000019976 001__ 19976
000019976 005__ 20170118182349.0
000019976 04107 $$aeng
000019976 046__ $$k2017-01-09
000019976 100__ $$aSkiada, Evangelia
000019976 24500 $$aCanyon Topography Effects on Ground Motion

000019976 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000019976 260__ $$b
000019976 506__ $$arestricted
000019976 520__ $$2eng$$aIt is broadly known that topographic irregularities effect ground motions, with a particular enhancement of the ground response close to convex topographic features such as ridges and slope crests. Although there are many studies investigating the ground motion in the vicinity of slope crests, the response at the toe has not been studied in great detail, as the toe ground motion is normally considered to be smaller than that of the crest. However, for canyon topographies further investigation of the ground motion at the slope toe, where a more complicated response is expected due to the interaction of the canyon sides, is needed. The response of semi-circular and semi-elliptical canyons has been previously examined; but mainly focusing on valleys filled with soft materials. This paper considers a fully weathered canyon (i.e., without any in-fill material) aiming to investigate the influence of a canyon’s width on the surface ground motion through a parametric timedomain finite element (FE) study. A two-dimensional plane-strain model of an idealised canyon is considered for vertically propagating SV waves, using wavelets as input excitation. The model consists of two step-like slopes with slope height (H), in a homogeneous linear elastic soil layer overlying rigid bedrock. The analyses focus first on the canyon slope areas, where the ground motion is altered depending upon the proximity to the topographic irregularity, identifying the main parameters that effect the response. Results are also presented for several points along the canyon ground surface showing that the distribution of topographic aggravation varies significantly with canyon width.

000019976 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000019976 653__ $$atopography; 2D wave propagation; amplification; canyon; ground motion

000019976 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000019976 720__ $$aSkiada, Evangelia$$iKontoe, Stavroula$$iStafford, Peter$$iPotts, David
000019976 8560_ $$ffischerc@itam.cas.cz
000019976 8564_ $$s869031$$uhttps://invenio.itam.cas.cz/record/19976/files/4858.pdf$$yOriginal version of the author's contribution as presented on USB, paper 4858.
000019976 962__ $$r16048
000019976 980__ $$aPAPER