PSEUDOACELERATION ELASTIC RESPONSE SPECTRA FROM SOIL LINEAR EQUIVALENT DYNAMIC ANALISYS IN CHIMBOTE – PERÚ ABSTRACT
Published 2017-06-13
Keywords
- elastics response spectrum,
- seismic microzonation,
- seismic zonation,
- earthquake engineering,
- design spectra
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Abstract
Nowadays in the seismic engineering filed several technics and methodologies have been developed with the main goal to estimate or predict the 1D acceleration response spectra of soil, all of them based in the upward propagation of shear waves from the underlying rock formation. For this reason, the principal aim of this research is determine the 1D surface soil response spectral acceleration in Chimbote and Nuevo Chimbote area at the north cost of Perú. For this purpose we use previous results from the “Seismic Zonation” project carried out previously in Chimbote and Nuevo Chimbote. The response spectra computation was performed through a linear equivalent dynamic analysis. For that, were selected 5 ground motion time series from worldwide earthquakes and artificial earthquakes simulated following internationals seismic codes guidelines. From these records, and using variations of Vs30 and sediment thickness from a seismic zoning map, we computed 56 response spectrums for each soil variation. These 56 acceleration response spectra were grouped into Vs30 and thickness ranges and compared with the National Seismic Code criteria and elastic design spectra from international codes for soil in similar conditions. From a qualitative evaluation, the methodology applied shows coherent results; we recommend for the study area 4 new elastic design spectra derived from E.030 recommendations and from the results of this research.
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References
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