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Ground Motion Analysis with the Use of the Short-Time-Response-Spectrum

The elastic response spectrum provides the engineer with two important elements of the seismic structural response: intensity and frequency content. However, this approach does not provide information on the phasing, number of occurrences of the maxima, and duration. This paper uses the Short Time Response Spectrum (STRS) methodology to evaluate ground motion time history characteristics and their implications to engineering analyses. The STRS provides a Time-Period-Intensity representation of structural response to ground motions and compatible measures of earthquake duration. Thus, the STRS captures not only the maximum amplitude and frequency content of the earthquake motion but also its time evolution.