{"id":23762,"date":"2025-11-05T11:01:39","date_gmt":"2025-11-05T10:01:39","guid":{"rendered":"https:\/\/incoperfil.com\/?post_type=guia-tecnica&#038;p=23762"},"modified":"2026-05-18T09:01:12","modified_gmt":"2026-05-18T07:01:12","slug":"resistance-au-feu-des-planchers-collaborants","status":"publish","type":"guia-tecnica","link":"https:\/\/incoperfil.com\/fr\/guia-tecnica\/resistance-au-feu-des-planchers-collaborants\/","title":{"rendered":"8. R\u00e9sistance au feu des planchers collaborants"},"content":{"rendered":"<p data-start=\"444\" data-end=\"726\">Le plancher collaborant est une dalle mixte acier-b\u00e9ton capable d\u2019atteindre des niveaux \u00e9lev\u00e9s de r\u00e9sistance au feu sans n\u00e9cessiter de rev\u00eatements projet\u00e9s suppl\u00e9mentaires, \u00e0 condition que le dimensionnement prenne en compte l\u2019\u00e9paisseur de la dalle et l\u2019armature sp\u00e9cifique requise.<\/p>\n<p data-start=\"728\" data-end=\"1031\">En conditions normales d\u2019exploitation, le bac collaborant agit comme coffrage et armature r\u00e9sistante. En situation d\u2019incendie, sa contribution structurelle diminue \u00e0 mesure que l\u2019acier atteint des temp\u00e9ratures \u00e9lev\u00e9es ; la v\u00e9rification au feu doit donc \u00eatre assur\u00e9e par l\u2019ensemble du syst\u00e8me structurel.<\/p>\n<h3 data-section-id=\"19kgj2u\" data-start=\"1033\" data-end=\"1089\">Comportement structurel et crit\u00e8res de calcul au feu<\/h3>\n<p data-start=\"1091\" data-end=\"1272\">La r\u00e9sistance au feu du plancher collaborant est d\u00e9termin\u00e9e conform\u00e9ment \u00e0 la norme UNE-EN 1994-1-2 (Eurocode 4), qui classe les \u00e9l\u00e9ments structurels mixtes selon trois param\u00e8tres :<\/p>\n<p data-start=\"1274\" data-end=\"1602\"><strong data-start=\"1274\" data-end=\"1301\">R \u2013 Capacit\u00e9 portante :<\/strong> dur\u00e9e pendant laquelle la dalle conserve sa stabilit\u00e9 structurelle.<br data-start=\"1369\" data-end=\"1372\" \/><strong data-start=\"1372\" data-end=\"1392\">E \u2013 \u00c9tanch\u00e9it\u00e9 :<\/strong> capacit\u00e9 \u00e0 emp\u00eacher le passage des flammes ou des gaz chauds.<br data-start=\"1454\" data-end=\"1457\" \/><strong data-start=\"1457\" data-end=\"1486\">I \u2013 Isolation thermique :<\/strong> limitation de la temp\u00e9rature sur la face non expos\u00e9e, sans d\u00e9passer les augmentations fix\u00e9es par la r\u00e9glementation.<\/p>\n<p data-start=\"1604\" data-end=\"1720\">La combinaison de ces crit\u00e8res d\u00e9finit la classification REI, exprim\u00e9e en minutes (REI 30, 60, 90, 120, 180 ou 240).<\/p>\n<p data-start=\"1722\" data-end=\"1979\">Dans les planchers collaborants, le respect des valeurs exig\u00e9es est obtenu gr\u00e2ce \u00e0 l\u2019\u00e9paisseur totale de la dalle et \u00e0 la disposition de l\u2019armature inf\u00e9rieure sp\u00e9cifique, sans n\u00e9cessit\u00e9 de syst\u00e8mes externes dans les configurations de conception habituelles.<\/p>\n<h3 data-section-id=\"b27cin\" data-start=\"1981\" data-end=\"2044\">Composants et conformit\u00e9 aux exigences de r\u00e9sistance au feu<\/h3>\n<p data-start=\"2046\" data-end=\"2139\">Le comportement du plancher lors d\u2019un incendie d\u00e9pend de l\u2019interaction entre ses composants :<\/p>\n<p data-start=\"2141\" data-end=\"2360\">L\u2019armature inf\u00e9rieure de renfort absorbe les efforts de traction et garantit la capacit\u00e9 portante (R) pendant la dur\u00e9e requise. Sa section doit \u00eatre adapt\u00e9e en fonction de la classification REI et des charges de calcul.<\/p>\n<p data-start=\"2362\" data-end=\"2465\">Le bac collaborant, en restant adh\u00e9rent au b\u00e9ton, contribue \u00e0 maintenir l\u2019\u00e9tanch\u00e9it\u00e9 (E) de l\u2019ensemble.<\/p>\n<p data-start=\"2467\" data-end=\"2648\">Le b\u00e9ton, gr\u00e2ce \u00e0 sa faible conductivit\u00e9 thermique, agit comme barri\u00e8re protectrice. L\u2019\u00e9paisseur de la dalle est d\u00e9terminante pour satisfaire \u00e0 l\u2019exigence d\u2019isolation thermique (I).