Measurement for the reduction of seismic risk – Innovative approach to evaluate local site effects and the destru7ctive potential of earthquake ground motion

 

Recent earthquakes (Mexico 1985, Loma Prieta 1989, Northridge 1994, Kobe 1995, etc.) have shown that geotechnical site characteristics can affect very significantly the ground motion shaking and consequently the structure damage.

 

Recent earthquakes (Mexico 1985, Loma Prieta 1989, Northridge 1994, Kobe 1995, etc.) have shown that geotechnical site characteristics can affect very significantly the ground motion shaking and consequently the structure damage.

In this paper the recent Italian Umbria—Marche 1997—l998 seismic sequence is reviewed to analyse the site effects and particularly the soil amplification and the destructive potential indexes, such as the parameter a0, i. e. the number of zero crossing for unit of time, the ratio PGA/PGV, the parameter tD, i. e. the effective duration of the earthquake, the parameter Tm, i. e. the predominant period of the different soil types, the parameter Ar, i. e. the normalised relative amplification.

Several acceleration time histories, recorded at sites with different soil conditions and different distances from the source, are selected and analysed for the evaluation of the site amplification and the destructive potential of earthquake motion.

The strong motion records are grouped referring to three soil types: rock and firm soil, medium stiff soil and soft soil.

Finally, the comparison between tirm soil and soft soil response spectra are evaluated in terms of spectral acceleration (Sa), spectral pseudo-velocity (SPV) and input energy (EI).


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AUTORI: Decanini L.D., Maugeri M., Mollaioli F.
RIG ANNO:2000 NUMERO:4
Numero di pagine: 142


Allegato: https://associazionegeotecnica.it/wp-content/uploads/2010/03/RIG_2001_4_142.pdf
Allegato:
Articolo completo: https://associazionegeotecnica.it/wp-content/uploads/2010/03/RIG_2001_4_142.pdf