Abstract
Elastic and inelastic responses of 7-story, single-bay frame structures the restoring force characteristics of which can be expressed in terms of the dynamic characteristics of the elasto-plastic local joints are presented in order to obtain the aseismic design data of structural elements such as columns and girders. The stiffness distribution of the structural members to control, uniformly, the root mean square responses of local ductility ratios due to random excitation is quite different from the distribution obtained from the similar responses with respect to relative displacements in the case of the structure with weak girders. Inelastic local responses of the structure with weak girders seem to be distributed uniformly for different excitations, while the distribution of the responses of the structure with weak columns are rather affected by the characteristics of ground motion. As the plastic deformation of the base column of structures designed by small value of the base shear coefficient tends to be accumulated, the capacity of axial deformation of the column member should be examined carefully and the suitable selection of the base shear coefficient will be recommended to control the plastic behavior in axial deformation.
