000019444 001__ 19444
000019444 005__ 20170118182318.0
000019444 04107 $$aeng
000019444 046__ $$k2017-01-09
000019444 100__ $$aRupakhety, Rajesh
000019444 24500 $$aEffects of Layered Stochastic Soil Profile on the Coherency Functions of Spatially Variable Seismic Ground Motions: Case Study Nw Algeria

000019444 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000019444 260__ $$b
000019444 506__ $$arestricted
000019444 520__ $$2eng$$aSeismic design of common engineering structures is based on the assumption that excitations at all support points are uniform or fully coherent. However, in lifeline structures with dimensions of the order of wavelengths of incident seismic waves, spatial variation of seismic ground motions caused by incoherence effects and stochasticity in the characteristics of the surface layers may introduce significant additional forces in their structural elements. The main objective of this paper is to provide estimates of coherency functions of spatially variable ground motion at the free surface of a layered stochastic soil sites in the epicentral region of the El-Asnam Earthquake in Algeria. Lagged coherency functions at bedrock have been estimated in [1] by simulating ground motion field (around Sogedia Factory) corresponding to the 1980 El-Asnam Earthquake. Considering randomness in the thickness of soil layers overlying the bedrock in the study area, an analytical approach proposed by Zerva and Harada [2] is used to evaluate lagged coherency functions at the surface. Soil proprieties are assumed to vary laterally with a Gaussian distribution. Contribution of various factors such as damping ratio of the soil, soil predominant frequency and its spatial variation, and wave propagation velocity on lagged coherency in the surface are investigated. Numerical results indicate that spatial coherence of surface motion is similar to that of bedrock motion, except at the predominant frequency of the site, where a sharp decrease in lagged coherency is observed. It is also observed that, even for firm soil conditions, later homogeneity of site can significantly affect lagged coherency of motion at ground surface.

000019444 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000019444 653__ $$aCoherency function; spatial variability; seismic ground motion; random soil

000019444 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000019444 720__ $$aRupakhety, Rajesh$$iHammoutene, Malek$$iTiliouine, Boualem$$iAfifchaouch, Karim$$iÓlafsson, Símon
000019444 8560_ $$ffischerc@itam.cas.cz
000019444 8564_ $$s255544$$uhttps://invenio.itam.cas.cz/record/19444/files/3633.pdf$$yOriginal version of the author's contribution as presented on USB, paper 3633.
000019444 962__ $$r16048
000019444 980__ $$aPAPER