The　response　of　concrete　under　an　impact　load　is　closely　related　to　the　loaded　stress　state　and　the　strain　rate.　Numerical　analysis　faces　challenges　such　as　constitutive　model　complexity,　large　parameter　numbers,　and　difficulties　associated　with　engineering　applications.　This　paper　presents　a　method,　based　on　the　elasto-plastic　damage　cap　model,　for　determining　the　damage　parameters　and　the　rate-dependent　parameters　of　the　concrete　constitutive　model,　considering　the　concrete　damage　characteristics　under　the　stress　states　of　tension,　compression,　and　torsion.　Then,　regarding　the　bending　and　shear　failure　modes　of　reinforced　concrete　(RC)　members　subjected　to　impact　loading,　the　reliability　of　the　parameter　values　for　the　concrete　constitutive　model　is　verified　and　validated　by　experiments　on　the　RC　members.　The　focus　is　the　dependency　of　the　damage　parameters　on　the　element　size　and　the　necessity　of　simulating　shear　dilation　damage.　Two　commonly　used　elasto-plastic　damage　cap　models　are　also　compared.　Then,　a　navigational　bridge　failure　accident　induced　by　a　vessel　collision　is　simulated　and　verified.　The　results　indicate　that　the　proposed　parameter　calibration　method　effectively　predicts　the　damage　evolution　and　the　dynamic　responses　of　the　RC　members　under　impact　loading.　It　addresses　application　challenges,　such　as　the　calibration　of　excessively　many　parameters　in　the　elasto-plastic　damage　cap　model,　and　provides　a　reference　for　the　numerical　analysis　of　impact　on　concrete　bridge　structures.　©　2024　Chang＇an　University.　All　rights　reserved.