{"id":24914,"date":"2026-09-07T10:50:46","date_gmt":"2026-09-07T08:50:46","guid":{"rendered":"https:\/\/incoperfil.com\/?post_type=guia-tecnica&#038;p=24914"},"modified":"2026-09-17T11:23:01","modified_gmt":"2026-09-17T09:23:01","slug":"21-porte-a-faux-et-ouvertures-dans-le-plancher-collaborant","status":"publish","type":"guia-tecnica","link":"https:\/\/incoperfil.com\/fr\/guia-tecnica\/21-porte-a-faux-et-ouvertures-dans-le-plancher-collaborant\/","title":{"rendered":"21. Porte-\u00e0-faux et ouvertures dans le plancher collaborant"},"content":{"rendered":"<p>Le plancher collaborant est un syst\u00e8me mixte acier-b\u00e9ton qui permet des adaptations g\u00e9om\u00e9triques, \u00e0 condition que son comportement structurel soit v\u00e9rifi\u00e9. Les porte-\u00e0-faux et les ouvertures dans le plancher collaborant n\u00e9cessitent une attention particuli\u00e8re lors de la <a href=\"https:\/\/incoperfil.com\/fr\/guia-tecnica\/comment-concevoir-un-plancher-collaborant\/\">conception<\/a> et de la <a href=\"https:\/\/incoperfil.com\/fr\/guia-tecnica\/16-mise-en-oeuvre-du-plancher-collaborant-pose-fixations-et-betonnage\/\">mise en \u0153uvre<\/a>, car ils modifient le sch\u00e9ma r\u00e9sistant et la r\u00e9partition des efforts dans la dalle.<\/p>\n<h2 data-start=\"906\" data-end=\"944\">Porte-\u00e0-faux dans le plancher collaborant<\/h2>\n<p class=\"PDq2pG_selectionAnchorContainer\" data-start=\"331\" data-end=\"529\">Les porte-\u00e0-faux dans le sens des nervures sont les plus courants, car il s\u2019agit d\u2019un syst\u00e8me structurel unidirectionnel. Ils sont utilis\u00e9s pour les balcons, les d\u00e9bords de toiture ou les prolongements de dalle sans appui direct.<\/p>\n<h3 style=\"padding-left: 40px;\" data-start=\"531\" data-end=\"701\">Phase de coffrage<\/h3>\n<p class=\"\" style=\"padding-left: 40px;\" data-start=\"531\" data-end=\"701\">La t\u00f4le collaborante doit \u00eatre v\u00e9rifi\u00e9e vis-\u00e0-vis des sollicitations et des d\u00e9formations produites lors du coulage du b\u00e9ton. En r\u00e8gle g\u00e9n\u00e9rale :<\/p>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul data-start=\"703\" data-end=\"907\">\n<li data-section-id=\"9uafx5\" data-start=\"703\" data-end=\"811\"><strong>Jusqu\u2019\u00e0 environ 500 mm<\/strong> de porte-\u00e0-faux, il est possible de r\u00e9aliser la solution sans \u00e9taiement suppl\u00e9mentaire, sous r\u00e9serve de v\u00e9rification.<\/li>\n<li data-section-id=\"uwpts0\" data-start=\"812\" data-end=\"907\"><strong>Pour des porte-\u00e0-faux sup\u00e9rieurs \u00e0 500 mm<\/strong>, un \u00e9taiement temporaire doit \u00eatre pr\u00e9vu pendant le b\u00e9tonnage \u00e0 l\u2019extr\u00e9mit\u00e9 du porte-\u00e0-faux.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3 style=\"padding-left: 40px;\" data-start=\"909\" data-end=\"1206\">Phase mixte<\/h3>\n<p style=\"padding-left: 40px;\" data-start=\"909\" data-end=\"1206\">La partie en porte-\u00e0-faux doit \u00eatre dimensionn\u00e9e en tenant compte de l\u2019armature sup\u00e9rieure n\u00e9cessaire pour les moments n\u00e9gatifs et du contr\u00f4le des d\u00e9formations \u00e0 l\u2019extr\u00e9mit\u00e9 du porte-\u00e0-faux. <strong>La longueur du porte-\u00e0-faux ne doit pas d\u00e9passer 1,00 m<\/strong> ; pour des dimensions sup\u00e9rieures, une structure porteuse sp\u00e9cifique devra \u00eatre pr\u00e9vue.