Abstract:
A total of 203 horizontal acceleration time histories recorded
between 1986 and 2001 are taken from the Indian strong-motion
database and their response spectra for different damping ratios are
analyzed, statistically. The observed damping modification factors are
compared with those available in scientific literature and national
seismic design codes. Contrary to the recommendations of various
seismic design codes, as observed by some past researchers as well,
the damping modification factors are found to be dependent on the
spectral period. Simplified empirical expressions are provided to
compute the damping modification factors while accounting for the
effects of spectral period and damping ratio.
