Geometric- and non-geometric mean sensor-orientation-independent seismic intensities: application to the Italian strong motion database
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Tipus de documentText en actes de congrés
Data publicació2018
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ProjecteNUEVAS AVANCES DE LA GEOFISICA Y LA INGENIERIA APLICADOS A LA EVALUACION DEL RIESGO SISMICO (MICINN-CGL2011-23621)
DESARROLLO Y APLICACION DE HERRAMIENTAS AVANZADAS PARA LA EVALUACION, PREVENCION Y GESTION DEL RIESGO SISMICO (MINECO-CGL2015-65913-P)
DESARROLLO Y APLICACION DE HERRAMIENTAS AVANZADAS PARA LA EVALUACION, PREVENCION Y GESTION DEL RIESGO SISMICO (MINECO-CGL2015-65913-P)
Abstract
In this paper, the directionality effects of the as recoded ground motions are investigated. The Italian accelerometric archive (ITACA) is used for this purpose. A number of 949 horizontal ground motion records (two components) are used. The following measures, resulting from different ways of combining the maximum values (m1,m2) of the two horizontal components were investigated: Geometric Mean (GMRot), projection (Rot) of the two as recorded components onto all non-redundant azimuths and larger (LRot) value [max(m1,m2)]. The sensor-orientation-independent quantities: GMRotDpp, RotDpp, GMRotIpp and LRotDpp have been obtained. In these quantities, pp means percentile and D and I, respectively, mean dependent and independent of the period. The 50th percentiles values of these intensity measures were compared to the GM of the as-recorded components obtaining differences of 1% for GMRotD50 and in the ranges 2-6%, 1-2% and 15-27% respectively for RotD50, GMRotI50 and LRotD50. The three first ratios show a good agreement with similar studies in other regions. Moreover, the vector combination of the two orthogonal time histories (Root of the Sum of Squares, RSS) presents equal values as RotD100 and LRotD100. The study has also been performed by using the maxima of the time histories combinations; the following quantities are thus investigated: mGMRotDpp and mGMRotIpp, where m indicates peak values of the combined time histories. Our results indicate that the ratios between the 50th percentile of these orientation independent intensities and the GM of the as-recorded components, are in the ranges 0.78-0.85 and 0.79-0.86, respectively, proving that former ones are conservative.
CitacióPinzon, L.; Pujades, L.G.; Hidalgo, D.A. Geometric- and non-geometric mean sensor-orientation-independent seismic intensities: application to the Italian strong motion database. A: European Conference on Earthquake Engineering. "16th European Conference on Earthquake Engineering: conference proceedings". 2018, p. 1-12.
Versió de l'editorhttps://papers.16ecee.org/files/paper%2016ecee%20lpu.pdf
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