Abstract:
Characteristics of typhoon wind fields have a predominant influence on the wind-induced response of large-span bridges. Based on the time-history records of the strong typhoon Hagupit (0814) which passed through the territory of China, statistical analysis and comparative study were conducted on the measured data including the mean wind speed, wind direction, angle of attack, and pulsating wind power spectrum during the landing. Subsequently, in order to explore the buffeting response of bridge structures induced by strong typhoons, the specification spectrum and the measured typhoon spectrum were applied to study the three-dimensional wind-induced buffeting response of a long-span cable-stayed bridge with a main span 448 m in the typhoon-prone area. The results of buffeting response calculated by the measured typhoon spectrum and the specification spectrum show considerable differences. Furtherly, considering the impact of large angle-of-attack wind fields on the bridge buffeting response, the vertical and torsional displacements were 204.12% and 264.87% of the results of bridge buffeting responses by only considering the specification spectrum. The results show that the buffeting responses, even for medium-span bridges, would be significantly affected by large angle of attack and pulsating wind power with large high-frequency turbulence energy under typhoon environments.