A　building　may　be　subjected　to　multiple　accidental　loads　during　its　service-life.　Partially　precast　concrete　(PC)　beam　is　a　primary　force-bearing　member.　When　subjected　to　an　impact　load,　its　impact　resistance　will　significantly　affect　the　overall　safety　of　the　structure.　In　this　study,　five　PC　beams　were　designed　and　manufactured,　and　drop-hammer　impact　tests　were　performed.　The　influences　of　impact　mass　and　impact　height　on　the　failure　mode　and　the　dynamic　response　of　the　component　under　different　loading　conditions　were　examined.　The　typical　failure　mode　of　the　test　beam　under　a　dynamic　load　was　derived　from　the　failure　mode　and　crack　distribution.　The　dynamic　responses　such　as　impact　force,　supporting　reaction　force,　and　displacement-time-history　curve　were　obtained　by　the　test.　With　increasing　impact　energy,　the　peak　impact　force　increased　from　3,353　to　3,708　kN,　the　peak　mid-span　displacement　increased　from　33.6　to　47.3　mm,　and　the　residual　mid-span　displacement　increased　from　11.9　to　15.1　mm.　Subsequently,　the　law　of　energy　dissipation　in　the　impact　process　was　analyzed　using　the　combined　curves　of　the　impact　force-mid-span　displacement　and　support　reaction　force-mid-span　displacement.　Furthermore,　the　result　obtained　by　the　integration　of　the　reaction　force-displacement　curve　in　the　middle　of　the　span　is　more　suitable　for　evaluating　the　overall　energy　consumption　of　the　beam.　The　vibration　energy　and　internal　energy　of　the　beam　itself　account　for　the　primary　part　of　the　remaining　energy.