In　order　to　study　the　seismic　performance　of　stairs　in　steel　frame　structures,　two　1:2　scaled　test　models　of　stairs　with　damped　supports　and　fixed　supports　were　designed　and　manufactured,　and　the　quasi-static　tests　were　carried　out　under　constant　axial　force.　The　failure　modes,　hysteresis　performance,　energy　dissipation　performance　and　deformation　capacity　of　different　stairs　were　investigated,　and　the　working　mechanism　of　different　stairs　was　analyzed.　The　test　results　show　that　the　energy　dissipation　of　the　staircase　with　damped　supports　is　through　damping　effect,　which　changes　the　way　of　force　transmission　and　internal　force　distribution　of　the　staircase.　The　energy　dissipation　of　the　staircase　with　fixed　supports　is　through　the　damage　of　the　component　itself.　In　the　stage　of　failure,　the　deformation　of　the　platform　plate,　the　joint　of　the　inclined　beam　and　the　staircase　beam　of　the　staircase　with　fixed　supports　is　large,　and　the　severe　buckling　of　the　frame　beam　causes　the　failure　of　bearing　capacity.　The　hysteretic　loops　of　the　two　stairs　are　full　and　plump.　The　stiffness　of　the　stairs　with　damped　supports　is　smaller　in　the　initial　stage　of　loading,　but　later　reaches　or　even　exceeds　that　of　the　stairs　with　fixed　supports,　indicating　better　bearing　capacity.　The　horizontal　sliding　displacement　of　the　damping　support　is　larger,　which　is　beneficial　to　the　damper,　and　the　vertical　displacement　can　be　neglected.　The　vertical　stiffness　of　the　damping　support　effectively　controls　the　warping　of　the　pedal.　©　2021,　Editorial　Office　of　Journal　of　Building　Structures.　All　right　reserved.