Concrete　arch　bridges　with　steel　webs　can　be　regarded　as　a　new-type　composite　arch　bridge.　In　such　bridges,　the　concrete　webs　of　the　RC　arch　ribs　are　replaced　by　steel　webs　such　as　corrugated　or　plannar　webs　and　then　connected　to　the　ribs.　Based　on　a　double　nonlinear　finite　element　program-NLBeam3D,　the　nonlinear　seismic　response　characteristics　of　the　aforementioned　bridges　and　a　traditional　RC　arch　bridge　have　been　studied　and　compared　in　this　paper.　The　analysis　results　demonstrate　that　the　axial　forces　and　out-of-plane　bending　moments　in　the　arch　ribs　of　the　new-type　bridge　are　predominant　under　transverse　seismic　excitations,　which　is　similar　to　those　of　the　RC　arch　bridge.　And　the　materials　at　the　arch　springing　enter　the　plasticity　stages.　On　the　other　hand,　the　axial　forces　and　in-plane　bending　moments　are　predominant　under　longitudinal　seismic　excitations.　But　the　materials　still　stay　in　their　elasticity　stages.　It　is　also　found　that　the　seismic　responses　of　the　arch　ribs　under　transverse　excitations　are　greater　than　those　under　longitudinal　excitations.　And　for　concrete　arch　bridges　with　steel　webs,　the　seismic　effects　under　both　transverse　and　longitudinal　excitations　can　be　neglected　in　the　analysis.　Furthermore,　compared　with　the　RC　arch　bridge,　the　seismic　responses　of　the　new-type　bridge　is　smaller　representing　better　seismic　performance.