Analysis of Windinduced Response and Dynamic Properties of Cablestayed Bridge Under Typhoon

Abstract:

Based on structural health monitoring system of Donghai Bridge,the cablestayed bridge response and environmental factors were measured during the typhoon Krosa.The characteristics of typhoon,windinduced response and structural modal parameters variation were analyzed.The results demonstrate that the turbulence intensity is increasing with the wind speed. The wind induced response also increases when the wind speed increases.The structural modal parameters during typhoon were identified by the method of wavelet transform and singular value decomposition,and the modal parameters during the typhoon also were compared with that under the condition of low wind speed.Influenced by typhoon,structural modal frequencies were decreased and the modal damping ratios were not changed significantly when the wind speed increased.