Identification of aeroelastic parameters of flexible bridges
Identification of aeroelastic parameters of flexible bridges
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DOI：
10.1061/(asce)0733-9399(1994)120:8(1718
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发表时间：
1994-08
期刊：
影响因子：
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通讯作者：
P. Sarkar;N. P. Jones;R. Scanlan
中科院分区：
文献类型：
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作者：
P. Sarkar;N. P. Jones;R. Scanlan
从一次节段模型试验中同时提取柔性桥面的所有气动弹性参数是一个过去没有完全实现的理想目标。在本文的工作中，设计了一种用于执行截面模型的竖直-扭转耦合运动的实验装置。在本实例中，截面模型位于表示双甲板结构的相邻甲板的截面的固定模型附近。提出了一种稳健的系统辨识方法，并将其应用于断面模型受噪声污染的位移时程。文中给出了实验装置、气动弹性参数的提取方法以及所得结果的意义。试验是在光滑和湍动两种情况下进行的，并在有无第二层甲板的情况下进行。这项技术被证明提供了良好的性能，这从获得的一致的气动弹性参数中可见一斑。
Simultaneous extraction of all the aeroelastic parameters of a flexible bridge deck from a single section‐model test has been a desirable goal not fully attained in the past. In the work reported herein, an experimental setup was designed for executing coupled vertical‐torsional motion of a section model. In the present instance, the section model was located in proximity to a fixed model representing a section of the adjacent deck of a twin‐deck configuration. A robust system‐identification method was developed and applied to the noise‐corrupted displacement time histories of the section model. The experimental setup, the method of extracting the aeroelastic parameters, and the implications of the results obtained are presented in this paper. The tests were performed under both smooth and turbulent flow conditions, and in both the presence and absence of the second deck. This technique proved to offer good performance, which is evident from the consistent aeroelastic parameters obtained.