In day-to-day geotechnical seismic analysis is common practice to generate the seismic forces based on smooth-elastic response spectra, although this perspective has demonstrated full utility, it can present some limitations under some scenarios; nevertheless, to optimize the numerical hypothesis and improve the final design, today is highly recommended the use of empirical Time-Histories (TH) to execute step-to-step analysis that includes the possibility to reproduce the non-linear behavior of soils and structures. Spectral matching procedure is adequate to properly define the seismic-environment of a particular site via TH compatibles with a target response spectrum with the advantage of reducing the employed number of TH; thus, the adjusted TH generation also named synthetic seismogram, born due the necessity to create one or more movements with characteristics (e.g. amplitude, frequency content and duration) similar and consistent with the hazard level of the analyzed site (e.g. design spectrum). In this work, some accessible procedures related to TH pre-processing are explained as well as some parametric analysis oriented to the generation of synthetic TH through the RspMatch program v.2009 , finally the paper concludes with critics and general conclusions for its practical application in the geotechnical practice.
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