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Comparison of code-oriented site classification in the Saguenay region, Québec

Salsabili Mohammad, Saeidi Ali et Rouleau Alain. (2019). Comparison of code-oriented site classification in the Saguenay region, Québec. Dans : 12th Canadian Conference on Earthquake Engineering , June 17-20, 2019, Québec, Québec.

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Résumé

Local geological and geotechnical conditions can have significant effects on the incoming seismic waves and their spatial variation. Commonly referred to as site-effects, certain conditions can significantly amplify the intensity of the seismic shaking and make it more destructive. Site effects are accounted for in national building codes by the selection of amplification factors as functions of soil category, seismic intensity and frequency. The soil type is categorized by considering representative shearwave velocity, the number of blows in the standard penetration test, and/or undrained shear strength in the top 30 meters. Although soil categorizations based on these geotechnical parameters are more or less similar across earthquake-prone countries, there are some differences, which may result in over- or underestimation of the potential site effects. The SaguenayLac-Saint-Jean region (SLSJ) is located in a moderate seismicity zone in Eastern Canada; the last major earthquake in this region occurred in 1988 with a moment magnitude of 5.9. The presence of important deposits of sensitive clays in SLSJ combined with the strong impedance contrast between the unconsolidated deposits and the underlying crystalline bedrock can play an important role in the soil dynamic response. Different soil classification criteria and respective amplification factors are compared: the 2015 National Earthquake Hazards Reduction Program (NEHRP), Eurocode 8, and the 2015 National Building Code of Canada (NBCC). The advantages and disadvantages of each classification approach are discussed.

Type de document:Matériel de conférence (Non spécifié)
Date:17 Juin 2019
Sujets:Sciences naturelles et génie > Génie
Sciences naturelles et génie > Sciences appliquées
Sciences naturelles et génie > Sciences naturelles > Sciences de la terre (géologie, géographie)
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées > Unité d'enseignement en sciences de la Terre
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Mots-clés:site-effects, National Codes, The Saguenay region, site classification, Vs,30, effets de site, Codes nationaux, région du Saguenay, classification des sites
Déposé le:08 mars 2021 19:07
Dernière modification:08 mars 2021 19:07
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