In　prefabricated　wind　power　foundations,　prefabricated　modules　are　assembled　into　a　unified　structure　using　prestressed　shear　key　tooth　splicing　joints.　Key-tooth　splicing　joint　is　one　of　the　primary　forms　of　dry　splicing　used　in　assembly　buildings　and　segmental　assembly　bridges　engineering.　It　is　necessary　to　take　the　compressive　strain　of　concrete　at　the　edge　of　the　compression　zone　as　the　failure　state　to　constitute　flexural　capacity　calculation　method　for　the　assembled　beam　with　double-bond　tooth-shaped　dry　joints.　Based　on　the　plane　section　assumption,　force　balance　theory,　sectional　equilibrium　and　deformation　coordination　mechanism　are　illustrated　considering　the　mechanical　characteristics　of　unbonded　prestressed　tendons　and　the　elastic-plastic　constitutive　model　of　concrete.　Based　on　ABAQUS　finite　element　analysis,　flexural　behaviors　are　analyzed　and　to　examine　the　bending　performance　and　failure　state　of　double-bond　tooth-shaped　dry　joints　under　various　initial　local　compressive　stresss.　The　proposed　calculation　formula　for　bending　capacity　are　verified　finally　and　gets　good　agreements　with　the　finite　element　analysis　results.　©　The　Author(s),　under　exclusive　license　to　Springer　Nature　Singapore　Pte　Ltd.　2024.