In　order　to　swiftly　assess　the　probability　of　a　bridge　structure　reaching　a　specific　damage　state,　seismic　vulnerability　models　for　regular　highway　girder　bridges　and　a　simplified　method　for　their　calculation　are　established,　based　on　the　results　of　a　nonlinear　dynamic　time　history　analysis.　Depending　on　the　type　of　bridge,　column,　and　design　specification,　regular　highway　girder　bridges　are　divided　into　eight　categories,　with　80　benchmark　bridge　samples　constructed　for　each　category.　Columns　and　bearings　are　considered　vulnerable　components,　in　which　the　component　limits　for　different　bridge　damage　states　are　determined.　A　finite　element　model　of　bridge　samples　is　established　using　the　OpenSees　database.　By　employing　an　incremental　dynamic　analysis　approach,　seismic　vulnerability　models　for　regular　highway　girder　bridges　are　obtained.　Based　on　the　analysis　results,　a　new　simplified　formula　for　the　calculation　of　median　values　was　fitted　and　proposed　for　application　to　the　existing　regular　highway　girder　bridge　situation　in　China,　along　with　the　recommended　values　of　logarithmic　standard　deviation.　The　results　indicate　that　the　median　value　for　a　double-pier　bridge　increased　by　17%　compared　to　a　single-pier　type　and　that　of　a　continuous　type　increased　by　8%　compared　to　a　simply　supported　bridge.　Also,　the　efficiency　of　the　latest　design　code　increase　by　7%　compared　to　its　former　version.　The　results　computed　using　the　proposed　simplified　formula　showed　a　good　correlation　with　the　categorical　vulnerability　models,　with　a　mean　square　error　and　root　mean　square　error　of　5.26%　and　5.95%,　respectively,　and　a　maximum　absolute　error　of　10.58%.　©　2018,　Editorial　Department　of　Journal　of　Southwest　Jiaotong　University.　All　right　reserved.