|
|
|
| Flutter Stability Study of A Long-span Suspension Bridge with Steel Truss based on wind tunnel testing |
| WANG Kai, LIAO Hai-li, Li Ming -shui |
| Research Center for Wind Engineering, Southwest Jiaotong University, Chengdu 610031 |
|
|
|
|
Abstract Section model wind tunnel test is currently the main technique to investigate the flutter performance of long-span bridges. But further study about applying the results to the aerodynamic optimization of the bridge main beam is still needed. Methods and results of selecting design wind parameters of the bridges in the mountainous valley are determined by using the example of one long-span steel truss girder suspension bridge. The flutter critical winds at different attack angles are obtained through the 1:48 proportion section model flutter test. Under the most unfavorable working condition, tests to investigate the effects that upper central stabilized plate, lower central stabilized plate and horizontal stabilized plate have on the flutter performance of the main beam were conducted. According to the test results, the optimal aerodynamic measure was chosen to have met the requirements of the bridge wind resistance in consideration of safety, economy and aesthetics. At last, the credibility of the results is confirmed by the 1:100 proportion full bridge aerodynamic elastic model test. That the flutter reduced wind speed of long-span steel truss suspension bridges stays approximately at 4 is concluded as a reference for the investigation of the flutter performance of similar steel truss girder suspension bridges.
|
|
Received: 22 October 2014
Published: 15 August 2015
|
|
|
|
[1] Scanlan R H. Problematic in formulation of wind．force model for bridge decks[J]. J Struct. Engrg. ASCE, 1993, 119(7):1433—1446.
[2] Ito M, Fujino Y. A probabilistic study of torsion flutter of suspension bridge under fluctuating wind[C]. Proceedings of the 4th International Conference on Structural Safety and Reliability. New York: ASCE, 1985:145—160.
[3] 杨泳昕, 葛耀君, 曹丰产. 大跨度悬索桥中央开槽箱梁断面的颤振性能[J]. 中国公路学报, 2007, 20(3):35-40.
YANG Yong-xin, GE Yao-jun, CAO Feng-chan. Flutter performance of central-slotted box girder section for long-span suspension bridges[J]. China Journal of Highway and Transport, 2007,20(3):35—40.
[4] 陈政清, 欧阳克俭, 牛华伟, 等. 中央稳定板提高桁架梁悬索桥颤振稳定性的气动机理[J]. 中国公路学报, 2009, 22(6):53-59.
Chen Zheng-qing, Ouyang Ke-jian, Niu Hua-wei, et a1. Aerodynamic mechanism of improvement of flutter stability of truss-girder suspension bridge using central stabilizer[J]. China Journal of Highway and Transport, 2009, 22(6):53-59.
[5] 中华人民共和国交通部. JTG/T D60—01—2004 公路桥梁抗风设计规范[S].北京:中国交通出版社,2004.
[6] 王凯, 廖海黎, 李明水. 山区峡谷桥梁设计基准风速的确定方法[J]. 西南交通大学学报,2013,48(1): 29-36.
Wang Kai, Liao Haili, Li Mingshui. Determination method for basic design wind speed of mountainous valley bridge[J]. Journal of Southwest Jiaotong University, 2013, 48(1): 29-36.
[7] 徐洪涛.山区峡谷风特性参数及大跨度桁梁桥风致振动研究[D]. 西南交通大学土木工程学院,2009.
[8] 徐洪涛, 廖海黎, 李明水. 坝陵河大桥节段模型风洞试验研究[J]. 世界桥梁, 2009(4): 83―89.
Xu Hongtao, Liao Haili, Li Mingshui. Wind tunnel test study of sectional model of baling river bridge[J]. World Bridges, 2009(4): 83-89.
[9] 许福友, 陈艾荣, 张哲. 确定桥梁模型颤振临界风速的实用方法[J]. 振动与冲击, 2008, 27(12) : 97-102.
Xu Fuyou, Chen Airong, Zhang Zhe. Practical technique for determining critical flutter wind speed of bridge model[J]. Journal of Vibration and Shock, 2008, 27(12): 97―102.
[10] 胡峰强. 山区风特性参数及钢桁架悬索桥颤振稳定性研究[D]. 同济大学桥梁与隧道工程, 2006.
[11] 刘慕广, 陈政清. 典型钝体断面大攻角下的颤振自激力特性[J]. 振动与冲击, 2013,32(10):22-25.
LIU Mu-guang, CHEN Zheng-qing. Characteristcs of self-excited forces in flutter of typical blunt body under large attack angles[J]. Journal of Vibration and Shcok, 2013,32(10):22-25.
[12] 李春光, 张志田, 陈政清, 等. 桁架加劲梁悬索桥气动稳定措施试验研究[J]. 振动与冲击, 2008,27(9):40-43.
Li Chun-guang, Zhang Zhi-tian, Chen Zheng-qing, et a1. Experimental study on the aerodynamic stability measure of a suspension bridge with truss stiffening girder[J]. Journal of Vibration and Shock, 2008,27(9):40-43.
[13] Zhu L D, Wang M, Wang D L. Flutter and buffeting performances of third Nanjing bridge over Yangtze river under yaw wind via aeroelastic model test [J]. Journal of Wind Engineering and Industrial Aerodynamics, 2007,95(9-11): 1579―1606.
|
|
|
|
