During dynamic analysis of framework , according to mechanical performance of reinforced concrete frame structure under seismic force , the element of beam and column can be simplify into 5 pole element whose stiffness is variable . then damage model of 5 pole elements with variable rigidity can be established if the damage parameters based on elastic transformative energy are generalized into pole elements 針對地震力作用下鋼筋混凝土框架結構梁柱的受力特性,對框架進行動力分析時將梁柱構件簡化為五段變剛度桿單元,將基于彈性變形能的損傷指標推廣到桿件,建立了該五段變剛度桿單元的損傷模型。