{"id":3466,"date":"2025-07-30T15:52:20","date_gmt":"2025-07-30T14:52:20","guid":{"rendered":"https:\/\/lmc2.univ-lyon1.fr\/?page_id=3466"},"modified":"2025-07-30T15:54:18","modified_gmt":"2025-07-30T14:54:18","slug":"nasser-mohamed","status":"publish","type":"page","link":"https:\/\/lmc2.univ-lyon1.fr\/?page_id=3466","title":{"rendered":"NASSER Mohamed"},"content":{"rendered":"\n<h4>\u00a0<\/h4>\n<h4><span style=\"color: #ff6600;\"><em><strong><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-thumbnail wp-image-3449\" src=\"http:\/\/lmc2.univ-lyon1.fr\/wp-content\/uploads\/2025\/07\/nasser-150x150.png\" alt=\"\" width=\"150\" height=\"150\" \/>Sujet de doctorat\u00a0<\/strong><\/em><\/span><\/h4>\n<p>\u00c9tude exp\u00e9rimentale et num\u00e9rique approfondie des liaisons d\u2019armatures en forme d\u2019olive soumises \u00e0 des<br \/>sollicitations de traction multi-\u00e9chelles et appliqu\u00e9es aux joints sismiques dans les structures en b\u00e9ton arm\u00e9.<\/p>\n<h4><em><strong><span style=\"color: #ff6600;\">R\u00e9sum\u00e9 de la th\u00e8se :\u00a0<\/span><\/strong><\/em><\/h4>\n<p>Cette \u00e9tude pr\u00e9sente un coupleur m\u00e9canique innovant en forme d&rsquo;olive pour am\u00e9liorer les performances structurelles et le comportement sismique des connexions d&rsquo;armatures en b\u00e9ton arm\u00e9. Contrairement aux coupleurs cylindriques traditionnels qui g\u00e9n\u00e8rent des concentrations de contraintes, le profil elliptique optimise la distribution des efforts et facilite l&rsquo;installation dans les configurations d&rsquo;armatures denses. Un traitement de normalisation att\u00e9nue les contraintes r\u00e9siduelles, garantissant des propri\u00e9t\u00e9s m\u00e9caniques sup\u00e9rieures.<\/p>\n<p>La recherche \u00e9tudie la r\u00e9ponse sismique des voiles et poteaux incorporant ces coupleurs via un programme exp\u00e9rimental complet : essais de traction, traction dynamique haute vitesse et chargements cycliques. Les r\u00e9sultats confirment que les sp\u00e9cimens normalis\u00e9s pr\u00e9sentent une r\u00e9sistance et rigidit\u00e9 sup\u00e9rieures, avec rupture dans l&rsquo;armature plut\u00f4t que dans le coupleur, d\u00e9montrant un transfert de charge efficace. Les essais cycliques r\u00e9v\u00e8lent des am\u00e9liorations significatives de la ductilit\u00e9, dissipation d&rsquo;\u00e9nergie, rigidit\u00e9 s\u00e9cante et capacit\u00e9 d&rsquo;auto-centrage.<\/p>\n<p>Les coupleurs m\u00e9caniques constituent une alternative efficace aux recouvrements traditionnels, r\u00e9duisant la congestion d&rsquo;armatures et am\u00e9liorant la qualit\u00e9 de construction, particuli\u00e8rement avantageux pour les \u00e9l\u00e9ments pr\u00e9fabriqu\u00e9s.<\/p>\n<p>L&rsquo;approche exp\u00e9rimentale multi-\u00e9tapes a \u00e9valu\u00e9 diverses configurations, compl\u00e9t\u00e9e par des simulations num\u00e9riques analysant la r\u00e9ponse structurelle globale. Les r\u00e9sultats exp\u00e9rimentaux et num\u00e9riques confirment que ces coupleurs am\u00e9liorent les performances structurelles par une meilleure ductilit\u00e9, dissipation d&rsquo;\u00e9nergie et r\u00e9sistance \u00e0 la d\u00e9gradation.<\/p>\n<p>Ces coupleurs s&rsquo;\u00e9tablissent comme alternative sup\u00e9rieure aux m\u00e9thodes conventionnelles, offrant fiabilit\u00e9 et comportement sismique accrues pour les structures en b\u00e9ton arm\u00e9 \u00e0 grande \u00e9chelle.<\/p>\n<h4><span style=\"color: #ff6600;\"><em><strong>Encadrants<\/strong><\/em><\/span><\/h4>\n<ul>\n<li class=\"bulletBlanc\">Direction de th\u00e8se :\u00a0<b>Emmanuel FERRIER<\/b><\/li>\n<li class=\"bulletBlanc\">Codirecteur de th\u00e8se :\u00a0<b>Aron GABOR<\/b>\u00a0<\/li>\n<li class=\"bulletBlanc\">Co-encadrant :\u00a0<b>Laurent MICHEL<\/b>\u00a0<\/li>\n<\/ul>\n<p>La th\u00e8se a \u00e9t\u00e9 financ\u00e9 dans le cadre du projet <a href=\"https:\/\/lmc2.univ-lyon1.fr\/?page_id=3241\">RAFAL.<\/a><\/p>\n<p>\u00a0<\/p>\n\n\n","protected":false},"excerpt":{"rendered":"<p>\u00a0 Sujet de doctorat\u00a0 \u00c9tude exp\u00e9rimentale et num\u00e9rique approfondie des liaisons d\u2019armatures en forme d\u2019olive [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-3466","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/lmc2.univ-lyon1.fr\/index.php?rest_route=\/wp\/v2\/pages\/3466","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lmc2.univ-lyon1.fr\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/lmc2.univ-lyon1.fr\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/lmc2.univ-lyon1.fr\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lmc2.univ-lyon1.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3466"}],"version-history":[{"count":2,"href":"https:\/\/lmc2.univ-lyon1.fr\/index.php?rest_route=\/wp\/v2\/pages\/3466\/revisions"}],"predecessor-version":[{"id":3471,"href":"https:\/\/lmc2.univ-lyon1.fr\/index.php?rest_route=\/wp\/v2\/pages\/3466\/revisions\/3471"}],"wp:attachment":[{"href":"https:\/\/lmc2.univ-lyon1.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3466"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}