Hysteretic　behaviors　of　steel　members　are　of　great　significance　in　the　assessment　of　the　realistic　ultimate　capacity　of　steel　structures　subjected　to　dynamic　overloads　(e.g.　strong　earthquakes).　To　this　end,　this　paper　intends　to　develop　a　new　phenomenological　hysteretic　model　for　capturing　the　inelastic　behaviors　of　steel　equal-leg　angles,　which　is　extensively　used　in　a　latticed　steel　tower.　Specifically,　cyclic　tests　of　steel　angles　were　performed,　and　a　3D　finite　element　(FE)　model　is　developed　and　validated　based　on　the　experimental　results.　Numerical　parametric　analyses　are　then　performed　to　investigate　the　influences　of　slenderness　ratios,　width-to-thickness　ratios,　and　initial　imperfections　on　the　hysteretic　behaviors　of　steel　equal-leg　angles.　Based　on　the　parametric　results,　a　phenomenological　hysteretic　model　is　proposed　to　replicate　the　hysteretic　behaviors　of　steel　angles,　and　its　accuracy　is　demonstrated　by　further　comparing　against　the　experimental　results.　Finally,　the　proposed　phenomenological　hysteretic　model　is　coded　into　the　commercial　package　ABAQUS　and　used　to　simulate　the　dynamic　responses　and　collapse　of　a　latticed　tower　under　severe　earthquakes.　The　results　show　that　the　proposed　phenomenological　hysteretic　model　shows　high　fidelity　in　reproducing　the　nonlinear　hysteretic　behaviors　of　steel　equal-leg　angles　subjected　to　cyclic　loads.　This　research　can　enrich　the　existing　hysteretic　models　of　steel　members　and　provide　an　accurate　method　for　estimating　the　realistic　responses　of　steel　structures　subjected　to　strong　dynamic　overloads.