Field Investigation Of The Wind And Vortex-Induced Vibration Response Of Quanzhou Bay High-Speed Railway Cable-Stayed Bridge

Based on the long-term continuous field observation of the wind on the North Shore of Quanzhou Bay Sea Crossing Bridge,this paper deeply analyzes the wind characteristic parameters of field measurement,and carries out the numerical simulation study of vortex-induced vibration of the bridge.The research results can provide a reliable reference for the wind resistance design and later operation and maintenance of bridges.The main work is as follows:(1)Based on a large amount of measured data from the observation station,the values of the wind field characteristic parameters and their influencing factors at the Quanzhou Bay Bridge site are studied.The similarities and differences between the wind field characteristics of the North Shore Observation Station and the wind field characteristics of the bridge deck are compared and analyzed.Southwest wind prevails at the bridge site in summer,and northeast wind prevails in other seasons.The average wind characteristics of the two measuring points are basically the same,and the fluctuating wind characteristics are different.(2)The flow field calculation model and structural motion model are established,the solution process of fluid-structure coupling of vortex-induced vibration is sorted out,and the vortex-induced vibration UDF calculation program suitable for single amplitude and parallel sections is compiled,and the correctness and feasibility of the calculation model and the self-compiled UDF program is verified.(3)Based on the FLUENT finite element software,the fluid-structure interaction numerical simulation model is established.The influence of damping ratio on the vortex-induced vibration response of Quanzhou Bay Bridge is discussed,and the vortex-induced vibration locking interval and maximum response amplitude,as well as the vortex shedding pattern is obtained.And when the double-amplitude highway bridge at a distance of 85m(center distance)exists,the vortex-induced vibration response of the two bridges are calculated.It is obtained that under the standard damping ratio of 1%,the bridge only produces weak vortex vibration;the maximum amplitude is 0.41 m under the damping ratio of 0.2%,and the phenomenon of beat is captured.When parallel to the highway bridge,the locking interval is divided into two parts.94 figures,21 tables,70 references...