Aerodynamic Admittance Research on Wide-body Flat Steel Box Girder
Lian Jie Liu*, 1, 2, 3, Liang Liang Zhang1, 2, Bo Wu1, 2, Yang Yang1, 2
1 Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Chongqing 400040, China
2 School of Civil Engineering, Chongqing University, Chongqing 400040, China
3 Department of Highway Engineering, Chongqing Construction Science Research Institute, Chongqing 400017, China
Aerodynamic admittance is a key parameter affecting the analysis accuracy of the bridge buffeting response. However, few articles have covered the issue of the wide-body flat box girder with much smaller depth-width ratio (such as 1/12 studied in this paper). Therefore, to explore the real buffeting force of the wide-body flat box girder, experiments of the static force coefficients and aerodynamic admittance are carried out in wind tunnel. Wooden segmental model has a scale ratio of 1/60 to an actual 42 m wide suspension bridge girder. Using the high-frequency-force-balance (HFFB) equipment fixed with the segmental model under the conditions of different wind speeds and different wind attack angles, wind power spectrums of the buffeting force are measured and the variation of aerodynamic admittance parameters is analyzed. The results show that the aerodynamic admittance of the box girder measured in the experiment with this so much smaller depth-width ratio differs from the corresponding classical Sears expression. Some inspiration can be presented for the future study of the buffeting response for this kind of much wider bridge with the similar ratio in this paper.
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* Address correspondence to this author at the School of Civil Engineering, Chongqing University, Chongqing, China; Tel: + 86 15826145461; E-mail: firstname.lastname@example.org