Combincd　with　the　mechanical　behaviors　of　concrete　arch　ring　web　and　the　material　propcrtics　of　ultra-high　Performance　concrete　(UHPC),　the　prefabricated　assembly　UHPC　butterfly　web　was　proposed　to　rcplace　the　cast-in-place　concrete　web.　Subsequently,　a　new　type　of　concrete　arch　structure　with　UHPC　butterfly　web　was　developed　to　reduce　the　self-weight　and　construction　difficulties.　The　Wumengshan　Bridge　with　a　span　of　270　m　was　takcn　as　the　prototype,　the　UHPC　butterfly　web　was　used　to　replace　the　steel　truss　web　of　the　original　steel　truss-concrete　composite　arch　ring,　then　a　trial　design　was　carried　out　for　this　new　type　of　concrete　arch　bridge.　The　research　results　show　that　in　the　construction　process,　the　Stresses　in　thc　arch　ring　at　the　maximum　cantilever　stage　and　thc　completion　of　cast-in-placc　of　thc　middlc　box　top　and　bottom　plates　are　within　allowable　limits,　and　the　first-order　elastic　Overall　stability　coefficients　arc　12.02　and　4.12,　respectively.　Thc　strength,　overall　strength-stability,　and　deformation　verifications　of　the　arch　ring　all　meet　the　requirements　of　specifications.　Compared　with　the　steel　truss-concrete　composite　arch　ring,　the　weight　increased　by　UHPC　is　similar　to　that　reduced　by　steel,　and　the　self-weight　of　the　trial　design　arch　ring　only　increases　by　5%.　However,　the　material　cost　reduces　by　21%.　Additionally,　the　out-of-plane　bending　stiffnesses　of　arch　foot　and　vault　sections　in　the　trial　design　arch　ring　increase　by　25%　and　32%,　respectively,　and　axial　forces　of　critical　sections　only　increase　by　3.　8%-6.　2%.　Due　to　the　optimization　on　the　arch　axis　coefficient,　the　bending　moments　of　arch　foot　and　vault　sections　reduce　at　most　by　37.0%　and　22.5%,　respectively.　Compared　with　the　prototype　bridge,　the　natural　Vibration　frequency　of　the　trial　design　arch　bridge　is　larger　with　the　maximum　increment　of　only　8.　5%,　which　has　little　effect　on　the　dynamic　characteristics　of　the　arch　bridge.　In　summary,　the　research　results　have　good　theoretical　significance　and　practical　application　values　for　promoting　thc　technical　progress　of　concrete　arch　bridges.　©　2025　Chang＇an　University.　All　rights　reserved.