{"id":24795,"date":"2026-07-27T09:36:12","date_gmt":"2026-07-27T07:36:12","guid":{"rendered":"https:\/\/incoperfil.com\/guia-tecnica\/18-appuis-du-plancher-collaborant-sur-la-structure\/"},"modified":"2026-09-14T16:41:19","modified_gmt":"2026-09-14T14:41:19","slug":"18-appuis-du-plancher-collaborant-sur-la-structure","status":"publish","type":"guia-tecnica","link":"https:\/\/incoperfil.com\/fr\/guia-tecnica\/18-appuis-du-plancher-collaborant-sur-la-structure\/","title":{"rendered":"18. Appuis du plancher collaborant sur la structure"},"content":{"rendered":"<p data-start=\"556\" data-end=\"866\">La conception et la r\u00e9alisation des appuis du plancher collaborant sont essentielles pour garantir la s\u00e9curit\u00e9 pendant la phase de construction ainsi que la stabilit\u00e9 structurelle de la dalle mixte. Conform\u00e9ment \u00e0 l&rsquo;Eurocode 4, les longueurs minimales d&rsquo;appui doivent \u00eatre respect\u00e9es, tant pour le profil acier que pour la partie en b\u00e9ton.<\/p>\n<h2 data-start=\"868\" data-end=\"890\">Typologie des appuis<\/h2>\n<p data-start=\"892\" data-end=\"1046\">Le plancher collaborant est g\u00e9n\u00e9ralement support\u00e9 par une ossature m\u00e9tallique, mais il peut \u00e9galement \u00eatre pos\u00e9 sur des poutres en b\u00e9ton, des poutres en bois ou des murs porteurs.<\/p>\n<p data-start=\"1048\" data-end=\"1290\">L&rsquo;orientation des poutres secondaires d\u00e9termine celle des appuis principaux, qui doivent \u00eatre dispos\u00e9s perpendiculairement aux nervures du profil. Ces appuis d\u00e9finissent les trav\u00e9es unidirectionnelles prises en compte dans le calcul de la structure.<\/p>\n<p data-start=\"1292\" data-end=\"1639\">Par ailleurs, des appuis longitudinaux continus doivent \u00eatre pr\u00e9vus en p\u00e9riph\u00e9rie du plancher, g\u00e9n\u00e9ralement au moyen de poutres de rive. En l&rsquo;absence d&rsquo;un appui longitudinal continu, il convient de r\u00e9aliser une fermeture dans les nervures d&rsquo;extr\u00e9mit\u00e9, avec une largeur suffisante et un ferraillage adapt\u00e9, tout en maintenant un \u00e9taiement provisoire pendant la phase de construction si n\u00e9cessaire.<\/p>\n<h2 data-start=\"1641\" data-end=\"1668\">Appui transversal minimal<\/h2>\n<p data-start=\"1670\" data-end=\"1763\">La largeur minimale d&rsquo;appui d\u00e9pend du mat\u00e9riau du support et du type d&rsquo;assemblage entre les t\u00f4les. \u00c0 titre indicatif :<\/p>\n<h3 style=\"padding-left: 40px;\" data-start=\"1790\" data-end=\"1837\">Sur des supports en acier ou en b\u00e9ton, avec des t\u00f4les \u00e0 recouvrement :<\/h3>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul data-start=\"1840\" data-end=\"1927\">\n<li data-start=\"1840\" data-end=\"1875\">\n<p data-start=\"1842\" data-end=\"1875\">Appui minimal du profil acier : 50 mm<\/p>\n<\/li>\n<li data-start=\"1878\" data-end=\"1927\">\n<p data-start=\"1880\" data-end=\"1927\">Appui minimal de la section en b\u00e9ton : 75 mm<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3 style=\"padding-left: 40px;\" data-start=\"1931\" data-end=\"1976\">Sur des supports en acier ou en b\u00e9ton, avec des t\u00f4les assembl\u00e9es \u00e0 joints bout \u00e0 bout :<\/h3>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul data-start=\"1979\" data-end=\"2067\">\n<li data-start=\"1979\" data-end=\"2014\">\n<p data-start=\"1981\" data-end=\"2014\">Appui minimal du profil acier : 50 mm<\/p>\n<\/li>\n<li data-start=\"2017\" data-end=\"2067\">\n<p data-start=\"2019\" data-end=\"2067\">Appui minimal de la section en b\u00e9ton : 100 mm<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3 style=\"padding-left: 40px;\" data-start=\"2071\" data-end=\"2119\">Pour les autres mat\u00e9riaux de support (bois ou ma\u00e7onnerie) :<\/h3>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul data-start=\"2122\" data-end=\"2233\">\n<li data-start=\"2122\" data-end=\"2157\">\n<p data-start=\"2124\" data-end=\"2157\">Appui minimal du profil acier : 70 mm<\/p>\n<\/li>\n<li data-start=\"2160\" data-end=\"2233\">\n<p data-start=\"2162\" data-end=\"2233\">Appui minimal de la section en b\u00e9ton : 100 \u00e0 140 mm, selon la configuration de l&rsquo;appui.