Ganjiang Super-large Bridge on Nanchang-Ganzhou Passenger Dedicated Line,with a span of over 300 m,is the first ballastless track high-speed railway cable-stayed bridge in China.To investigate the service performance of high-speed railway cable-stayed bridges and verify its design theory,a structural health monitoring system was designed and implemented for the bridge.The deflection,support displacement,vibration,and strain parameters of the bridge were analyzed,and the structural state was evaluated by the system.The results demonstrate that:(1)the deflection change of the main beam and the displacement change of the beam end are both less than the safety limit,indicating that the structural deformation is normal.(2)The maximum vertical vibration acceleration amplitude in the main span is 0.121 m/s2,which is smaller than that in the vehicle bridge coupling analysis of 0.125 m/s2.The beam is of good vibration performance and operational comfort,and its structural fundamental frequency is consistent with the design.(3)The strain of the main beam is affected by the temperature,and the overall amplitude of the change is about 64 με,The conversion stress is 13.44 MPa,which is less than the design limit,indicating structural stress safety.The above results indicate that the overall condition of the Ganjiang Grand Bridge is in normal health and good service performance condition.
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