{"id":2150,"date":"2026-04-27T12:11:03","date_gmt":"2026-04-27T12:11:03","guid":{"rendered":"https:\/\/protasoftware.com\/fr\/wiki\/forces-negligeables-pour-le-calcul-des-poutres-24-10-2018\/"},"modified":"2026-04-27T12:11:03","modified_gmt":"2026-04-27T12:11:03","slug":"forces-negligeables-pour-le-calcul-des-poutres-24-10-2018","status":"publish","type":"wiki","link":"https:\/\/protasoftware.com\/fr\/support\/manuels-techniques\/forces-negligeables-pour-le-calcul-des-poutres-24-10-2018\/","title":{"rendered":"Forces n\u00e9gligeables pour le calcul des poutres 24 10 2018"},"content":{"rendered":"<div><span class=\"colour\">Les efforts de poutre pris en compte automatiquement dans le calcul de section de poutre sont&nbsp; <\/span><b><i><span class=\"colour\">Moment de flexion majeur<\/span><\/i><\/b><span class=\"colour\">,&nbsp; <\/span><b><i><span class=\"colour\">Effort tranchant majeur<\/span><\/i><\/b><span class=\"colour\">&nbsp;&amp;&nbsp;<\/span><b><i><span class=\"colour\">Torsion<\/span><\/i><\/b><span class=\"colour\">. <br \/><\/span><\/div>\n<div><span class=\"colour\"><\/span><\/div>\n<div><span class=\"colour\">Les efforts de poutre qui ne sont pas pris en compte automatiquement (ni m\u00eame v\u00e9rifi\u00e9s) sont&nbsp; <\/span><b><i><span class=\"colour\">Effort de traction axial,<\/span><\/i><\/b><span class=\"colour\"> <\/span><b><i><span class=\"colour\">Moment de flexion selon l&rsquo;axe mineur&nbsp;&amp;&nbsp;Effort tranchant selon l&rsquo;axe mineur.&nbsp;<\/span><\/i><\/b><\/div>\n<div><span><span class=\"colour\">Ils sont collectivement appel\u00e9s&nbsp; <\/span><\/span><b><i><span class=\"colour\">Efforts n\u00e9gligeables<\/span><\/i><\/b><span><span class=\"colour\">&nbsp;dans&nbsp;Param\u00e8tres de calcul des poutres&nbsp;&gt;&nbsp;onglet Calcul&nbsp;(comme illustr\u00e9 ci-dessous).<\/span><\/span><\/div>\n<div><span class=\"colour\"><\/span><\/div>\n<div><img decoding=\"async\" data-zdeskdocselectedclass=\"best\" class=\"docsimage\" data-zdeskdocid=\"img_0021094559111769495\" style=\"max-width: 100%;padding: 0px;width: 736px;height: auto\" src=\"https:\/\/protasoftware.com\/wp-content\/uploads\/2026\/04\/prota-doc-4ba4418f1622c97ca54b54a9d319c8a4.png\"><\/div>\n<div><\/div>\n<div><span class=\"KB_New_Editor_Highlights\" style=\"margin: 10px 0px;position: relative;padding: 10px 10px 10px 40px\"><img decoding=\"async\" alt=\"Notes\" data-image=\"contentStyle\" style=\"position: absolute;left: 12px;top: 14px;width: 15px;max-width: 100%\" data-type=\"non-resize\" src=\"https:\/\/protasoftware.com\/wp-content\/uploads\/2026\/04\/prota-doc-17477ea5d5dafee220f4e5e90c0fa3e2.png\"><\/p>\n<div><span class=\"colour\">Les utilisateurs peuvent d\u00e9finir leurs efforts n\u00e9gligeables pr\u00e9f\u00e9r\u00e9s selon leur propre jugement ou leurs propres calculs d&rsquo;ing\u00e9nierie<\/span><span>.&nbsp;<\/span><\/div>\n<p><\/span><\/div>\n<div><span class=\"KB_New_Editor_Highlights\" style=\"margin: 10px 0px;position: relative;padding: 10px 10px 10px 40px\"><img decoding=\"async\" alt=\"Info\" data-image=\"contentStyle\" style=\"position: absolute;left: 12px;top: 14px;width: 15px;max-width: 100%\" data-type=\"non-resize\" src=\"https:\/\/protasoftware.com\/wp-content\/uploads\/2026\/04\/prota-doc-c62724eba5b0f868d192fd30123e70a0.png\"><\/p>\n<div><span>Si les efforts de calcul r\u00e9els d\u00e9passent les valeurs des efforts n\u00e9gligeables, la poutre sera marqu\u00e9e &quot;\u00c9chec&quot; avec une croix rouge&nbsp;m\u00eame si les armatures pr\u00e9vues sont suffisantes.