With　increase　in　accidents　involving　vehicles　hitting　bridge　piers,　anti-impact　Performance　of　prefabricated　segmental　bridge　piers　attracts　widespread　attention.　Here,　to　effeetively　control　relative　slip　between　prefabricated　Segments　and　improve　their　anti-impact　Performance,　a　3D　finite　element　model　for　vehicle　to　impact　bridge　pier　was　established　to　analyze　local　failure　mechanism,　and　the　method　to　use　shear　keys　and　embedded　shape　memory　alloy　(SMA)　steel　bars　was　proposed.　The　study　results　showed　that　prefabricated　segmental　bridge　piers　have　local　shear　failure　under　impact　load　of　vehicles,　and　a　dynamic　shear　strength　calculation　method　based　on　theoretical　derivation　is　proposed,　its　calculation　value　is　smaller　than　that　of　cast-in-place　pier;　using　shear　keys　can　effeetively　control　relative　displacement　between　Segments　to　make　the　overall　deformation　of　prefabricated　segment　piers　shift　from　shear　type　to　bending　type　under　vehicle　impact　load;　SMA　steel　bars　embedded　in　prefabricated　segmental　piers　also　have　a　better　effect　on　Controlling　relative　displacement　and　improving　the　overall　anti-deformation　ability　of　prefabricated　segmental　bridge　piers.　©　2024　Chinese　Vibration　Engineering　Society.　All　rights　reserved.