The　reinforced　concrete　piles　(RC)　in　integral　abutment　bridges　(IABs)　are　challenging　to　meet　the　longitudinal　deformation　of　bridges　with　significant　lateral　stiffness.　The　H-shaped　steel　(HS)　piles　are　costly　and　prone　to　corrosion.　This　paper　proposes　a　new　form　of　pile　comprised　of　HS　and　RC　piles　in　series　to　meet　the　longitudinal　deformation　demand　of　IABs.　Tests　were　conducted　for　one　HS　pile　under　reciprocating　low-cycle　pseudo-static　test　and　two　HS-RC　stepped　piles　with　different　bending　stiffness　ratios　of　HS/RC　(0.25　and　0.5)　using　the　HS-RC　pile　test　model,.　The　influence　of　the　stiffness　ratio　on　the　mechanical　behavior　of　stepped　pile-soil　was　studied.　The　mechanical　behavior　of　the　stepped　pile　was　also　compared　with　single　HS　and　RC　piles.　and　the　applicability　of　the　m　and　p-y　curve　methods　to　the　calculation　of　horizontal　displacement　of　stepped　pile　is　discussed.　The　results　show　that　the　elastic　deformation　range　of　the　HS　pile　is　2　mm　to　25　mm,　and　its　horizontal　deformation　capacity　and　bearing　capacity　are　excellent.　As　the　stiffness　ratio　increases,　the　stepped　pile-soil　system’s　yield　displacement　and　yield　load　increased.　The　stiffness　ratio　has　no　significant　effect　on　the　failure　mode　of　the　piles.　The　hysteretic　ring　of　the　stepped　pile　shows　a　squeezing　shape　at　the　initial　loading　stage,　but　becomes　a　full　spindle　in　the　later　loading　stage.　The　stepped　pile　shows　an　excellent　energy　consumption　effect　and　a　horizontal　deformation　ability,　indicating　it　is　suitable　for　IABs.　The　m　method　has　better　accuracy　only　up　to　2　mm　displacement,　while　the　p-y　curve　method　still　has　higher　accuracy　within　15　mm.　©　2023,　Korean　Society　of　Civil　Engineers.