Abstract
This paper deals with the estimation of total energy put into structures under earthquakes. Using stochastic models of earthquake motion, the authors studied the relation between the total input energy and such parameters on ground motion as the maximum acceleration, duration time, the integral of squared acceleration and predominant period. As a result, the mean of input energy E can be expressed by E=mZ2maxCtTgSE or E=mPTgSE, where Zmax the mean of maximum acceleration, Ct is a factor directly related to duration time, Tg is predominate period, P is the mean of the integral of squared acceleration and SE, called as normalized input energy spectra, is a non-dimensional scalar depending on the distribution of power spectrum of earthquake motion and independent of the scale of the earthquake motion. The normalized input energy spectrum is also studied with actual earthquake motions. As a design spectrum, SE-T0relation can be represented by the bilinear model.
