Reliability of shallow foundations subjected to multidirectional seismic loading

Show simple item record Larkin, Thomas en 2012-04-18T02:51:06Z en 2006 en
dc.identifier.citation Journal of Geotechnical and Geoenvironmental Engineering 132(6):685-693 2006 en
dc.identifier.issn 1090-0241 en
dc.identifier.uri en
dc.description.abstract A method of assessing the probability of failure of shallow foundations in saturated fine-grained soil under multidirectional seismic loading is presented. The method uses the distributions of two variables, the spectral acceleration at the fundamental period of the structure and the shear strength of the foundation soil, to form the joint probability density function. The performance function, which defines the required soil strength for the foundation to equilibrate the applied loading, is mapped on this domain. Numerical integration is used to ascertain the probability of failure. A bounded probability density function is used, namely a Pearson Type 1 (Beta) distribution, for soil strength. This distribution provides an upper and lower limit to in situ shear strength. The spectral acceleration is represented by the complementary cumulative distribution function of a Type 1 asymptotic extreme value (Gumble) distribution. Such a distribution is shown to be an accurate representation of real earthquake loading and may be found by a probabilistic seismic hazard analysis for a region. The method is based on pseudostatic seismic loading of the foundation and accounts for spectral acceleration acting along the two horizontal axes. The influence of the orientation of the foundation to the earthquake source is incorporated using the concept of principal directions of ground motion. The performance function is formulated for shallow foundations under eccentric and inclined loading using the recommendations in Eurocode 7. The function is shown to be nonlinear and compound, one part pertaining to the bearing mode of failure (for lower values of acceleration) and the remaining part pertaining to the sliding mode of failure (for higher values of acceleration). An equation is presented for the transition acceleration that separates the performance function into the two parts. A case study is presented and conclusions are drawn about the role of the bearing and sliding modes of failure. en
dc.publisher American Society of Civil Engineers en
dc.relation.ispartofseries Journal of Geotechnical and Geoenvironmental Engineering en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. Details obtained from en
dc.rights.uri en
dc.title Reliability of shallow foundations subjected to multidirectional seismic loading en
dc.type Journal Article en
dc.identifier.doi 10.1061/(ASCE)1090-0241(2006)132:6(685) en
pubs.issue 6 en
pubs.begin-page 685 en
pubs.volume 132 en
dc.rights.holder Copyright: American Society of Civil Engineers en
pubs.end-page 693 en
dc.rights.accessrights en
pubs.subtype Article en
pubs.elements-id 74682 en Engineering en Civil and Environmental Eng en
pubs.record-created-at-source-date 2010-09-01 en

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