| 桥梁断面18个颤振导数自由振动识别 |
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| 引用本文： | 陈艾荣,项海帆,何宪飞,丁泉顺. 桥梁断面18个颤振导数自由振动识别[J]. 同济大学学报(自然科学版), 2002, 30(5): 544-550 |
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| 作者姓名： | 陈艾荣 项海帆 何宪飞 丁泉顺 |
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| 作者单位： | 同济大学土木防灾国家重点实验室,上海,200092 |
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| 基金项目： | 国家自然科学基金重大基金资助项目 (5 9895 410 )，教育部优秀青年教师资助项目 |
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| 摘 要： | 桥梁断面的自激振动力可以用18个颤振导数来表述。在现有的两自由度体系总体最小二乘法基础上，发展了用于识别桥梁断面三自由度体系18个 颤振导数的方法和试验装置。利用该方法对箱梁断面进行节段模型试验，得到了全部18个颤振导数。将三自由度试验结果与CFD（computatonal fluid dynamics)方法得到的颤振导数进行了分析比较，同时对准定常理论的估算公式进行了考证。
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| 关 键 词： | 桥梁断面 颤振导数 自由振动识别 节段模型 颤振自激力 |
| 文章编号： | 0253-374X(2002)05-0544-07 |
| 修稿时间： | 2001-10-29 |
ldentification of 18 Flutter Derivatives of Bridge Decks |
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| CHEN Ai-rong,XIANG Hai-fan,HE Xian-fei,DING Quan-shun. ldentification of 18 Flutter Derivatives of Bridge Decks[J]. Journal of Tongji University(Natural Science), 2002, 30(5): 544-550 |
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| Authors: | CHEN Ai-rong XIANG Hai-fan HE Xian-fei DING Quan-shun |
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| Abstract: | The aerodynamic self-excited forces can be described in 18 flutter derivatives.Based on the existing identification theory and experimental system of 2-DOF sectional models,the General Least-Square Theory and the experimental system of bridge deck sections for identifying 18 flutter derivatives are developed in this paper.All 18 flutter derivatives of a streamlined box girder section are obtained from the free vibration time histories of motions with the General Least-Square Theory.The derivatives from 3-DOF experiment are compared with the results from CFD method.Furthermore,the estimated values based on the pseudo-steady formulation are verified with the experimental results.Experimental determination and study of all 18 derivatives will significantly advance the understanding of the physical mechanism of bridges to wind loading. |
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| Keywords: | sectional model aerodynamic self-excited forces flutter derivatives parameter identification |
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