Numerical simulation of three-dimensional hurricane wind field around a long-span bridge

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (24) : 77-84.

HAN Wan-shui1 LIU Huan-ju1 WU Jun1 XIAO Qiang2 YAN Li3

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Abstract

Due to hurricane disasters’ frequently occurring and long-span bridges’ features of high-pylon, light weight and weak damping, performing the safety assessment of long-span bridges under the action of hurricanes is necessary. Reasonable simulation of hurricane three-dimensional wind field is the chief problem to be faced. Firstly, adopting cubic spline functions, the time-varying average wind speed of hurricane was simulated. The harmonic synthesis method was adopted to update time-varying average wind velocity and then to realize the simulation of fluctuating parts of hurricane wind speed. Considering the correlation among nodes’ wind velocities in space, the three-dimensional wind field simulation method for hurricanes was established. Secondly, based on the evolutionary spectrum theory, the non-uniformly modulated evolutionary power spectrum briefly called the evolutionary spectrum was derived, the verification method for hurricane wind field simulation was established. Through comparing the evolutionary spectrum and the simulated spectrum for hurricane, the hurricane wind field simulation results were verified. Finally, a case study of a long-span cable stayed bridge in coastal area was selected. The methods of hurricane wind field simulation and validation were used in the case study. The results showed that using the harmonic synthesis method to update the time- varying mean wind velocity and considering the correlation among nodes’ wind velocities in space, the simulation of hurricane three-dimensional wind field can be realized.

Key words

long bridge / hurricane / three-dimensional wind field / cubic spline function / harmonic synthesis method / evolutionary spectrum

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HAN Wan-shui1 LIU Huan-ju1 WU Jun1 XIAO Qiang2 YAN Li3. Numerical simulation of three-dimensional hurricane wind field around a long-span bridge[J]. Journal of Vibration and Shock, 2017, 36(24): 77-84

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