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Two-Dimensional Aerodynamic Admittance of a Flat Closed-Box Bridge
| 题名： | Two-Dimensional Aerodynamic Admittance of a Flat Closed-Box Bridge |
| 正文语种： | eng |
| 作者： | Wang, Junxin;Ma, Cunming;Dragomirescu, Elena;Chen, Xin;Yang, Yang |
| 作者单位： | Southwest Jiaotong Univ Sch Civil Engn Chengdu 610031 Peoples R China;Southwest Jiaotong Univ Sch Civil Engn Chengdu 610031 Peoples R China|Key Lab Wind Engn Sichuan Prov Chengdu 610031 Peoples R China;Univ Ottawa Dept Civil Engn Ottawa ON K1N 6N5 Canada;Southwest Jiaotong Univ Sch Civil Engn Chengdu 610031 Peoples R China;Southwest Jiaotong Univ Sch Civil Engn Chengdu 610031 Peoples R China |
| 关键词： | Aerodynamic admittance;Closed-box bridge girder;Wind tunnel test;Free-stream turbulence;Harmonic vertical gust |
| 摘要： | Wind tunnel tests were carried employing two different free-stream turbulent flow fields and one harmonic vertical gust profile conditions, and pressure measurements of the buffeting force on six separated strips of a flat closed-box bridge-deck section model were recorded. Two-dimensional aerodynamic admittance functions (2D-AAF) were obtained using one- and two-wavenumber computational theory, respectively. An empirical expression for determining the 2D-AAF for flat closed-box bridge decks in free-stream turbulence was proposed based on the extensive results of the experimental data. This study indicates that the 2D-AAF of the flat closed-box bridge deck is higher than the Sears function in the low-frequency range, and the aerodynamic admittance remains almost constant for reduced frequencies in the range of 0-0.145. For a given bridge section, its 2D-AAF is unique and related only to the geometry of the deck cross section, regardless of whether or not the strip assumption is valid. The fluctuating pressure near the leading edge of the bridge deck in the harmonic vertical gust was obviously much larger than that obtained in free-stream turbulent wind fields, which significantly affects the magnitude of the lift force. (C) 2020 American Society of Civil Engineers. |
| 出版年： | 2021 |
| 期刊名称： | Journal of Structural Engineering |
| 卷： | 147 |
| 期： | 3 |
| 页码： | 04020359.1-04020359.13 |
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