In　order　to　improve　the　accuracy　of　the　calculation　method　of　the　bearing　capacity　of　the　prefabricated　pier　connected　by　the　grouting　bellows,　the　calculation　formula　of　the　ultimate　bearing　capacity　of　assembled　bridge　piers　with　grouting　corrugated　pipe　connection　under　the　action　of　bi-directional　compression　and　bending　is　deduced.　Firstly,　the　quasi-static　testing　of　cast-in-place　piers　and　prefabricated　piers　under　unidirectional　and　bi-directional　loading　are　introduced,　the　ultimate　bearing　capacities　are　compared.　Secondly,　according　to　the　arrangement　position　of　the　neutral　axis　and　the　static　force　balance　relationship,　the　calculation　formulas　of　the　ultimate　bearing　capacity　in　two　directions　under　the　action　of　constant　axial　force　are　deduced.　Finally,　the　calculation　formulas　of　derivation　were　verified　by　the　experimental　results,　and　the　calculated　yield　surfaces　of　the　prefabricated　piers　with　grouting　corrugated　pipe　connection　under　different　axial　forces　are　established.　The　results　show　that　the　experimental　results　are　relatively　close　to　the　numerical　calculation　results,　the　average　error　does　not　exceed　10%,　and　the　P-Mx-My　three-dimensional　yield　surface　provided　a　relatively　simple　and　quick　method　for　the　cross-sectional　safety　verification　of　precast　segmental　piers　with　Grouting　Corrugated　Pipe　Connection.　©　Published　under　licence　by　IOP　Publishing　Ltd.