Cable-Beam Vibration Correlation of Railway Low-Pylon Cable-Stayed Bridge Subjected to Train Load

In order to investigate the vibration correlation of a low-pylon cable-stayed bridge and its cable components under different running speeds, the interaction between the whole structure and its cables was considered by taking a railway low-pylon cable-stayed bridge with a main span of 115 m+95 m as an engineering background, and the vibration responses of beams and towers and the local vibration responses of cables were obtained with the method of numerical integration based on the train-track-bridge coupling vibration theory. The research result indicates that the cable-beam vibration correlation under a train load is essentially an energy transfer process. The vibration energy transfers easily in the condition that the frequency of displacement excitation at cable end is close to the nature frequency of cables. When a train is passing through a bridge at a design speed of 225 to 350 km/h and the excitation frequency is close to the nature frequency of cables, the resonance of cables will occur under external excitation, but the resonant amplitudes are not great, local vibration amplitudes of cables being less than 3 mm.