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| Tests for effects of torsional center offset on flutter critical wind velocity of a truss bridge |
| LI Yongle1， WU Bing1,2, WANG Bin1， TANG Ping1 |
1. Department of Bridge Engineering, Southwest Jiaotong University, Chengdu 610031, China;
2. China Railway Siyuan Survey and Design Group Co.Ltd., Wuhan 430063, China. |
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Abstract A great number of long-span truss bridges are built in mountainous areas nowadays.Their flutter performance is usually determined through their elastic sectional model wind tunnel tests.In tests, their main girder torsional centers are set at centroids of the models in general.However, influenced by several factors, the main girder torsional center of long-span cable bridges may offset from its centroids to result in the deviation between the wind tunnel test results and the actual situation.Here, the vertical offset of the torsional center of a truss bridge was simulated through its sectional model wind tunnel tests.Flutter critical wind velocities of a long-span cable-stayed bridge and a long-span suspension one with different torsional center offsets were measured.The effects of elastic rotating center formed due to torsional center offset, moment of inertia, and torsional frequency on these bridges’ flutter critical wind velocities were contrastively studied.The results showed that as a whole, the torsional center offset from centroid causes increase in a truss bridge’s flutter critical wind velocity.
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Received: 02 May 2017
Published: 28 October 2018
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[1] 项海帆, 葛耀君. 大跨度桥梁抗风技术挑战与基础研究[J]. 中国工程科学, 2011(09): 8-21.
Xiang Haifan, Ge Yaojun. Wind resistance challenges and fundamental research on long span bridges [J]. Engineering Sciences, 2011(09): 8-21. (in Chinese)
[2] 陈政清. 桥梁风工程[M]. 北京: 人民交通出版社, 2005.
Chen Zhengqing. Bridge wind engineering [M]. Beijing: China Communications Press, 2005. (in Chinese)
[3] 葛耀君. 大跨度桥梁抗风的技术挑战与精细化研究[J]. 工程力学, 2011, 28 (Sup.II): 11-23.
Ge Yaojun. Technical challenges and refinement research on wind resistance of long-span bridges [J]. Engineering Mechanics, 2011, 28 (Sup.II): 11-23. (in Chinese)
[4] Zhang W M, Ge Y J, Levitan M L. Aerodynamic flutter analysis of a new suspension bridge with double main spans [J]. Wind and Structures, 2011, 14(3): 187-208.
[5] 张文明, 葛耀君, 周志勇, 等. 双主跨悬索桥颤振稳定性试验[J]. 中国公路学报, 2010(04): 58-62.
Zhang wenming, Ge Yaojun, Zhou Zhiyong, et al. Experiment on flutter stability of suspension bridge with double main span [J]. China Journal of Highway and Transport. 2010(04): 58-62. (in Chinese)
[6] 胡峰强, 陈艾荣, 林铁良. 杭州湾南航道独塔斜拉桥抗风性能试验研究[J]. 工程力学, 2006, 23(8): 132-137.
Hu Fengqiang, Chen Airong, Lin Tieliang. Experimental investigation on wind-resistant behavior of the single-tower cable-stayed bridge over south channel of Hangzhou gulf [J]. Engineering Mechanics, 2006, 23(8): 132-137. (in Chinese)
[7] 王凯, 廖海黎, 刘君. 山区峡谷大跨钢桁梁桥抗风特性试验研究[J]. 振动与冲击, 2014, 33(19): 169-174.
Wang Kai, Liao Haili, Liu Jun. Wind resistance tests for long-span steel truss bridges across gorges of mountainous area [J]. Journal of Vibration and Shock, 2014, 33(19): 169-174. (in Chinese)
[8] 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 Chunguang, Zhang Zhitian, Chen Zhengqing, et al. 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. (in Chinese)
[9] 李加武, 车鑫, 高裴, 等. 窄悬索桥颤振失稳控制措施效果研究[J]. 振动与冲击, 2012, 31(23): 77-81.
Li Jiawu, Chen Xin, Gao Fei, et al. Effects of wind-resistant control measures against flutter instability of a narrow suspension bridge [J]. Journal of Vibration and Shock, 2012, 31(23): 77-81. (in Chinese)
[10] 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 Zhengqing, Ouyang Kejian, Niu Huawei, et al. 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. (in Chinese)
[11] 徐爱军, 王凯, 李明水等. 板-桁组合式钢桁梁悬索桥颤振稳定性选型研究[J]. 实验流体力学, 2015, 29(4): 52-57.
Xu Aijun, Wang Kai, Li Mingshui, et al. Flutter stability selection study of a long-span steel truss suspension bridge with a combined deck plate [J]. Journal of Experiments in Fluid Mechanics, 2015, 29(4): 52-57. (in Chinese)
[12] JTG/T D60-01-2004公路桥梁抗风设计规范[S]. 北京: 人民交通出版社, 2004.
JTG/T D60-01-2004 Wind-resistantdesign specification for highway bridges[S]. Beijing: China Communications Press, 2004. (In Chinese)
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