Model Test Research on Vibration Control of Vehicle-Induced Box Girders Using TMD.

To explore the application of tuned mass damper (TMD) for controlling vibrations in rail box girder structures, a scaled model system for vehicle-rail-bridge coupling vibrations with a geometric similarity ratio of 10:1 is designed and manufactured based on the high-speed electric multiple units and CRTS-II plate ballastless-track-box girder structure, and the vibration damping effect of TMD on the roof plate and wing plate of box girder under different working conditions is analyzed, including different mass ratios, different positions and different installation quantities. The results show that the vibration damping effect when the TMD mass ratio is 0.02 is better than the vibration damping effect when the mass ratio is 0.01, and TMD with a larger mass ratio can be preferred under the condition of considering structural safety and economy; different TMD installation positions have different damping effects on the components of the box girder, and the vibration response at the installation of TMD plates is significantly suppressed; the vibration damping effect of installing two TMDs on the box girder structure is significantly better than that of installing one TMD, and its damping range is also improved. The research conclusion can provide a reference for the damping design of elevated rail box girder structure. [ABSTRACT FROM AUTHOR]