Abstract
The answers are summarized as follows: 1. In estimating maximum deformation, the total energy input is one of the approximate methods based on energy balance. 2. The authors did not use the concept of instantaneous energy input. In estimating maximum deformation, the instantaneous energy input cannot avoid to be assumed value. 3. In reducing one-degree freedom system, damage distribution is presupposed, but it does not become practical limitation of applicability of equivalent linearization method, because the mechanism confirmation is indispensable in seismic design of building structure. 4. It is considered that the design criteria should not be the value, which has advantage in estimating the response by energy balance, but the value, which describe the limit states of building structure appropriately. From the practical standpoint, the authors consider that the maximum deformation is most appropriate value, which define the limit states of building structure.
