A new method for modification of ground motions using wavelet transform and enhanced colliding bodies optimization

In this paper a simple and robust approach is presented for spectralmatching of groundmotions utilizing thewavelet transform and an improvedmetaheuristic optimization technique. For this purpose, wavelet transform is used to decompose the original ground motions to several levels, where each level covers a special range of frequency, and then each level is multiplied by a variable. Subsequently, the enhanced collidingbodiesoptimization technique is employed to calculate thevariables such that theerrorbetween eywords: pectrum-compatible ground motions avelet transform esponse spectrum nhanced colliding bodies optimization the response and target spectra is minimized. The application of the proposed method is illustrated through modifying 12 sets of ground motions. The results achieved by this method demonstrate its capability in solving the problem. The outcomes of the enhanced colliding bodies optimization (ECBO) are compared to those of the standard colliding bodies optimization (CBO) to illustrate the importance of the enhancement of the algorithm. © 2016 Elsevier B.V. All rights reserved.