Ground motion amplification for canyon topographies with different input motions

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Title: Ground motion amplification for canyon topographies with different input motions
Authors: Skiada, E
Kontoe, S
Stafford, P
Potts, D
Item Type: Conference Paper
Abstract: It is widely known that topographic irregularities influence the surface ground motions, typically with a n enhancement of the response close to convex topographic features , such as ridges and slope crests. Several studies have in vestigat ed the ground motion at the surface of filled valleys and empty canyons, focus ing mainly on the geometry and the soil characteristics rather than the input excitation. F urther investigation of th e impact of the input excitation to the ground surface response is needed in order to modify existing ground motion prediction models to account for topographic effects. The response of canyons has been previously examined; but mainly focusing on simple wa velet input . This paper considers a fully weathered canyon (i.e., without any in - fill material) aiming to investigate the influence of the input excitation on the surface ground motion through a parametric time - domain finite element (FE) study. A two - dimen sional plane - strain model of an idealised canyon is considered for vertically propagating SV waves, using both wavelets and recorded earthquakes 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. Topographic aggravation is presented for several points along the canyon ground surface aiming to derive a pattern of its distribution considering input excitation with different characteristics.
Issue Date: 16-Jul-2017
Date of Acceptance: 26-Apr-2017
URI: http://hdl.handle.net/10044/1/48623
Publisher: ISSMGE
Copyright Statement: © 2017 The Authors
Sponsor/Funder: Geotechnical Consulting Group
Funder's Grant Number: GCG Chair
Conference Name: 3rd International Conference on Performance-based Design in Earthquake Geotechnical Engineering (PBD-III)
Publication Status: Accepted
Start Date: 2017-07-16
Finish Date: 2017-07-19
Conference Place: Vancouver, Canada
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering



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