Abstract: This paper presents an experimental research on a tuned particle damper attached to a scaled continuous viaduct. A simplified mechanical model for the damper used in finite element method was established to simulate the controlling effects of the damper. An analytical energy method was established to estimate the equivalent additional damping ratio of the damper. The experimental and computational results show that tuned particle dampers can effectively reduce the seismic response of the model bridge. The simplified mechanical model and the analytical energy method are effective in simulating the controlling effects of the tuned particle damper. The simplified mechanical model and the analytical energy method provide certain theoretical guidance for the application of particle damping in civil engineering.