Evaluation and Early Warning of Vortex-Induced Vibration of Existed Long-Span Suspension Bridge Using Multisource Monitoring Data

Abstract

Due to the designing characteristics of long span and low stiffness, the high-order vortex-induced vibration (VIV) of suspension bridges may occur under a special wind environment. The prototype monitoring data make it feasible to rapidly capture and evaluate the VIV behavior during bridge operation. Based on the multisource load-response data of a long-span suspension bridge in a rare VIV phenomenon, this paper comprehensively evaluated the entire process of the input–output behavior of bridge VIV. The cause of this bridge VIV phenomenon is discussed, and the VIV parameter is estimated. The human comfort of vehicle riding in the VIV phenomenon is evaluated. A fast early-warning method of bridge VIV driven by multisource monitoring data is proposed according to the analysis and evaluation results of the bridge VIV phenomenon. The main results demonstrated that continuous excitation of wind whose direction is almost perpendicular to the longitudinal direction of the bridge are more likely to cause VIV; the Strouhal number of the three-meter-high stiffening box-shape opening-below steel girder is approximately 0.101694 according to the k-means clustering of inversely-calculated results of the monitoring data. The evaluation results and proposed early-warning method support the wind-resistant design, health monitoring, and intelligent maintenance of long-span suspension bridges.