{"id":52707,"date":"2025-12-02T09:55:01","date_gmt":"2025-12-02T14:55:01","guid":{"rendered":"https:\/\/www.uqac.ca\/uqactualites\/?p=52707"},"modified":"2025-12-02T09:55:35","modified_gmt":"2025-12-02T14:55:35","slug":"a-s-m-fahad-hossain-etudiant-au-doctorat-en-ingenierie-soutient-sa-these","status":"publish","type":"post","link":"https:\/\/www.uqac.ca\/uqactualites\/2025\/12\/02\/a-s-m-fahad-hossain-etudiant-au-doctorat-en-ingenierie-soutient-sa-these\/","title":{"rendered":"A S M Fahad Hossain, \u00e9tudiant au doctorat en ing\u00e9nierie, soutient sa th\u00e8se"},"content":{"rendered":"<p>Finissant au <a href=\"https:\/\/sae.uqac.ca\/bourses-detudes\/\">doctorat en ing\u00e9nierie<\/a>, A S M Fahad Hossain a effectu\u00e9 sa soutenance de th\u00e8se le 1<sup>er<\/sup> d\u00e9cembre 2025. Sous la direction de recherche d&rsquo;<a href=\"https:\/\/portfolio.uqac.ca\/alisaeidi\/\" target=\"_blank\" rel=\"noopener\">Ali Saeidi<\/a> (UQAC) et la codirection de Miroslav Nastev (Commission g\u00e9ologique du Canada), sa th\u00e8se a pour titre \u00ab <em>Seismic Microzonation Mapping Based on Nonlinear Site Response Analysis : Methodology Development and Application to Saguenay, Qu\u00e9bec<\/em> \u00bb.<\/p>\n<p>Sous la pr\u00e9sidence de <a href=\"https:\/\/portfolio.uqac.ca\/mathieufiset\/\" target=\"_blank\" rel=\"noopener\">Mathieu Fiset<\/a> (UQAC), le jury d&rsquo;\u00e9valuation \u00e9tait compos\u00e9 de Jamal Assaf (AtkinsR\u00e9alis) et de Ripon Hore (Louisiana Department of Transportation &amp; Development).<\/p>\n<hr \/>\n<h5>R\u00e9sum\u00e9 de la th\u00e8se<\/h5>\n<p>La compr\u00e9hension des effets de site locaux constitue un \u00e9l\u00e9ment fondamental pour une \u00e9valuation pr\u00e9cise de l\u2019al\u00e9a sismique en surface, notamment dans les r\u00e9gions pr\u00e9sentant des conditions de subsurface complexes. Cette recherche porte sur la r\u00e9gion du Saguenay, situ\u00e9e dans l\u2019Est du Canada, o\u00f9 la g\u00e9ologie de surface se caract\u00e9rise par une forte h\u00e9t\u00e9rog\u00e9n\u00e9it\u00e9. Dans ce contexte, les sch\u00e9mas de classification sismique actuellement en vigueur ne permettent pas toujours de repr\u00e9senter de mani\u00e8re satisfaisante le comportement dynamique des sols.<\/p>\n<details>\n<summary><strong>Voir plus<\/strong><\/summary>\n<p>\u00c0 travers une \u00e9tude int\u00e9gr\u00e9e combinant des approches analytiques, num\u00e9riques et empiriques, cette th\u00e8se propose un cadre m\u00e9thodologique pour une microzonation sismique plus fine. Elle vise \u00e0 identifier et \u00e0 \u00e9valuer l\u2019influence des param\u00e8tres g\u00e9ologiques et g\u00e9otechniques dans le but d\u2019am\u00e9liorer la pr\u00e9vision de l\u2019amplification sismique li\u00e9e aux effets de site.