Concrete-filled　round-ended　(CFRE)　steel　tubes　are　widely　used　in　civil　infrastructures.　Accurate　and　reliable　numerical　models　of　CFRE　steel　tube　are　significantly　important　to　mimic　the　actual　behavior.　This　study　presents　a　fiber　beam-column　model　to　simulate　nonlinear　behavior　of　CFRE　steel　tubes.　A　group　of　uniaxial　hysteretic　constitutive　models　was　defined　for　the　properties　of　the　material.　To　verify　the　reliability　of　the　presented　fiber　model,　a　large　number　of　numerical　computations　have　been　performed　by　the　fiber　model　and　a　traditional　refined　finite　element　model.　The　results　confirm　that　the　proposed　fiber　model　can　accurately　predict　the　nonlinear　behavior　of　CFRE　steel　tubes.　Finally,　two　empirical　models　for　the　prediction　of　the　axial　bearing　capacity　of　CFRE　steel　tube　columns　were　developed.　(C)　2020　Elsevier　Ltd.　All　rights　reserved.　Concrete-filled　round-ended　(CFRE)　steel　tubes　are　widely　used　in　civil　infrastructures.　Accurate　and　reliable　numerical　models　of　CFRE　steel　tube　are　significantly　important　to　mimic　the　actual　behavior.　This　study　presents　a　fiber　beam-column　model　to　simulate　nonlinear　behavior　of　CFRE　steel　tubes.　A　group　of　uniaxial　hysteretic　constitutive　models　was　defined　for　the　properties　of　the　material.　To　verify　the　reliability　of　the　presented　fiber　model,　a　large　number　of　numerical　computations　have　been　performed　by　the　fiber　model　and　a　traditional　refined　finite　element　model.　The　results　confirm　that　the　proposed　fiber　model　can　accurately　predict　the　nonlinear　behavior　of　CFRE　steel　tubes.　Finally,　two　empirical　models　for　the　prediction　of　the　axial　bearing　capacity　of　CFRE　steel　tube　columns　were　developed.　(C)　2020　Elsevier　Ltd.　All　rights　reserved.