| 桥梁断面气动导纳互谱识别方法注记 |
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| 引用本文： | 赵林,葛耀君,李鹏飞.桥梁断面气动导纳互谱识别方法注记[J].振动与冲击,2010,29(1):81-87. |
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| 作者姓名： | 赵林 葛耀君 李鹏飞 |
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| 作者单位： | 同济大学土木工程防灾国家重点实验室，上海200092 |
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| 基金项目： | 科技部国家重点实验室基础研究项目，国家自然科学基金委重大研究计划重点研究项目 |
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| 摘 要： | 现存的各种气动导纳函数识别方法,为了便于求解忽略了脉动风速互谱的作用,且假定脉动风水平和竖向分量对抖振力导纳函数分量作用等效,识别过程缺少对算法系统和试验采样误差影响的标定,导纳函数识别结果缺少验证等诸多不足。针对上述问题,采用改进的互谱导纳识别方法,考虑了多种影响因素的共同作用,详细标定了算法系统和试验测量误差的影响,基于测量稳定性和精度较高的节段模型高频天平测力方法识别了流线型箱梁桥梁节段Scanlan抖振气动力全部六个导纳函数分量。
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| 关 键 词： | 气动导纳函数 流线型箱梁 互谱识别方法 高频测力天平 |
| 收稿时间： | 2008-11-24 |
| 修稿时间： | 2009-2-10 |
Footnote about correlation spectrum identification method for aerodynamic admittance of a bridge girder cross-section |
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| ZHAO Lin,GE Yao-jun,LI Peng-fei.Footnote about correlation spectrum identification method for aerodynamic admittance of a bridge girder cross-section[J].Journal of Vibration and Shock,2010,29(1):81-87. |
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| Authors: | ZHAO Lin GE Yao-jun LI Peng-fei |
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| Affiliation: | State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China |
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| Abstract: | In order to simplify identification algorithm about aerodynamic admittance function of a typical bridge section, some assumptions were usually adopted, such as, ignoring correlation spectrum component about stochastic wind wave, assuming equivalence about vertical- and horizontal- spectrum components between stochastic wind wave and buffeting force history, and neglecting precision evaluation about identification algorithm system and testing sampling process.For the above shortcomings, the so-called "modified correlation spectrum identification method" was proposed, it could synchronously consider multi-component effects between stochastic wind components and buffeting forces, and its precision and effectiveness were also validated with the help of numerical simulation.Finally, using the high-frequency force-measured balance in wind tunnel tests, multi-component admittance functions of a streamline box-girder cross-section bridge model were identified. |
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| Keywords: | aerodynamic admittance function streamline box girder correlation spectrum identification method high-frequency force-measured balance |
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