Evaluating nonlinear effective stress site response analyses using records from the Canterbury earthquake sequence |
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| Institution: | 1. Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA, USA;2. Department of Civil and Natural Resources Engineering, University of Canterbury, Christchurch, New Zealand;3. Department of Civil and Environmental Engineering, University of Auckland, Auckland, New Zealand;1. Aristotle University of Thessaloniki, P.O.B. 424, 54124 Thessaloniki, Greece;2. Institute of Engineering Seismology and Earthquake Engineering EPPO-ITSAK, 55535 Eleones-Pylaia, Thessaloniki, Greece;1. Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China;2. Kentucky Geological Survey, University of Kentucky, Lexington, KY 40506, USA;3. Department of Earth and Environmental Sciences, University of Kentucky, Lexington, KY 40506, USA;4. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China;5. Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China;1. Swiss Seismological Service, ETH Zürich, Switzerland;2. Global Earthquake Model (GEM), Pavia, Italy;3. University of Liverpool, United Kingdom |
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| Abstract: | A widely used one-dimensional nonlinear effective stress site response analysis program is used to model the response of potentially liquefiable soils during strong shaking. Ground motion records from six events of the 2010–2011 Canterbury earthquake sequence and the extensive site investigation data that have been obtained for the Christchurch area provide the basis for the analyses. The results of the analyses depend significantly on the input motions and soil profile characterization, so these important aspects are examined. Deconvolved Riccarton Gravel input motions were generated, because recorded rock or firm layer motions were not available. Nonlinear effective stress seismic site response analyses are shown to capture key aspects of the observed soil response through the comparison of acceleration response spectra of calculated surface motions to those of recorded surface motions; however, equivalent-linear and total stress nonlinear analyses capture these aspects as well. Biases in the computed motions compared to recorded motions were realized for some cases but they can be attributed primarily to the uncertainty in the development of the input motions used in the analyses. |
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| Keywords: | Effective stress analyses Ground motions Liquefaction Nonlinear analyses Seismic site response |
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