<\/p>\n<p style=\"padding-left: 40px;\" data-start=\"1208\" data-end=\"1380\">Les porte-\u00e0-faux perpendiculaires aux nervures n\u00e9cessitent dans tous les cas une structure porteuse suppl\u00e9mentaire, car le profil collaborant travaille exclusivement dans le sens de ses nervures.<\/p>\n<h2 data-start=\"1969\" data-end=\"2004\">Ouvertures dans le plancher collaborant<\/h2>\n<p data-start=\"2006\" data-end=\"2114\">Les ouvertures permettent le passage des installations ou des conduits \u00e0 travers le plancher. Leur traitement d\u00e9pend principalement de leurs dimensions et de leur position dans la dalle.<\/p>\n<h3 style=\"padding-left: 40px;\">Petites ouvertures<\/h3>\n<p style=\"padding-left: 40px;\" data-start=\"2138\" data-end=\"2265\">Les ouvertures allant jusqu\u2019\u00e0 environ <strong data-start=\"1036\" data-end=\"1052\">300 \u00d7 300 mm<\/strong> peuvent \u00eatre r\u00e9alis\u00e9es sans renforts suppl\u00e9mentaires, \u00e0 condition que les conditions de conception pr\u00e9vues pour ce type d\u2019ouverture soient respect\u00e9es.<\/p>\n<h3 style=\"padding-left: 40px;\">Ouvertures moyennes<\/h3>\n<p style=\"padding-left: 40px;\" data-start=\"2289\" data-end=\"2435\">Les ouvertures sup\u00e9rieures \u00e0 <strong data-start=\"1229\" data-end=\"1245\">300 \u00d7 300 mm<\/strong> et allant jusqu\u2019\u00e0 environ <strong data-start=\"1273\" data-end=\"1289\">700 \u00d7 700 mm<\/strong> n\u00e9cessitent une armature de renforcement suppl\u00e9mentaire, correctement dimensionn\u00e9e afin de redistribuer les charges autour de l\u2019ouverture.<\/p>\n<h3 style=\"padding-left: 40px;\">Grandes ouvertures<\/h3>\n<p style=\"padding-left: 40px;\" data-start=\"2458\" data-end=\"2625\">Les ouvertures sup\u00e9rieures \u00e0 <strong data-start=\"1461\" data-end=\"1477\">700 \u00d7 700 mm<\/strong> constituent une interruption significative du plancher et n\u00e9cessitent une structure p\u00e9riph\u00e9rique secondaire capable de reprendre les charges et de les transmettre \u00e0 la structure principale.<\/p>\n<p data-start=\"2627\" data-end=\"2864\">Les ouvertures doivent de pr\u00e9f\u00e9rence \u00eatre d\u00e9finies avant le b\u00e9tonnage. Il convient d\u2019\u00e9viter de percer le plancher une fois le b\u00e9ton durci, car cela peut affecter la connexion entre le profil collaborant et la dalle. Lorsque l\u2019ouverture a \u00e9t\u00e9 pr\u00e9vue au pr\u00e9alable, elle peut \u00eatre d\u00e9limit\u00e9e au moyen d\u2019un coffrage int\u00e9rieur, puis la t\u00f4le peut \u00eatre d\u00e9coup\u00e9e une fois que le b\u00e9ton a atteint la r\u00e9sistance n\u00e9cessaire.