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.