In the past, it was shown that H-shaped beams with large depth-thickness ratio are useful as a seismic design beam. But, under cyclic loading, the characteristics of these beams have not been examined enough. So in this study, the cyclic behavior, plastic deformation capacity and energy absorption ability of H-shaped beams having larger depth-thickness ratio than the limit of current standard are examined by cyclic experiments and numerical analysis. And the new limit value of plate slenderness are proposed. The plate local post-buckling behaviors of these beams are considered and modeled for progressive use in the future.%H形断面梁の耐力および塑性変形能力を支配する主な要因としrnて，構成板要素の幅厚比が挙げられる．そのため塑性変形能力と構rn成板要素の幅厚比に関する研究はこれまでも多数行われており，そrnれらの研究成果は設計規準および各種指針類に取り入れられていrnる．
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