The　integral　abutment　jointless　bridge　(IAJB)　has　lots　of　advantages,　so　it　has　been　widely　used　in　western　countries.　The　pile　foundation　of　IAJB　requires　higher　horizontal　deformation　capacity.　H-beam　steel　piles　are　often　used　to　construct　integral　bridges　in　the　west,　while　RC　piles　are　mainly　adopted　in　China.　Lots　of　studies　and　engineering　examples　show　that　the　application　of　RC　piles　can　meet　the　deformation　requirements　of　IAJBs,　but　the　influence　of　the　earth　pressure　behind　abutment　on　RC　piles　is　not　clear.　Therefore,　based　on　a　practical　IAJB　in　China　as　an　engineering　background,　with　certain　RC　pile　reinforcement　ratio　and　the　shape　of　the　section　as　parameter,　four　integral　abutment-RC　pile　test　models　were　designed.　The　reciprocating　low-cycle　pseudo-static　test　on　interaction　of　integral　abutment-H-shaped　pile-soil　was　carried　out　to　study　the　hysteretic　behavior,　lateral　deformation　law　and　interactive　mechanism.　The　test　results　show　that　under　the　reciprocating　displacement　loading,　the　soil　behind　the　abutment　will　be　emptied,　and　the　failure　positions　of　the　specimens　are　mainly　concentrated　at　the　connection　between　the　bottom　of　the　abutment　and　the　top　of　the　pile.　Increasing　the　reinforcement　ratio　of　RC　piles　or　using　rectangular　section　RC　piles　can　lower　the　failure　positions　and　improve　their　mechanical　properties.　The　hysteretic　curve　of　the　integral　abutment-RC　pile-soil　system　is　full　in　the　first　quadrant,　indicating　better　energy　dissipation　capacity,　while　the　third　quadrant　hysteretic　curve　has　a　smaller　covering　area.　The　experimental　results　also　show　that　the　abutment　movement　can　be　regarded　as　a　rigid　displacement　with　rotation,　and　under　the　action　of　reciprocating　displacement　beyond　the　limit　of　elastic　deformation,　the　abutment　and　the　pile　appear　obvious　cumulative　deformation.　Besides,　the　relative　angle　between　abutment　and　pile　head　increases　as　the　damage　degree　increases.　Accordingly,　by　increasing　the　reinforcement　ratio　of　RC　piles　or　adopting　rectangular　section　RC　piles,　1)　the　energy　dissipation　capacity　of　the　whole　bridge-RC　pile-soil　system　can　be　increased;　2)the　elastic　cracking　displacement　of　RC　piles　can　also　be　increased,　which　leads　to　its　later　yield　and　failure　and　increases　the　bearing　capacity　of　the　whole　system;　3)　the　stiffness　degradation　rate　and　degradation　amplitude　of　the　system　are　significantly　reduced;　4)　the　failure　of　bridge　abutment　and　pile　joint,　along　with　the　accumulated　deformation,　can　be　effectively　reduced.　©　2021,　Editorial　Office　of　Rock　and　Soil　Mechanics.　All　right　reserved.