地盤特性を考慮した梁降伏型架構の適正設計

Abstract

In order to obtain the optimum base shear coefficient of plane frame structures and the stiffness/strength distribution of composed members subjected to the filtered random excitation, a method of optimization of structures which were composed by strong columns and weak beams with bi-linear hysteresis is presented.Equivalent linearization technique is introduced in the elasto-plastic beams of 3- and 5- story structures. Input excitation used in this study is white noise modified by the Kanai-Tajimi filter. Performance index is selected so as to minimize the sum of the second moment of cross section of columns and beams considering the constraints of ductility ratio of beams and fiber stress of column members. Root mean square responses as well as peak responses such as ductility ratio of beam rotation, base shear coefficient, stiffness/strength distribution of each member are theoretically obtained and compared with the results of simulated responses.