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p data-start=\"2235\" data-end=\"2334\">Ces valeurs permettent de garantir la stabilit\u00e9 du coffrage pendant la phase de construction ainsi que la bonne transmission des charges.<\/p>\n<p data-start=\"2336\" data-end=\"2470\">En pr\u00e9sence de rives p\u00e9riph\u00e9riques ou de joints d&rsquo;\u00e9tanch\u00e9it\u00e9, il convient de v\u00e9rifier que la longueur d&rsquo;appui effective respecte les dimensions minimales requises.<\/p>\n<h2 data-start=\"2472\" data-end=\"2523\">Comportement pendant la phase de coffrage et en phase mixte<\/h2>\n<p data-start=\"2525\" data-end=\"2714\">Pendant la phase de coffrage, le profil acier joue le r\u00f4le de coffrage perdu provisoire. L&rsquo;appui doit permettre sa fixation m\u00e9canique et emp\u00eacher tout d\u00e9placement accidentel lors du coulage du b\u00e9ton.<\/p>\n<p data-start=\"2716\" data-end=\"2946\">En phase mixte, une fois le b\u00e9ton durci, les r\u00e9actions verticales sont transmises \u00e0 la structure porteuse par l&rsquo;interm\u00e9diaire des appuis. La collaboration structurelle entre la poutre et la dalle n&rsquo;est effective que lorsque des connecteurs de cisaillement appropri\u00e9s ont \u00e9t\u00e9 mis en place.<\/p>\n<h2 data-start=\"2948\" data-end=\"2971\">Fixations des appuis<\/h2>\n<p data-start=\"2973\" data-end=\"3111\">Pendant le montage, les profils acier doivent \u00eatre fix\u00e9s sur tous les appuis afin d&rsquo;\u00e9viter tout d\u00e9placement ou soul\u00e8vement avant et pendant le coulage du b\u00e9ton.<\/p>\n<p data-start=\"3113\" data-end=\"3178\">Le type de fixation d\u00e9pend de la structure porteuse :<\/p>\n<ul data-start=\"3180\" data-end=\"3336\">\n<li data-start=\"3180\" data-end=\"3232\">\n<p data-start=\"3182\" data-end=\"3232\">Vis autoperceuses sur poutres m\u00e9talliques.<\/p>\n<\/li>\n<li data-start=\"3233\" data-end=\"3289\">\n<p data-start=\"3235\" data-end=\"3289\">Syst\u00e8mes de fixation directe sur supports en acier ou en b\u00e9ton.<\/p>\n<\/li>\n<li data-start=\"3290\" data-end=\"3336\">\n<p data-start=\"3292\" data-end=\"3336\">Vis adapt\u00e9es pour les supports en bois.<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"3338\" data-end=\"3445\">Ces fixations ne participent pas \u00e0 la r\u00e9sistance structurale en phase mixte, mais elles sont indispensables pendant la phase d&rsquo;ex\u00e9cution.<\/p>\n<h2 data-start=\"3447\" data-end=\"3465\">Recommandations<\/h2>\n<ul data-start=\"3467\" data-end=\"3754\">\n<li data-start=\"3467\" data-end=\"3535\">\n<p data-start=\"3469\" data-end=\"3535\">Toujours v\u00e9rifier les longueurs minimales d&rsquo;appui conform\u00e9ment \u00e0 la NF EN 1994-1-1 (Eurocode 4).<\/p>\n<\/li>\n<li data-start=\"3536\" data-end=\"3619\">\n<p data-start=\"3538\" data-end=\"3619\">Assurer la fixation m\u00e9canique sur tous les appuis pendant la phase de coffrage.<\/p>\n<\/li>\n<li data-start=\"3620\" data-end=\"3683\">\n<p data-start=\"3622\" data-end=\"3683\">\u00c9viter les appuis pr\u00e9sentant une largeur insuffisante ou une g\u00e9om\u00e9trie irr\u00e9guli\u00e8re.<\/p>\n<\/li>\n<li data-start=\"3684\" data-end=\"3754\">\n<p data-start=\"3686\" data-end=\"3754\">Contr\u00f4ler l&rsquo;alignement des profils et des fermetures de rive avant le coulage du b\u00e9ton.