<\/p>\n<p>L\u2019analyse d\u00e9bute par une mod\u00e9lisation unidimensionnelle non lin\u00e9aire de la r\u00e9ponse sismique de 50 profils g\u00e9otechniques, en int\u00e9grant \u00e0 la fois des enregistrements r\u00e9els et des signaux synth\u00e9tiques mis \u00e0 l\u2019\u00e9chelle en fonction de diff\u00e9rents niveaux d\u2019al\u00e9a d\u00e9finis dans le Code national du b\u00e2timent du Canada 2020 (CNB 2020). Les r\u00e9sultats r\u00e9v\u00e8lent que certains param\u00e8tres, tels que la vitesse des ondes de cisaillement, l\u2019\u00e9paisseur totale des d\u00e9p\u00f4ts meubles, ainsi que la pr\u00e9sence d\u2019une couche de till \u00e0 l\u2019interface avec le substratum rocheux, ont une influence significative sur l\u2019amplification de site \u2014 particuli\u00e8rement sous des sollicitations fortes, o\u00f9 le comportement non lin\u00e9aire des sols devient pr\u00e9dominant. Les p\u00e9riodes fondamentales ont \u00e9t\u00e9 estim\u00e9es \u00e0 l\u2019aide des m\u00e9thodes de la couche \u00e9quivalente et des couches multiples. Une p\u00e9riode de site non lin\u00e9aire a \u00e9t\u00e9 introduite comme nouveau param\u00e8tre repr\u00e9sentatif (proxy) dans les mod\u00e8les empiriques d\u2019amplification, sp\u00e9cifiquement adapt\u00e9s aux conditions non lin\u00e9aires induites par des mouvements sismiques intenses.<\/p>\n<p>\u00c0 partir de la combinaison de sept param\u00e8tres potentiels, plusieurs mod\u00e8les empiriques ont \u00e9t\u00e9 \u00e9labor\u00e9s, parmi lesquels le mod\u00e8le optimal int\u00e8gre les variables Vs30, Vsavg, TNL et Htill. Ce mod\u00e8le, combin\u00e9 aux donn\u00e9es issues d\u2019\u00e9tudes ant\u00e9rieures de microzonation, a permis de r\u00e9aliser une microzonation sismique de niveau III pour la r\u00e9gion du Saguenay.<\/p>\n<\/details>\n<hr \/>\n<p>F\u00e9licitations \u00e0 A S M Fahad Hossain pour la soutenance de sa th\u00e8se de doctorat!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Finissant au doctorat en ing\u00e9nierie, A S M Fahad Hossain a effectu\u00e9 sa soutenance de th\u00e8se le 1er d\u00e9cembre 2025. Sous la direction de recherche d&rsquo;Ali Saeidi (UQAC) et la codirection de Miroslav Nastev (Commission g\u00e9ologique du Canada), sa th\u00e8se a pour titre \u00ab Seismic Microzonation Mapping Based on Nonlinear Site Response Analysis : Methodology [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":52709,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2,2844,248],"tags":[666,21,247,293],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\r\n<title>A S M Fahad Hossain, \u00e9tudiant au doctorat en ing\u00e9nierie, soutient sa th\u00e8se - UQACtualit\u00e9s<\/title>\r\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\r\n<link rel=\"canonical\" href=\"https:\/\/www.uqac.ca\/uqactualites\/2025\/12\/02\/a-s-m-fahad-hossain-etudiant-au-doctorat-en-ingenierie-soutient-sa-these\/\" \/>\r\n<meta property=\"og:locale\" content=\"fr_CA\" \/>\r\n<meta property=\"og:type\" content=\"article\" \/>\r\n<meta property=\"og:title\" content=\"A S M Fahad Hossain, \u00e9tudiant au doctorat en ing\u00e9nierie, soutient sa th\u00e8se - UQACtualit\u00e9s\" \/>\r\n<meta property=\"og:description\" content=\"Finissant au doctorat en ing\u00e9nierie, A S M Fahad Hossain a effectu\u00e9 sa soutenance de th\u00e8se le 1er d\u00e9cembre 2025. 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