The　low　stiffness　of　pultruded　glass　fiber　reinforced　polymer　(pGFRP)　flexural　members　has　been　one　of　the　main　issues　limiting　their　possible　applications　ever　since　this　type　of　material　was　invented.　In　this　regard,　curvedpultrusion　technique　is　adopted　in　this　work　to　produce　GFRP　arch　beams,　and　a　new　GFRP　beam-string　structure　is　proposed.　Specifically,　experimental,　numerical,　and　analytical　programs　were　conducted　to　investigate　the　flexural　performance　of　curved-pultruded　GFRP　arch　beams　subjected　to　varying　boundary　conditions.　The　flexural　strength　and　stiffness　were　successfully　enhanced　by　up　to　27%　and　109%,　respectively,　which　was　attributed　to　the　arch　mechanism　enabled　by　proposed　GFRP　beam-string　structure.　In　addition,　the　progressive　failure　of　GFRP　material　and　the　imperfect　load-transfer　between　GFRP　arch　beam　and　tension　string　were　investigated　through　finite　element　modeling.　Then,　web　crippling　strength　of　GFRP　arch　beams　was　predicted　with　modifications　to　an　existing　model,　and　internal　forces　of　beam-string　were　analyzed.　The　GFRP　beam-string　structure　proposed　in　this　work　effectively　sheds　light　on　possible　approach　to　improve　the　flexural　stiffness　of　pGFRP　members,　and　with　successful　demonstration　of　this　work,　it　is　rationally　believed　that　possible　applications　of　curved-pultruded　GFRP　members　can　be　greatly　broadened.