In order to study the influence of the simulated pulsating wind field with the traditional exponential decay coefficient Cy on the buffeting response of long-span suspension bridges, frequency and time domain methods were first applied for buffeting response analysis taking three long-span suspension bridges ranging from 1 000 m to 2 000 m as the background. The results indicate that the buffet response from the time domain method, considering factors like wind load nonlinearity, is safer. Based on the time domain method, reponsesat the different spanwise position of the suspension bridge under different Cy values was analyzed. The buffet response was compared with the buffet response when Cy=16 recommended by Davenport. The results show that the buffet response of the suspension bridge does not simply change linearly with the change of Cy. The buffet displacement RMS value of the three suspension bridges at the mid-span position always remains the largest under different values of Cy; When Cy is 14, the maximum values of the vertical, lateral and torsional angular displacement response RMS values of the suspension bridge are larger than those when Cy=16, which are 1.5%, 14.6% and 26.3%, respectively. The results of the buffeting response analysis of large-span suspension bridges using Davenport’s recommended values are dangerous. When performing the most unfavorable buffeting response analysis, it is recommended to select multiple groups of Cy values for calculation.
WANGJ, LIJ W, WANGF,et al .Wind speed distribution in simplified U-shaped valley and its effect on buffeting response of long-span suspension bridge[J].Journal of Jilin University (Engineering and Technology Edition),2023,53(6):1658-1668.(in Chinese)
TAOT Y, DENGP, WANGH,et al .Intelligent prediction of buffeting responses of long-span bridge under the action of thunderstorm winds[J].China Journal of Highway and Transport,2023,36(8):87-95.(in Chinese)
SUY, DIJ, LIZ G,et al .Prediction of buffeting response of long-span bridges based on sectional model vibration test[J].Engineering Mechanics,2023,40(6):182-192.(in Chinese)
[8]
BARNIN, ØISETHO A, MANNINIC.Nonlinear buffeting response of long suspension bridges considering parametric excitation due to large-scale turbulence[R]//IABSE Reports.Istanbul,Turkey:International Association for Bridge and Structural Engineering (IABSE),2023:351-358.
[9]
BARNIN, MANNINIC .Parametric effects of turbulence on the flutter stability of suspension bridges[J].Journal of Wind Engineering and Industrial Aerodynamics,2024,245:105615.
[10]
SUY, LIM S, YANGY,et al .Prediction method for bridge buffeting responses based on the integrated transfer function identified via segmental model vibration test[J].Journal of Wind Engineering and Industrial Aerodynamics,2023,242: 105578.
LUOY, REND C, HANY,et al .Study on buffeting response of bridge under non-Gaussian wind field[J].Acta Aerodynamica Sinica,2023,41(8):107-116.(in Chinese)
DAVENPORTA G .The spectrum of horizontal gustiness near the ground in high winds[J].Quarterly Journal of the Royal Meteorological Society,1961,87(372):194-211.
[16]
HUIM C H, LARSENA, XIANGH F. Wind turbulence characteristics study at the Stonecutters Bridge site: part Ⅱ: Wind power spectra, integral length scales and coherences[J]. Journal of Wind Engineering and Industrial Aerodynamics, 2009, 97(1): 48-59.
[17]
SHIOTANIM, IWATANIY. Correlations of wind velocities in relation to the gust loadings[C]//In Proceedings of the Third International Conference on Wind Effects on Buildings and Structures. Tokyo: Saikon Co., 1971: 57-67.
HUANGP, DAIY T, WANGX,et al .Field measurement on power spectra and coherence characteristics of near-ground wind in Shanghai coastal area[J].Engineering Mechanics,2014, 31(4):126-133.(in Chinese)
HUS Y, LIQ S. Field measurements of wind loads on a low-rise building:PartⅠ: Near-surface boundary layer wind characteristics of landfall typhoons[J].China Civil Engineering Journal,2012,45(2):77-84.(in Chinese)
[22]
SIMIUE, SCANLANR H .Wind effects on structures :fundamentals and applications to design[M].3rd Edition.New York: John Wiley& Sons Inc,1996: 52-53.
WANGX, HUANGP, GUM .Field measurements for the power spectral densities and spatial coherence of fluctuating wind speed near ground during typhoon‘Muifa’[J]. Acta Aerodynamica Sinica,2013,31(6):776-782.(in Chinese)
ZHANGH X, YEF, GUM. Experimental investigation on coherence characteristics of along-wind fluctuating wind velocity and wind pressure[C]//Abstracts of the Proceedings of the 8th National Academic Conference on Vibration Theory and Applications. Shanghai:Chinese Society for Vibration Engineering, etc, 2003: 11. (in Chinese)
BAIH, WANGH, JIN C,et al .Influence of length-width ratio of section model on wind tunnel test and calculation analysis[J].China Journal of Highway and Transport,2022,35(8): 202-212.(in Chinese)
[33]
丁泉顺. 大跨度桥梁耦合颤抖振响应的精细化分析[D]. 上海:同济大学, 2001.
[34]
DINGQ S. Refinement of coupled flutter and buffeting analysis for long-span bridges[D]. Shanghai: Tongji University, 2001. (in Chinese)
XIAOZ .Investigations on the aerodynamic characteristics and buffeting response of the streamlined box girders with different aspect ratios in turbulent flows[D]. Chongqing:Chongqing University,2022.(in Chinese)