Empirical Dynamic Amplification Factors for Sites Based on Seismic Noise


Abstract eng:
Seismic demand determination for structures and quantification of seismic hazard of a region require the evaluation of the local site effects, such as the dynamic amplification of the soil. Commonly, there are two parameters that the most modern models and seismic codes use independently to quantify this phenomenon. One is the fundamental period of the soil or To (Japanese code) and the second is the average shear wave velocity up to 30 m depth or V S30 (North American and European codes). However, none of these two parameters has managed to explain acceleration records in large Chilean earthquakes, such as the records in the Concepción city during the 2010 Mw 8.8 Maule Earthquake. In this paper, an empirical model to quantify the dynamic amplification of soil at periods from 0.01 s to 10 s, using the 5% damped H/V response spectral ratios (HVRSR) obtained from earthquake acceleration records at seismic stations located in Chile, is developed. The amplification factor is expressed in terms of the soil predominant period (T*) and the peak value of the average HVRSR of the site. The predominant soil period allows to describe the spectral shape factor, while the peak value of the HVRSR determines its amplitude, which make the proposed model unprecedented. The results can be used to assess the seismic hazard in a variety of sites and to derive ground motion prediction equations for the Chilean region or other region with similar seismological and geological characteristics. In addition, the results could allow projecting future changes in the determination of the seismic demand on the official Chilean Earthquake Resistant Design code (NCh433).

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 2898.:
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