journal of Railway Engineering Society,2015,32(2):76-81.in Chinese)
[7]JTG/T D60-01-2004,公路桥梁抗风设计规范[S].(JTG/T D60-01-2004,Wind-Resistent Design Specification for Highway Bridges[S].)
[8]何玮,郭向荣,邹云峰,等.风屏障透风率对车-桥系统气动特性影响的风洞试验研究[J].振动与冲击,2015,34(24):93-97,110.(HE Wei,GUO Xiang-rong,ZOU Yun-feng,et al.Wind Tunnel Test on the Effect of Wind Barrier Porosity on Train-Bridge System[J].Journal of Vibration and Shock,2015,34(24):93-97,110.in Chinese)
[9]李永乐,王涛,廖海黎.斜拉桥并列拉索尾流驰振风洞试验研究[J].工程力学,2010,27(S1):216-221,227.(LI Yong-le,WANG Tao,LIAO Hai-li.Investigation on Wake Galloping of Parallel Cables in Cable-Stayed Bridge by Wind Tunnel Test[J].Engineering Mechanics,2010,27(S1):216-221,227.in Chinese)
[10]JING Hai-quan,XIA Yong,LI Hui,et al.Excitation Mechanism of Rain-Wind Induced Cable Vibration in a Wind Tunnel[J].Journal of Fluids and Structures,2017,68:32-47.