<\/p>\n<h3 data-section-id=\"12pxnka\" data-start=\"2650\" data-end=\"2694\">\u00c9paisseur minimale et classification REI<\/h3>\n<p data-start=\"2696\" data-end=\"2850\">Les \u00e9paisseurs minimales n\u00e9cessaires pour atteindre chaque classification REI d\u00e9pendent du profil collaborant et de la configuration structurelle adopt\u00e9e.<\/p>\n<p data-start=\"2852\" data-end=\"2871\">\u00c0 titre indicatif :<\/p>\n<ul data-start=\"2873\" data-end=\"3220\">\n<li data-section-id=\"15m9unj\" data-start=\"2873\" data-end=\"2985\"><strong data-start=\"2875\" data-end=\"2902\"><a href=\"https:\/\/incoperfil.com\/fr\/profils\/inco-70-4-collaborant\/\">INCO 70.4 Collaborant<\/a> :<\/strong> solutions courantes entre 120 et 220 mm pour des classifications REI 30 \u00e0 REI 240.<\/li>\n<li data-section-id=\"1kwxqh\" data-start=\"2986\" data-end=\"3105\"><strong data-start=\"2988\" data-end=\"3016\"><a href=\"https:\/\/incoperfil.com\/fr\/profils\/inco-100-3-collaborant\/\">INCO 100.3 Collaborant<\/a> :<\/strong> \u00e9paisseurs sup\u00e9rieures pour des classifications \u00e9lev\u00e9es, selon la port\u00e9e et les charges.<\/li>\n<li data-section-id=\"1ktbwub\" data-start=\"3106\" data-end=\"3220\"><strong data-start=\"3108\" data-end=\"3138\"><a href=\"https:\/\/incoperfil.com\/fr\/profils\/inco-100-3-r-collaborant\/\">INCO 100.3 R Collaborant<\/a> :<\/strong> optimis\u00e9 pour atteindre des classifications \u00e9lev\u00e9es avec des \u00e9paisseurs limit\u00e9es.<\/li>\n<\/ul>\n<p data-start=\"3222\" data-end=\"3313\">Les valeurs d\u00e9finitives doivent \u00eatre v\u00e9rifi\u00e9es par calcul conform\u00e9ment \u00e0 la r\u00e9glementation.<\/p>\n<p data-start=\"3315\" data-end=\"3533\">Dans certaines configurations, une couche suppl\u00e9mentaire de nivellement ou un rev\u00eatement de sol pr\u00e9sentant des propri\u00e9t\u00e9s thermiques \u00e9quivalentes peut \u00eatre pris en compte, dans les limites fix\u00e9es par la r\u00e9glementation.<\/p>\n<h3 data-section-id=\"1t7npgt\" data-start=\"3535\" data-end=\"3573\">Armature inf\u00e9rieure et disposition<\/h3>\n<p data-start=\"3575\" data-end=\"3798\">L\u2019armature inf\u00e9rieure joue un r\u00f4le essentiel dans la v\u00e9rification au feu. Elle est dispos\u00e9e de mani\u00e8re continue dans les nervures du profil, avec des enrobages d\u00e9finis selon le mod\u00e8le de profil et la classification requise.<\/p>\n<p data-start=\"3800\" data-end=\"4000\">Lorsque l\u2019armature de moment positif et l\u2019armature sp\u00e9cifique au feu co\u00efncident, le diam\u00e8tre le plus important peut \u00eatre retenu, \u00e0 condition qu\u2019il satisfasse aux exigences structurelles et thermiques.<\/p>\n<h3 data-section-id=\"1v2nm84\" data-start=\"4002\" data-end=\"4043\">Mesures compl\u00e9mentaires de protection<\/h3>\n<p data-start=\"4045\" data-end=\"4331\">Bien que le dimensionnement par l\u2019\u00e9paisseur de la dalle et l\u2019armature constitue la solution habituelle, des mesures compl\u00e9mentaires peuvent \u00eatre utilis\u00e9es, telles que des rev\u00eatements projet\u00e9s ou des faux plafonds de protection, lorsque le projet ou la r\u00e9glementation applicable l\u2019exige.<\/p>\n<p data-start=\"4333\" data-end=\"4438\">Dans ce cas, les caract\u00e9ristiques du syst\u00e8me de protection ainsi que son entretien doivent \u00eatre v\u00e9rifi\u00e9s.<\/p>\n<h3 data-section-id=\"1hif2k6\" data-start=\"4440\" data-end=\"4472\">Mat\u00e9riaux et r\u00e9action au feu<\/h3>\n<p data-start=\"4474\" data-end=\"4716\">Les mat\u00e9riaux composant le plancher collaborant \u2014 acier structurel et b\u00e9ton \u2014 sont class\u00e9s A1 ou A1FL en r\u00e9action au feu conform\u00e9ment \u00e0 la r\u00e9glementation applicable ; ils ne contribuent donc ni \u00e0 la combustion ni \u00e0 la propagation des flammes.