It is noted that the linear hypothesis is the prerequisite of the buffeting analysis in the frequency domain. The buffeting response, which is induced by turbulent winds, can be analyzed in both time and frequency domain. As one of the wind-induced structural responses, bridge buffeting has been the concern of engineers for a long time. The obtained wind fields will provide the research basis for analyzing the non-stationary buffeting behavior of the RSB and other wind-sensitive structures in adjacent regions.įlexible long-span bridges are susceptible to extreme wind. Results show that the updated method performs well in generating the non-stationary turbulent wind field. The simulation accuracy is validated by comparing the simulated and target auto-/cross-correlation functions. The coherence function considering the phase angles is utilized to generate the turbulent wind fields for towers. Specifically, the evolutionary power spectral density (EPSD) is estimated to characterize the non-stationary feature of the field-measured wind data during Typhoon Wipha at the Runyang Suspension Bridge (RSB) site. Here, the non-negative matrix factorization-based FFT-aided SRM has been updated to generate not only the horizontal non-stationary turbulent wind field, but also the vertical one. As for non-stationary extreme wind events, some efforts have been paid to update the classic spectral representation method (SRM) and the fast Fourier transform (FFT) has been introduced to improve the computational efficiency. Numerical simulation of the turbulent wind field on long-span bridges is an important task in structural buffeting analysis when it comes to the system non-linearity.
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