000011894 001__ 11894
000011894 005__ 20141205155957.0
000011894 04107 $$aeng
000011894 046__ $$k2008-10-12
000011894 100__ $$aTokimatsu, Kohji
000011894 24500 $$aNonlinear Soil Properties Estimated from Downhole Array Recordings at Kashiwazaki-Kariwa Nuclear Power Plant in the Niigata-Ken Chuetsu-Oki Earthquakes

000011894 24630 $$n14.$$pProceedings of the 14th World Conference on Earthquake Engineering
000011894 260__ $$b
000011894 506__ $$arestricted
000011894 520__ $$2eng$$aNonlinear soil properties are back-calculated using strong motion downhole array recordings at the Service Hall of the Kashiwazaki-Kariwa nuclear power plant during the 2007 Niigata-ken Chuetsu-oki earthquakes. A technique used for this inversion is genetic algorithm combined with a one dimensional equivalent linear response analysis in which soil damping ratios vary with Fourier amplitude of shear strain in the frequency domain. The Holocene and Pleistocene dune sands with Vs = 200-350 m/s at depths smaller than about 70 m showed strong nonlinear behavior with shear modulus ratios of about 0.01-0.8 and damping ratios of about 20-35 % at maximum shear stains of about 2x10-3 - 3x10-2 during the main event. The reduction in shear modulus ratio is consistent with previous laboratory test results for sand consolidated under similar confining pressures but the back-calculated damping ratio seems to be higher than that of the previous studies. The mudstone with Vs =500 m/s located at depths greater than about 70 m did not show any strong nonlinearity during the main shock, with shear modulus ratios of about 1.0 and damping ratios of up to 5 % at maximum shear strains up to about 5x10-4 - 2x10-3.

000011894 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000011894 653__ $$aNiigata-ken Chuetsu earthquake, nonlinear site response, shear modulus, damping ratio, back-analysis, genetic algorithm

000011894 7112_ $$a14th World Conference on Earthquake Engineering$$cBejing (CN)$$d2008-10-12 / 2008-10-17$$gWCEE15
000011894 720__ $$aTokimatsu, Kohji$$iArai, H.
000011894 8560_ $$ffischerc@itam.cas.cz
000011894 8564_ $$s991019$$uhttps://invenio.itam.cas.cz/record/11894/files/04-01-0139.pdf$$yOriginal version of the author's contribution as presented on CD, Paper ID: 04-01-0139.
000011894 962__ $$r9324
000011894 980__ $$aPAPER