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It is necessary to study the behavior of energy response of elasto-plastic multi-mass systems to develop the earthquake resistant design based on the energy concept.In this paper, for the purpose of getting fundamental information about the behavior of energy response in elasto-plastic multi-mass systems, six mass systems which represent the systems having bi-linear hysteretic restoring force and subjected to sinusoidal excitation are used in the numerical analysis. The response characteristics of elasto-plastic multi-mass systems is examined basically and the linearized estimation of input energy for them is analyzed by the method of modal analysis. The control method of input energy distributed to each story of multi-mass systems is represented.

CONTROL OF INPUT ENERGY FOR ELASTO-PLASTIC MULTI-MASS SYSTEMS SUBJECTED TO SEISMIC MOTION