Abstract
The objective of this paper is to propose the method for estimating the nonlinear response of the structure with SDOF. The characteristics of the method is as follows: Maximum index based on kinetic energy of earthqueke ground motion is used as the characteristics of earthquake ground motion to represent the non-linear response of structure. The normarized energy index is related with normarized potential energy of structure response. The method to estimate maximum ductility factor by use of frequency characteristics of maximum index is proposed by developing the relationship mantioned second characteristics. The applicability was confirmed by the comparison with the maximum ductility factor calculated by non-linear seismic response of structure with SDOF.
