Analysis of Wind-Induced Effects and Vibration Control of a Cable-Supported Bridges with a Steel Truss Girder in Strong Marine Wind Environments

This paper examines the effects of strong marine wind on a newly constructed ca-ble-stayed railway bridge with a steel truss girder and a main span of 364 meters over the sea in the maximum single cantilever state. It compares the effectiveness of different wind-resistant measures in mitigating wind-induced vibrations. The results indicate that using the turbulent field parameters and unit aerodynamic admittance function recom-mended in JTG/T 3360-01—2018 Wind-resistant Design Specification for Highway Bridg-es tends to be conservative in predicting the buffeting responses and can be used in the preliminary design of large-span bridges. The measured turbulent field parameters can well estimate the bridge buffeting responses, especially in the transverse direction. Meas-uring wind speeds at the bridge site is crucial for the rational design and construction of cable-stayed bridges in strong marine wind environments. The effectiveness of vibration reduction decreases in the order of temporary piers, inclined struts, tuned mass dampers, and wind-resistant cables. As the addition of temporary piers during the construction of a sea-crossing bridge will significantly increase construction costs, while the inclined strut scheme only requires setting up temporary steel structures near the main tower and piers without significantly increasing construction workload, therefore, the inclined strut scheme is recommended.