000019769 001__ 19769
000019769 005__ 20170118182335.0
000019769 04107 $$aeng
000019769 046__ $$k2017-01-09
000019769 100__ $$aSalloum, Nancy
000019769 24500 $$aEffect of the 2D Spatial Variability of Linear Soil Properties on the Spatial Variability of Surface Ground Motion

000019769 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000019769 260__ $$b
000019769 506__ $$arestricted
000019769 520__ $$2eng$$aSpatial variability of earthquake ground motion (SVEGM) refers to the differences in amplitude and phase between recordings of the same earthquake at different locations. SVEGM can have a significant effect on the dynamic response of large structures with large dimensions, such as dams, nuclear power plants, bridges and lifeline facilities. Usually, SVEGM is attributed to the wave passage, spatial incoherence, and local site effects. In the near-surface, geological process (sedimentation, erosion) and anthropogenic activities can lead to small scale spatial heterogeneities of soil mechanical properties. In order to study the effects of such near-surface heterogeneities on the spatial variability of surface ground motion, a set of numerical experiments are designed based on the spatial variability of soil properties (shear-wave velocities Vs) measured in the alluvial plain of Beirut, Lebanon. The 2D spatially variable Vs are modeled using random field theory and discretized using the EOLE method (Expansion Optimal Linear Estimation). Seismic ground motions were simulated within 1 Hz and 25 Hz using FLAC2D for a plane wave excitation with P-SV polarization. The horizontal autocorrelation distance was taken equal to 5 and 10 m, while the vertical autocorrelation distance was fixed to 2m. The coefficient of variation of Vs was fixed to 20% and 40%. Computed surface time series clearly outline locally diffracted surface waves at the ground heterogeneity, which lead to large spatial variation of the surface ground motion in terms of amplification and duration. The frequency-and spatially dependent ground motion parameters (amplification, PGV, Arias Intensity, Arias Duration) in terms of average values and standard deviations were found to be mainly controlled by the coefficient of variation on Vs and, less significantly, by the horizontal autocorrelation distance of Vs.

000019769 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000019769 653__ $$aSpatial variability; Seismic response; Random field; 2D numerical modeling

000019769 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000019769 720__ $$aSalloum, Nancy$$iLopez-Caballero, Fernando$$iJongmans, Denis$$iBittar, Tamara Al$$iCornou, Cecile$$iHaber, Elias El$$iMassih, Dalia Youssef Abdel
000019769 8560_ $$ffischerc@itam.cas.cz
000019769 8564_ $$s735169$$uhttps://invenio.itam.cas.cz/record/19769/files/4348.pdf$$yOriginal version of the author's contribution as presented on USB, paper 4348.
000019769 962__ $$r16048
000019769 980__ $$aPAPER