Input Energy that produced by ground motions in structures, is an important factor in structural analysis. In this study, wavelet transform is used as one of the useful tools in engineering for evaluating input energy and its effect on structure. Ground motion with specified frequency content are decomposed into different signals with the help of wavelet transform that each new signal covers specified frequency content of the main signal. As a result of this transform, input energy as one of the most important factors that effects on structural damage is studying using different signals with different frequency bandwidth. Input energy of 5-story structure under different near to far distance ground motions are studied using this procedure. The results illustrated the relationship of input energy and frequency content of earthquakes.
