| 引用本文: | 董锐,葛耀君,杨詠昕,韦建刚.斜拉桥П型开口主梁断面抖振性能比选[J].哈尔滨工业大学学报,2017,49(3):168.DOI:10.11918/j.issn.0367-6234.2017.03.027 |
| DONG Rui,GE Yaojun,YANG Yongxin,WEI Jiangang.Buffeting performances comparison of cable-stayed bridge with shaped deck[J].Journal of Harbin Institute of Technology,2017,49(3):168.DOI:10.11918/j.issn.0367-6234.2017.03.027 |
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| 摘要: |
| 为获得斜拉桥П型开口主梁断面在脉动风作用下的合理气动外形，在风洞试验的基础上进行了抖振性能比选.首先，以一主跨300 m的斜拉桥为原型，设计了3组不同的П型主梁断面；其次，进行了节段模型测力、测振风洞试验，获得П型主梁断面在不同风攻角下的静风三分力系数和颤振导数等气动力参数；最后，以上述气动力参数为基础，采用同时考虑自激力和抖振力的计算模型对不同П型主梁断面的抖振性能进行比选分析.结果表明：不同外形主梁的抖振响应不同，通过改变外形可以改变П型主梁在任一自由度上的抖振性能，但对竖向、侧向和扭转自由度的影响往往很难同时达到最优. П型主梁断面合理气动外形的选择，应根据斜拉桥受力特性，综合考虑颤振、涡振和抖振性能后确定.
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| 关键词: 斜拉桥 П型主梁断面 抖振 风洞试验 自激力 抖振力 |
| DOI：10.11918/j.issn.0367-6234.2017.03.027 |
| 分类号:U441+.3 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(7,7)； 中国博士后科学基金(2016M590592) |
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| Buffeting performances comparison of cable-stayed bridge with shaped deck |
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DONG Rui1,2,GE Yaojun2,YANG Yongxin2,WEI Jiangang1
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(1. College of Civil Engineering, Fuzhou University,Fuzhou 350108, China; 2. State Key Laboratory of Disaster Reduction in Civil Engineering (Tongji University), Shanghai 200092, China)
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| Abstract: |
| In order to obtain reasonable aerodynamic shape of П shaped bridge decks, the buffeting performances comparison of a cable-stayed bridge was conducted based on wind tunnel tests. Firstly, three different types of П shaped bridge decks were designed based on one real cable-stayed bridge with a main span of 300 m. Secondly, force balance and vibration sectional model wind tunnel tests were carried out to obtain aerodynamic parameters under different wind attack angles. The aerodynamic parameters include three-component static wind loading coefficients, flutter derivatives, etc. Finally, three types of П shaped bridge decks' buffeting performances were compared and analyzed by considering the aeroelastic and buffeting forces. The results show that buffeting responses of the bridge with different П shaped decks are different from each other. Buffeting responses in any one freedom could be changed when changing bridge deck shape. However, the optimal influences in vertical, lateral and torsional directions could not be achieved at the same condition. Reasonable aerodynamic shape selection of П shaped bridge decks should consider the mechanical characteristics and the performances of flutter, vortex and buffeting.
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| Key words: cable-stayed bridge П shaped bridge deck buffeting wind tunnel test aeroelastic forces buffeting forces |