<\/p>\n<h2 data-start=\"2866\" data-end=\"2893\">Int\u00e9gration dans la conception<\/h2>\n<p data-start=\"2895\" data-end=\"2989\">La possibilit\u00e9 d\u2019int\u00e9grer des porte-\u00e0-faux et des ouvertures \u00e9largit les applications du syst\u00e8me, \u00e0 condition que :<\/p>\n<ul>\n<li data-start=\"2895\" data-end=\"2989\">Son <a href=\"https:\/\/incoperfil.com\/fr\/guia-tecnica\/comment-calculer-un-plancher-collaborant-tableaux-de-resistance-et-note-de-calcul\/\">comportement structurel<\/a> soit v\u00e9rifi\u00e9 aussi bien pendant la <a href=\"https:\/\/incoperfil.com\/fr\/guia-tecnica\/6-phases-du-plancher-collaborant-coffrage-et-phase-mixte\/\">phase de coffrage qu\u2019en phase mixte<\/a>.<\/li>\n<li>Les <a href=\"https:\/\/incoperfil.com\/fr\/guia-tecnica\/14-types-darmatures-dans-le-plancher-collaborant\/\">armatures<\/a> n\u00e9cessaires soient correctement dimensionn\u00e9es dans chaque cas.<\/li>\n<li>Une armature de renforcement suppl\u00e9mentaire soit pr\u00e9vue autour des ouvertures moyennes et une structure p\u00e9riph\u00e9rique secondaire dans le cas des grandes ouvertures.<\/li>\n<\/ul>\n<p><\/p>\n<p data-start=\"3252\" data-end=\"3388\">Les profils <a href=\"https:\/\/incoperfil.com\/fr\/profils\/inco-70-4-collaborant\/\">INCO 70.4<\/a>, <a href=\"https:\/\/incoperfil.com\/fr\/profils\/inco-100-3-collaborant\/\">INCO 100.3<\/a> et <a href=\"https:\/\/incoperfil.com\/fr\/profils\/inco-100-3-r-collaborant\/\">INCO 100.3 R<\/a> permettent de s\u2019adapter \u00e0 diff\u00e9rentes configurations, toujours sous r\u00e9serve d\u2019une v\u00e9rification structurelle.<\/p>\n<h2 data-start=\"3390\" data-end=\"3403\">Conclusion<\/h2>\n<p>Les porte-\u00e0-faux et les ouvertures dans le plancher collaborant font partie des solutions courantes de cette typologie de plancher lorsqu\u2019ils sont d\u00e9finis conform\u00e9ment \u00e0 des crit\u00e8res structurels appropri\u00e9s. La v\u00e9rification des moments, des d\u00e9formations et des renforcements locaux garantit la continuit\u00e9 de la r\u00e9sistance et la s\u00e9curit\u00e9 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 <a href=\"https:\/\/incoperfil.com\/fr\/documentation\/\">Manuel Technique du Plancher Collaborant<\/a> d\u2019Incoperfil, disponible sur 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 : septembre 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 et 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 porte-\u00e0-faux et les ouvertures dans le plancher permettent de r\u00e9aliser des d\u00e9bords et des passages pour les installations tout en maintenant la continuit\u00e9 structurelle de la dalle mixte. Leur d\u00e9finition correcte n\u00e9cessite de v\u00e9rifier la r\u00e9sistance et les d\u00e9formations conform\u00e9ment aux crit\u00e8res de conception du syst\u00e8me.<\/p>\n","protected":false},"author":2,"featured_media":14116,"menu_order":22,"template":"","meta":{"_acf_changed":false},"categories":[1327],"tags":[],"class_list":["post-24914","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 v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>21. Porte-\u00e0-faux et ouvertures dans le plancher collaborant - INCOPERFIL<\/title>\n<meta name=\"description\" content=\"Solutions pour les porte-\u00e0-faux et les ouvertures dans les planchers collaborants : dimensions, renforts et recommandations de mise en \u0153uvre. 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