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Site-Specific Seismic Nonlinear Ground Analysis on Sample Soil Profiles in Eastern Canada

Zi Jing Zhang

Masters thesis (2021)

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Cite this document: Zhang, Z. J. (2021). Site-Specific Seismic Nonlinear Ground Analysis on Sample Soil Profiles in Eastern Canada (Masters thesis, Polytechnique Montréal). Retrieved from https://publications.polymtl.ca/6329/
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Abstract

«RÉSUMÉ: Parmi les pratiques actuelles de l'industrie dans l'est du Canada, les facteurs d'amplification trouvés dans le Code national du bâtiment de 2015 (NBCC 2015) sont couramment utilisés pour déterminer l'amplification des ondes sismiques à travers un dépôt de sol mou en cas de tremblement de terre. Lorsqu'une analyse spécifique au site est requise, l'analyse équivalente linéaire est couramment utilisée. Cette dernière est une procédure itérative qui consiste à réaliser des simulations linéaires avec des propriétés de sols constantes, prises d’un ensemble de courbes de réduction du module de cisaillement et d’amortissement à un niveau de déformation donné, jusqu’à ce que le niveau de déformation obtenu dans l’analyse corresponde au niveau des données d’entrée. En revanche, l’analyse non-linéaire de la propagation des ondes sismiques est une approche plus robuste et plus fiable, capable de représenter les variations des propriétés dynamiques durant l’analyse, mais elle est présentement rarement utilisée dans l'est du Canada à cause sa complexité.» et «----------ABSTRACT: Among current industry practices in Eastern Canada, amplification factors found in the National Building Code of Canada 2015 (NBCC 2015) are commonly used to determine the amplification of seismic waves in a soft soil deposit in the event of an earthquake. When a site-specific analysis is warranted, the equivalent linear ground response analysis has been commonly used. The latter is an iterative procedure that consists of performing linear analysis with constant dynamic soil properties, that are picked from a set of modulus reduction and damping curve at a given shear strain level, until the strains from the analysis are consistent with the input values. On the other hand, the nonlinear ground response analysis is a more robust and reliable approach, able to represent the variations of dynamic properties during the analysis, but it is currently seldomly used in Eastern Canada due to its complexity. This research project first aims to create a MATLAB code to facilitate the use of DEEPSOIL, a well-established nonlinear analysis computer software, based on available geotechnical data. Based on available CPT, vane shear and shear wave velocity data, the MATLAB code automatically generates a table of soil layers with corresponding basic geotechnical properties and dynamic soil properties, such as the modulus reduction (corrected for the shear strength) and damping curves, which can then be directly imported into DEEPSOIL in order to greatly reduce the time required for the definition of soil layers.»

Open Access document in PolyPublie
Department: Département des génies civil, géologique et des mines
Academic/Research Directors: Samuel Yniesta and Alain Plaisant
Date Deposited: 14 Jul 2021 12:06
Last Modified: 14 Jul 2021 12:06
PolyPublie URL: https://publications.polymtl.ca/6329/

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