Concrete　arch　bridge　with　steel　webs　is　a　modification　of　the　conventional　reinforced　concrete　arch　bridge　by　replacing　the　concrete　webs　with　the　corrugated　or　plain　steel　webs.　In　this　study,　a　finite　element　model　of　the　reinforced　concrete　arch　bridge　and　the　concrete　arch　bridge　with　corrugated　or　plain　steel　webs　were　developed　using　a　nonlinear　finite　element　program　NL-Beam3D,　and　their　nonlinear　seismic　responses　were　studied　and　compared.　The　results　demonstrate　that　axial　force　and　out-of-plane　bending　moment　are　predominant　under　out-of-plane　seismic　excitations,　and　the　materials　at　the　arch　springing　have　reached　the　plastic　stage.　On　the　other　hand,　axial　force　and　in-plane　bending　moment　are　predominant　under　longitudinal　seismic　excitations,　and　the　materials　still　remain　in　the　elastic　state.　It　is　also　found　that　seismic　responses　under　out-of-plane　excitations　are　greater　than　that　under　longitudinal　excitations.　For　concrete　arch　bridges　with　steel　webs,　it　is　unnecessary　to　consider　the　effects　of　synchronous　out-of-plane　and　longitudinal　seismic　excitations.　RC-PSW　arch　bridge　has　better　seismic　performance　than　RC-PSW　arch　bridge.