Strategies for identifying the two-dimensional aerodynamic admittance functions of a bridge deck. Issue 233 (February 2023)

• Record Type: Journal Article
• Authors: Yan, Lei; Lin, Ze; He, Xuhui; Jing, Haiquan; Shi, Mingjie
• Is Part Of: Journal of wind engineering and industrial aerodynamics. Issue 233(2023)
• Publication Date: 2023-02
• Subjects: Aerodynamic admittance function -- Spanwise root-coherence function -- Two-wavenumber coherence function -- Two-wavenumber method -- Pressure coefficient -- Wind tunnel experiment; Wind-pressure -- Periodicals; Buildings -- Aerodynamics -- Periodicals; Pression du vent -- Périodiques; Constructions -- Aérodynamique -- Périodiques; Buildings -- Aerodynamics; Wind-pressure; Periodicals
• DOI: 10.1016/j.jweia.2023.105309
• Languages: English
• ISSNs: 0167-6105

Abstract

Abstract: 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. Highlights: The new strategy is proposed to reliably and repeatably identify the 2D AAFs of a bridge deck. The 2D AAFs obtained by different strategies are compared. The misunderstanding regarding the two-wavenumber coherence function model is clarified. The advantage only considering the normalized co-spectrum in the recommended strategy is explained.