The　split-joint　is　a　weak　link　in　a　segmental　prefabricated　concrete　cap　beam.　To　study　its　shear　bearing　capacity，shear　performance　tests　and　finite　element　simulation　analysis　were　carried　out　on　the　key　tooth　epoxy　joints　in　the　cap　beam，and　it　was　found　that　the　simulated　shear　load-relative　slip　curves　and　the　cracking　failure　pattern　were　in　good　agreement　with　the　test　results.　The　parametric　analysis　of　epoxy　joints　was　performed　using　finite　element　models，and　the　influences　of　lateral　compressive　stress，concrete　strength　grade，internal　reinforcement　ratio，and　the　number，depth　and　inclination　angle　of　key　teeth　on　the　shear　bearing　capacity　of　epoxy　joints　were　discussed.　Results　show　that　the　failure　pattern　of　the　epoxy　joint　under　the　shear　force　was　brittle　failure.　The　shear　bearing　capacity　of　the　epoxy　joint　increased　with　the　growing　lateral　compressive　stress，concrete　strength　grade　and　internal　reinforcement　ratio　of　key　teeth.　In　the　cases　of　the　lateral　compressive　stress　rising　from　1　MPa　to　9　MPa，the　concrete　strength　grade　rising　from　C40　to　C80　and　the　internal　reinforcement　ratio　rising　from　0.5%　to　2.6%，the　shear　bearing　capacity　increased　by　71.3%，22.3%　and　14.8%，respectively.　Since　all　the　number，depth　and　inclination　angle　of　key　teeth　had　a　great　impact　on　the　shear　bearing　capacity　of　the　epoxy　joint，it　is　recommended　that　the　number　of　key　teeth　should　not　exceed　3，the　depth　should　not　exceed　105　mm，and　the　inclination　angle　should　not　exceed　45°　in　actual　projects.　Based　on　the　Gopal　formula，a　practical　calculation　formula　for　the　shear　bearing　capacity　of　epoxy　joints　was　also　established，and　the　values　calculated　using　this　formula　agreed　well　with　the　test　results　and　finite　element　analysis　results，indicating　that　it　can　be　used　to　calculate　the　shear　bearing　capacity　of　epoxy　joints.　©　2025　Tianjin　University.　All　rights　reserved.