Pérez-Marcial, Elvin J.

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    Ground response spectra at surface for Mayagüez considering in-situ soil dynamic properties
    (2005) Pérez-Marcial, Elvin J.; Suárez, Luis E.; College of Engineering; Pando, Miguel A.; Martínez Cruzado, José A.; Department of Civil Engineering; Arroyo, Jose R.
    One dimensional ground response analyses was performed at fifteen sites in Mayagüez Puerto Rico to study their seismic response for the development of response spectra at the surface. Field experiments using the Spectral Analysis of Surface Waves (SASW) method were carried out in nine sites for the development of shear wave velocity profiles. To others six sites, the shear wave velocity profiles were constructed by correlating the shear wave velocity and N values from the Standard Penetration Tests obtained from previous studies. The fifteen sites were classified according to the UBC-97 based on the average shear wave velocity (Vs30) obtained for each soil profile. The results were compared with a simplified procedure for estimating Vs30 from SASW data proposed by Brown (2000). Using the SASW data and complementing it with available geotechnical information, equivalent linear analyses were performed by using the computer program SHAKE2000. The ground motions considered were four artificial accelerograms compatible with the UBC-97 design response spectrum for seismic zone 3 in rock. A real acceleration record from the El Salvador earthquake of October 10, 1986 was also considered. For each site, the soil profile fundamental period, peak acceleration, and ground response spectrum at the surface are reported. The UBC-97 design response spectra were compared with the response spectra at the surface obtained in this thesis for each soil profile classification. The sites located in the Añasco Valley and part of the downtown area resulted in relatively higher spectral accelerations than the recommended in the UBC-97 for its soil type. Research needs are identified and suggestions for future works are also presented.