<\/p>\n<h3 data-section-id=\"14vsycz\" data-start=\"4718\" data-end=\"4755\">Profils collaborants d\u2019Incoperfil<\/h3>\n<p data-start=\"4757\" data-end=\"4937\">La gamme de profils collaborants d\u2019<span class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"><span class=\"whitespace-normal\">Incoperfil<\/span><\/span> permet d\u2019adapter la solution structurelle \u00e0 diff\u00e9rents niveaux d\u2019exigence en mati\u00e8re de r\u00e9sistance au feu :<\/p>\n<p data-start=\"4939\" data-end=\"5053\"><a href=\"https:\/\/incoperfil.com\/fr\/profils\/inco-70-4-collaborant\/\"><strong data-start=\"4939\" data-end=\"4964\">INCO 70.4 Collaborant<\/strong><\/a><br data-start=\"4964\" data-end=\"4967\" \/>Profil \u00e0 nervure moyenne adapt\u00e9 \u00e0 diverses classifications REI selon la configuration.<\/p>\n<p data-start=\"5055\" data-end=\"5192\"><a href=\"https:\/\/incoperfil.com\/fr\/profils\/inco-100-3-collaborant\/\"><strong data-start=\"5055\" data-end=\"5081\">INCO 100.3 Collaborant<\/strong><\/a><br data-start=\"5081\" data-end=\"5084\" \/>Profil polyvalent pour port\u00e9es moyennes, permettant d\u2019atteindre des classifications \u00e9lev\u00e9es selon le calcul.<\/p>\n<p data-start=\"5194\" data-end=\"5286\"><a href=\"https:\/\/incoperfil.com\/fr\/profils\/inco-100-3-r-collaborant\/\"><strong data-start=\"5194\" data-end=\"5222\">INCO 100.3 R Collaborant<\/strong><\/a><br data-start=\"5222\" data-end=\"5225\" \/>Variante destin\u00e9e aux exigences \u00e9lev\u00e9es de r\u00e9sistance au feu.<\/p>\n<p data-start=\"5288\" data-end=\"5392\">Tous les mod\u00e8les sont fabriqu\u00e9s conform\u00e9ment \u00e0 la r\u00e9glementation en vigueur et disposent du marquage CE.<\/p>\n<h3 data-section-id=\"1079bb9\" data-start=\"5394\" data-end=\"5408\">Conclusion<\/h3>\n<p data-start=\"5410\" data-end=\"5787\">La r\u00e9sistance au feu des planchers collaborants fait partie int\u00e9grante du dimensionnement structurel du syst\u00e8me et doit \u00eatre v\u00e9rifi\u00e9e conform\u00e9ment \u00e0 la norme UNE-EN 1994-1-2. L\u2019\u00e9paisseur de la dalle et l\u2019armature inf\u00e9rieure constituent les \u00e9l\u00e9ments cl\u00e9s pour garantir la classification REI requise, assurant stabilit\u00e9, \u00e9tanch\u00e9it\u00e9 et isolation thermique pendant la dur\u00e9e exig\u00e9e.<\/p>\n<h3 data-section-id=\"10iorbq\" data-start=\"5789\" data-end=\"5822\">Manuel technique d\u2019Incoperfil<\/h3>\n<p data-start=\"5824\" data-end=\"6168\">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\u2019<span class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"><span class=\"whitespace-normal\">Incoperfil<\/span><\/span>, disponible apr\u00e8s inscription dans la section Documentation du site web.<\/p>\n<p data-start=\"6170\" data-end=\"6209\">Derni\u00e8re mise \u00e0 jour : f\u00e9vrier 2026<\/p>\n<p data-start=\"6211\" data-end=\"6443\" data-is-last-node=\"\" data-is-only-node=\"\">\u00a9 Incoperfil. Tous droits r\u00e9serv\u00e9s.<br data-start=\"6246\" data-end=\"6249\" \/>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 profils collaborants d\u2019Incoperfil permettent de concevoir des planchers pr\u00e9sentant des classifications REI \u00e9lev\u00e9es gr\u00e2ce \u00e0 une conception appropri\u00e9e de l\u2019\u00e9paisseur de la dalle et de l\u2019armature inf\u00e9rieure. La r\u00e9sistance au feu du syst\u00e8me est d\u00e9finie conform\u00e9ment \u00e0 la r\u00e9glementation europ\u00e9enne et fait partie int\u00e9grante du dimensionnement structurel du projet.<\/p>\n","protected":false},"author":2,"featured_media":14116,"menu_order":9,"template":"","meta":{"_acf_changed":false},"categories":[1327],"tags":[],"class_list":["post-23762","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 v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>8. 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