The new seismic design code adopted for railway structures in Japan is system to check whether the response calculated through dynamic analysis satisfies the seismic performance of railway structures. To aim at a seismic design method, it is necessary to quantitatively evaluate the bearing capacity and ductility of members that compose a structure. Based on the results of cyclic loading tests of members, this paper proposes quantitative evaluation of bearing capacity and ductility correspondent to the damage degree of reinforced concrete members.