<\/p>\n<\/li>\n<\/ul>\n<h2 data-start=\"3756\" data-end=\"3769\">Conclusion<\/h2>\n<p data-start=\"3771\" data-end=\"4089\">Une conception et une r\u00e9alisation correctes des appuis du plancher collaborant garantissent la stabilit\u00e9 pendant le montage ainsi qu&rsquo;une transmission efficace des charges en phase d&rsquo;exploitation. Le respect des longueurs minimales d&rsquo;appui et des exigences des normes en vigueur est indispensable pour assurer les performances structurelles du syst\u00e8me.<\/p>\n<h2>Manuel technique d\u2019Incoperfil<\/h2>\n<p data-start=\"5385\" data-end=\"5609\">Pour la d\u00e9finition compl\u00e8te du syst\u00e8me, les crit\u00e8res de conception, les bases de calcul, les tableaux de r\u00e9sistance, les d\u00e9tails constructifs et les proc\u00e9dures de mise en \u0153uvre, consultez le Manuel Technique du Plancher Collaborant d\u2019Incoperfil, disponible apr\u00e8s inscription dans la rubrique Documentation du site web.<\/p>\n<hr data-start=\"5611\" data-end=\"5614\" \/>\n<p data-start=\"5616\" data-end=\"5650\">Derni\u00e8re mise \u00e0 jour : f\u00e9vrier 2026<\/p>\n<p data-start=\"5652\" data-end=\"5886\" data-is-last-node=\"\" data-is-only-node=\"\">\u00a9 Incoperfil. Tous droits r\u00e9serv\u00e9s.<br data-start=\"5696\" data-end=\"5699\" \/>Le contenu technique de cet article fait partie du Manuel Technique du Plancher Collaborant ainsi que de la documentation enregistr\u00e9e par Incoperfil aupr\u00e8s de ColorIURIS (Acte n\u00b0 1-INCOPERFIL-12.2025).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Les appuis du plancher collaborant assurent la bonne transmission des charges entre le profil acier, le b\u00e9ton et la structure porteuse. Leur disposition et leur dimensionnement sont essentiels pour garantir la stabilit\u00e9 pendant la phase d&rsquo;ex\u00e9cution ainsi que le comportement structurel de la dalle mixte. <\/p>\n","protected":false},"author":3,"featured_media":14116,"menu_order":19,"template":"","meta":{"_acf_changed":false},"categories":[1327],"tags":[],"class_list":["post-24795","guia-tecnica","type-guia-tecnica","status-publish","has-post-thumbnail","hentry","category-guides-techniques-pour-plancher-collaborant"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Appuis du plancher collaborant sur la structure | INCOPERFIL<\/title>\n<meta name=\"description\" content=\"Appuis du plancher collaborant : types, fixations et exigences de conception pour assurer une transmission optimale des charges et la stabilit\u00e9 structurelle\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/incoperfil.com\/fr\/guia-tecnica\/18-appuis-du-plancher-collaborant-sur-la-structure\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Appuis du plancher collaborant sur la structure | INCOPERFIL\" \/>\n<meta property=\"og:description\" content=\"Appuis du plancher collaborant : types, fixations et exigences de conception pour assurer une transmission optimale des charges et la stabilit\u00e9 structurelle\" \/>\n<meta property=\"og:url\" content=\"https:\/\/incoperfil.com\/fr\/guia-tecnica\/18-appuis-du-plancher-collaborant-sur-la-structure\/\" \/>\n<meta property=\"og:site_name\" content=\"INCOPERFIL\" \/>\n<meta property=\"article:modified_time\" content=\"2026-09-14T14:41:19+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/incoperfil.com\/wp-content\/uploads\/2024\/04\/7YC0957_re02-2.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2000\" \/>\n\t<meta property=\"og:image:height\" content=\"695\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data1\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"TechArticle\",\"@id\":\"https:\\\/\\\/incoperfil.com\\\/fr\\\/guia-tecnica\\\/18-appuis-du-plancher-collaborant-sur-la-structure\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/incoperfil.com\\\/fr\\\/guia-tecnica\\\/18-appuis-du-plancher-collaborant-sur-la-structure\\\/\"},\"author\":{\"name\":\"arquitectura\",\"@id\":\"https:\\\/\\\/incoperfil.com\\\/fr\\\/#\\\/schema\\\/person\\\/b8bfc6f085f60fa29309768b0abeb4df\"},\"headline\":\"18. 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