Abstract
This paper refers to the effect of an elasts-plastic characteristic of substructure on the earthquake response of multistory building. It is assumed that both of the main structure and the substructure have bi-linear hysteretic restoring force represented by the various types of the elasto-plastic property. Thus the earthquake responses of such structures to the idealized ground motion are analyzed by using an electronic analog computer. Concerning to the maximum story distortion and the maximum overturning moment of the structure, their responses are discussed here. Consequently some of conclusions are shown as follows: The characteristic of foundation conpliance and duration of ground motion have an important effect upon the earthquake responses of structure. If the elastic rigidity of the substructure is smaller than that of the main structure, the responses of the main structure are essentially affected by the rigidity of substructure, never theless they are hardly influenced by the plastic yield value of the substructure or amplitudes of the ground acceleration. On the other hand, the rigidity of the substructure being larger, the responses are affected by the variation of the plastic yield values. These results show us the existence of the critical distribution with regard to the effect of the elasto-plastic characteristic of the substructure on the maim structure, and then the critical distribution should be determined not only by the distribution of elastic rigidity but also by that of the plastic yield value.
