This　paper　presents　the　results　of　vibration　tests　for　a　full-scale　beam-column　connection　which　is　damaged　by　earthquake-type　cyclic　loading.　A　specimen　was　consisted　of　a　hollow　steel　section　column　and　composite　beams　with　an　H-section.　At　each　damage　level,　the　specimen　was　excited　dynamically　using　a　modal　shaker.　The　primary　interest　of　the　tests　is　to　examine　the　relationship　between　the　changes　in　the　dynamic　characteristics　of　the　connection　and　the　type　and　level　of　seismic　damages.　The　tests　and　associated　supplemental　analytical　study　showed　that　floor　slab　damage,　which　distributed　along　longitudinal　axis　of　the　beams,　decreased　the　natural　frequency　of　the　connection　while　fracture,　which　concentrated　at　beam-ends,　had　little　impact　on　the　natural　frequency.　COPYRIGHT　©　2014　by　the　Society　of　Nuclear　Medicine　and　Molecular　Imaging,　Inc.