000011423 001__ 11423
000011423 005__ 20141205155909.0
000011423 04107 $$aeng
000011423 046__ $$k2008-10-12
000011423 100__ $$aRégnier，J.,
000011423 24500 $$aVariability of One-Dimensional Soil Amplification Estimates at Four Sites of the French Permanent Accelerometer Network (RAP)

000011423 24630 $$n14.$$pProceedings of the 14th World Conference on Earthquake Engineering
000011423 260__ $$b
000011423 506__ $$arestricted
000011423 520__ $$2eng$$aIn this study, we compute site amplification estimates and response spectral ratios for different acceleration time histories scaled to different PGA’s by propagating them through 1D soil models with stochastic variation of their mechanical properties. We use three models of wave propagation: the widely known equivalent linear model (EQL) (Schnabel et al., 1972), the frequency-dependent equivalent linear model (AKEQL) (Kausel and Assimaki, 2002), and the elastoplastic nonlinear model (NL) developed by Iwan (1967). We have selected four sites from the French permanent accelerometer network (RAP) deployed in the city of Nice, which is characterized by local strong site amplification due to alluvial filling. A sensitivity study on the numerical methods shows that purely nonlinear analysis greatly depends on the input motion whatever the rock input PGA (PGAr) is; whereas equivalent linear analyses have less dependency with respect to PGAr. We present then the variability of amplification estimates among the wave propagation models. We found that frequency-dependent equivalent linear results are close to those from the traditional equivalent linear model for PGA’s larger than 0.7g. Conversely, for intermediate PGAr values, the first model de-amplifies the high frequencies much lower than the second one. Furthermore, the standard deviation of amplification estimates increases as PGA and frequency increase regardless of the utilized wave propagation model. Using the previous results, the response spectral ratio as a function of PGAr has been computed and inserted in simplified site-specific probabilistic seismic hazard assessment (Cramer, 2003). Finally, a comparison with experimental data shows that 1D modeling is a first order approximation of site effects in Nice.

000011423 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000011423 653__ $$aSoil variability, wave propagation, nonlinear site amplification, Nice.

000011423 7112_ $$a14th World Conference on Earthquake Engineering$$cBejing (CN)$$d2008-10-12 / 2008-10-17$$gWCEE15
000011423 720__ $$aRégnier，J.,$$iBonilla，F.,$$iBertrand，E.,$$iDuval，A.M.,$$iBeauval，C.,$$iScotti，O.,$$iDouglas, J.$$iGhel，P.,
000011423 8560_ $$ffischerc@itam.cas.cz
000011423 8564_ $$s1781647$$uhttps://invenio.itam.cas.cz/record/11423/files/07-0043.pdf$$yOriginal version of the author's contribution as presented on CD, Paper ID: 07-0043.
000011423 962__ $$r9324
000011423 980__ $$aPAPER