Strategies for identifying the two-dimensional aerodynamic admittance functions of a bridge deck

被引:2
|
作者
Yan, Lei [1 ,2 ]
Lin, Ze
He, Xuhui [1 ,2 ]
Jing, Haiquan [1 ,2 ]
Shi, Mingjie [3 ,4 ]
机构
[1] Cent South Univ, Sch Civil Engn, Changsha 410075, Peoples R China
[2] Natl Engn Res Ctr High Speed Railway Construct, Changsha 410075, Peoples R China
[3] Hunan Prov Key Lab Disaster Prevent & Mitigat Rail, Changsha 410075, Peoples R China
[4] Shanghai Urban Construct City Operat Grp Co Ltd, Shanghai 200023, Peoples R China
基金
中国国家自然科学基金;
关键词
Aerodynamic admittance function; Spanwise root -coherence function; Two-wavenumber coherence function; Two-wavenumber method; Pressure coefficient; Wind tunnel experiment; LIFTING-SURFACE THEORY; CYLINDERS; FORCES;
D O I
10.1016/j.jweia.2023.105309
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Pressure measurement experiments were carried out on three streamlined box girders with three geometric ratios of 1:50, 1:75 and 1:100 in five turbulent flow fields generated by grids. The turbulence intensities only affected the root-mean-square (RMS) of the pressure coefficients in the flow separation zone, while the turbulence integral scales affected the RMS of the pressure coefficients over the entire cross-sections. The spanwise correlations of the fluctuating winds and buffeting forces mainly varied with the turbulence integral scales. New strategies are proposed to identify the two-dimensional aerodynamic admittance functions (2D AAFs) using the two-wavenumber approach. The two-wavenumber coherence functions of fluctuating winds or buffeting forces obtained through new strategies do not need to use the empirical spanwise root-coherence function models compared to the traditional strategy. A complete analysis of 2D AAFs based on different strategies was performed. The determined 2D AAF using spanwise root-coherence function models varied with the kinds of spanwise root-coherence function model and relied on spacings chosen to fit, which caused the 2D AAF to vary in size. Therefore, the strategy without any spanwise root-coherence function models is recommended, and it is confirmed to give reliable and repeatable bridge deck 2D AAFs.
引用
收藏
页数:16
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