To　study　on　the　mechanical　properties　of　AQ315,　a　new　kind　of　steel,　experiments　under　monotonic　and　cyclic　loading　were　conducted　and　the　failure　modes　were　analyzed.　The　skeleton　curves　of　AQ315　steel　under　cyclic　loading　have　been　obtained　by　curve　fitting　using　the　Ramberg-Osgood　model.　Based　on　the　Chaboche　plastic　constitutive　model,　the　isotropic　hardening　and　kinematic　hardening　parameters　were　calibrated　according　to　the　test　data,　and　the　cyclic　loading　tests　have　been　simulated　using　ABAQUS.　The　results　show　that　the　average　yield　and　ultimate　strength　of　AQ315　steel　are　290　MPa　and　450　MPa,　respectively;　the　average　elongation　after　fracture　of　AQ315　steel　is　35.6%;　AQ315　steel　exhibits　a　large　degree　of　cyclic　hardening;　the　Ramberg-Osgood　model　fits　the　skeleton　curves　well　under　cyclic　loading;　the　finite　element　results　can　simulate　the　hysteretic　curves　of　AQ315　accurately　with　the　calibrated　hardening　parameters.　©　2020,　Editorial　Office　of　China　Civil　Engineering　Journal.　All　right　reserved.