Wavelet-based
generation of spectrum-compatible time-histories
Sushovan Mukherjee and Vinay K. Gupta
Department of Civil Engineering, Indian Institute of Technology, Kanpur–208016,
India
This paper deals with the well-known problem of generating
spectrum-compatible synthetic accelerograms for the linear and non-linear
time-history analyses of structural systems. A wavelet-based procedure has been
used to decompose a recorded accelerogram into a desired number of
time-histories with non-overlapping frequency contents, and then each of the
time-histories has been suitably scaled for matching of the response spectrum of
the revised accelerogram with a specified design spectrum. The key idea behind
this iterative procedure is to modify a recorded accelerogram such that the
temporal variations in its frequency content are retained in the synthesized
accelerogram. The proposed procedure has been illustrated by modifying five
recorded accelerograms of widely different characteristics such that those are
compatible with the same USNRC design spectrum.
Author Keywords: Strong motion synthesis;
Spectrum-compatible accelerograms; Time-history analysis; Wavelet transform