Offshore　wind　turbines　are　often　constructed　on　the　foundation　of　soft　clay,　which　often　experience　strength　and　stiffness　weakening　and　internal　plastic　strain　under　cyclic　loading.　These　changes　in　the　mechanical　properties　of　soft　clay　foundation　can　negatively　impact　the　normal　operation　of　the　upper　turbine.　Due　to　the　complexity　of　the　mechanical　properties　of　soft　clay,　most　of　the　existing　cyclic　pile-soil　load　transfer　models　for　soft　clay　foundations　are　based　on　hyperbolic　models,　which　are　more　complicated　and　less　efficient.　To　address　this　problem,　this　paper　introduces　a　mechanical　model　that　can　describe　the　cyclic　weakening　characteristics　of　soft　clay　in　pile-soil　interaction,　and　realizes　the　weakening　characteristics　of　the　soil　with　the　cyclic　loading　by　using　ABAQUS　subroutine　secondary　development.　By　introducing　the　cyclic　weakening　model　of　soft　clay　into　the　numerical　simulation　of　pile-soil　model,　the　weakening　law　of　side　resistance　of　pile　with　the　number　of　cycles　is　obtained.　The　pile　side　load　transfer　model　under　the　traditional　static　condition　is　improved,　and　a　trilinear　model　of　pile　side　load　transfer　that　can　consider　the　cyclic　weakening　effect　of　soft　clay　is　proposed;　in　addition,　the　calculation　method　of　pile　foundation　vertical　bearing　capacity　is　established　according　to　the　load　transfer　method　which　can　consider　the　cyclic　weakening　effect　of　soft　clay,　and　compared　with　the　model　test　results　in　the　existing　literature,　the　correctness　and　effectiveness　of　the　calculation　method　of　pile　foundation　vertical　bearing　capacity　considering　the　cyclic　weakening　effect　of　soft　clay　proposed　in　this　paper　are　verified.　Finally,　the　method　is　applied　to　the　actual　project　of　an　offshore　wind　power　pile　foundation,　and　the　vertical　bearing　capacity　of　offshore　wind　power　pile　foundation　is　calculated.　©　2024　Elsevier　Ltd