Analytical and numerical investigation of site response due to vertical ground motion

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Title: Analytical and numerical investigation of site response due to vertical ground motion
Author(s): Han, BO
Zdravkovic, L
Kontoe, S
Item Type: Journal Article
Abstract: Due to the repeatedly observed strong vertical ground motions and compressional damage of engineering structures in recent earthquakes, the multi - directional site response analysis is increasingly critical for the seismic design of important st ructures, such as nuclear power plants and high earth dams. However, the site response to the vertical component of the ground motion has not be en the subject of detailed investigation in the literature . Therefore, i n this paper, the vertical site response due to vertical ground motion is investigated by employing both analytical and numerical methods. Firstly, a 1 - D frequency domain analytical solution , which can be employed for vertical site response analysis in practice, is studied and compared against t ime domain Finite Element ( FE ) analyses for the two extreme soil state conditions (i.e. undrained and drained conditions). The vertical site response is further investigated with hydro - mechanical ly (HM) coupled FE analysis, considering solid - fluid interact ion. The undertaken parametric studies show that the predicted vertical site response is strongly affected by the parameters characterising the hydraulic phase, i.e. soil permeability and soil state conditions, both in terms of frequency content and amplif ication. T he subsequent corresponding quantitative investigati on , of the frequency content and amplification function of the vertical site response, shows that depending on the soil permeabilit y the response is dominated by the two types of compressional w aves (fast and slow wave). Notably, the parametric studies identify a range of permeability that significantly affect s dynamic soil properties in terms of P - wave velocities , damping ratios and vertical site response, and this range is relevant for geotechn ical earthquake engineering applications . It is therefore recommended that coupled consolidation analysis is necessary to accurately simulate this effect at such permeability - dependent intermediate transient state s between fully undrained and drained condi tions . Finally, this work suggests a simple modification of standard total - stress site response analysis to account for vertical ground motion and solid - pore fluid interaction. In order to simulate the attenuation of the response due to solid - pore fluid in teraction effects, it is suggested to employ additional HM viscous damping in total - stress analysis, further to the one used to account for hysteretic material damping. This additional viscous damping can be quantified based on the empirical curves propose d in the paper.
Publication Date: 9-May-2018
Date of Acceptance: 18-May-2017
URI: http://hdl.handle.net/10044/1/48613
DOI: https://dx.doi.org/10.1680/jgeot.15.P.191
ISSN: 1021-8637
Publisher: Thomas Telford (ICE Publishing)
Start Page: 467
End Page: 480
Journal / Book Title: Geotechnique
Volume: 68
Issue: 6
Copyright Statement: © ICE Publishing, all rights reserved
Keywords: 0905 Civil Engineering
Geological & Geomatics Engineering
Publication Status: Published
Online Publication Date: 2017-10-02
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering
Geotechnics



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