In　order　to　improve　the　transverse　mechanical　property　of　prefabricated　voided　slab　bridges,　two　hinge　joint　improvement　methods　were　designed.　Specifically,　discontinuous　steel　bars　could　be　replaced　by　continuous　steel　plates　in　hinge　joint　junction　surfaces,　and　improved　hinge　joint　structures　and　grouting　materials　could　be　used.　A　local　model　test　method　was　adopted,　and　the　normal　and　tangential　strengths　of　the　hinge　joint　junction　surface　were　calculated.　The　formulas　for　calculating　the　flexural　and　shear　capacities　of　the　hinge　joint　junction　surfaces　with　discontinuous　steel　bars　and　continuous　steel　plates　were　proposed.　Research　results　indicate　that　the　errors　between　the　test　values　of　local　model　and　the　calculation　values　from　the　proposed　formula　for　calculating　the　flexural　and　shearing　capacities　are　less　than　10%,　so　it　is　proved　that　the　proposed　formula　can　accurately　calculate　the　bearing　capacities　of　hinge　joint　junction　surface　with　continuous　steel　plate.　For　full-depth　hinge　joints　without　steel　bars　in　junction　surfaces,　the　normal　strength　of　the　junction　surface　is　1.29　MPa,　which　is　39%　the　axial　tensile　strength　of　weak　side　concrete.　The　tangential　strength　of　the　junction　surface　is　0.45　MPa,　which　is　1.5%　the　axial　compressive　strength　of　the　weak　side　concrete.　Compared　with　the　hinge　joint　without　steel　bars　in　junction　surface,　the　normal　strengths　of　the　hinge　joint　junction　surfaces　with　discontinuous　steel　bars　and　continuous　steel　plates　increase　by　98%　and　73%,　respectively,　and　the　tangential　strengths　of　the　junction　surfaces　increase　by　71%　and　78%,　respectively.　The　normal　strength　of　partial-depth　hinge　joint　junction　surfaces　with　normal　concrete　is　1.30　MPa,　which　is　40%　the　axial　tensile　strength　of　the　weak　side　concrete.　The　tangential　strength　of　the　junction　surfaces　is　0.33　MPa,　which　is　1.1%　the　axial　compressive　strength　of　the　weak　side　concrete.　Compared　with　the　junction　surfaces　with　normal　concrete　grouting　full-depth　and　partial-depth　hinge　joints,　the　normal　strengths　of　the　junction　surfaces　with　UHPC　grouting　full-depth　and　partial-depth　hinge　joints　improve　by　13%　and　21%,　respectively,　and　the　tangential　strengths　of　the　junction　surfaces　improve　by　64%　and　94%,　respectivelytabs,　figs,　refs.　©　2022　Chang＇an　University.　All　rights　reserved.