<\/span><\/div>\n<p><\/span><\/div>\n<div><span class=\"colour\">Lorsque vous double-cliquez sur ces poutres dans&nbsp; <\/span><i><b><span class=\"colour\">Ferraillage des poutres<\/span><\/b><\/i><span class=\"colour\">&nbsp;pour ouvrir la bo\u00eete de dialogue des donn\u00e9es de ferraillage, ou que vous s\u00e9lectionnez les poutres en vue en plan puis effectuez un clic droit et s\u00e9lectionnez <\/span><i><b><span class=\"colour\">&quot;Calcul de section de poutre&quot;<\/span><\/b><span class=\"colour\">,<\/span><\/i><span class=\"colour\"> cela affichera un ou plusieurs avertissements indiquant que l&rsquo;effort de traction axial de calcul, l&rsquo;effort tranchant selon l&rsquo;axe mineur et\/ou le moment de flexion selon l&rsquo;axe mineur d\u00e9passe(nt) les limites n\u00e9gligeables.<\/span><\/div>\n<p style=\"line-height: 20px;font-style: normal;font-weight: 400;letter-spacing: normal;text-indent: 0px;text-transform: none;white-space: normal\"><img decoding=\"async\" src=\"https:\/\/protasoftware.com\/wp-content\/uploads\/2026\/09\/hc-662ebd2200d0.png\" style=\"padding: 0px;max-width: 100%;width: 498px;height: 329px\" class=\"docsimage\" data-zdeskdocid=\"img_3428055636979941\" data-zdeskdocselectedclass=\"original\"><\/p>\n<div><span class=\"colour\">Vous pouvez \u00e9galement retrouver le message d&rsquo;avertissement dans <\/span><b><i><span class=\"colour\">&quot;Poutres d&rsquo;\u00e9tage&quot; <\/span><\/i><\/b><span class=\"colour\">sous l&rsquo;onglet <\/span><b><i><span class=\"colour\">&quot;Calcul&quot; <\/span><\/i><\/b><span class=\"colour\">apr\u00e8s avoir calcul\u00e9 les poutres en mode par lot :<\/span><\/div>\n<div><\/div>\n<div><img decoding=\"async\" src=\"https:\/\/protasoftware.com\/wp-content\/uploads\/2026\/09\/hc-7d3940a0d37c.png\" style=\"padding: 0px;max-width: 100%;width: 669px;height: auto\" class=\"docsimage currimg\" data-zdeskdocid=\"img_22130771733831467\" data-zdeskdocselectedclass=\"best\"> <\/div>\n<div>\n<div>\n<h2 id=\"Why_does_a_beam_have_high_tensile__ignorable_force\" class=\"toc_anchors\"><span class=\"colour\">Pourquoi une poutre a-t-elle un effort de traction \u00e9lev\u00e9 ou un effort n\u00e9gligeable ?<\/span><\/h2>\n<div><span>Il existe de nombreuses raisons pour lesquelles une poutre peut pr\u00e9senter un effort de traction \u00e9lev\u00e9 ou d&rsquo;autres efforts n\u00e9gligeables :<\/span><\/div>\n<\/div>\n<div><span class=\"colour\">1.&nbsp;&nbsp; La poutre n&rsquo;est pas reli\u00e9e \u00e0 une dalle et n&rsquo;est donc pas retenue par le diaphragme form\u00e9 par les dalles ; elle est donc libre de s&rsquo;allonger ou de fl\u00e9chir dans le plan du plancher, ce qui produit un effort de traction et\/ou un moment de flexion et un effort tranchant selon l&rsquo;axe mineur.<\/span><\/div>\n<div><span class=\"colour\">2.&nbsp; Sous des charges \u00e9lev\u00e9es, en particulier des charges lat\u00e9rales, les poutres non retenues par le diaphragme peuvent d\u00e9velopper des efforts n\u00e9gligeables \u00e9lev\u00e9s<\/span><\/div>\n<div><span class=\"colour\">3.&nbsp; Mod\u00e9lisation incorrecte &#8211; si la poutre est instable, par exemple non support\u00e9e &#8211; l&rsquo;ensemble du mod\u00e8le peut s&rsquo;effondrer, entra\u00eenant des efforts inattendus ou erron\u00e9s<\/span><\/div>\n<div><span style=\"margin: 10px 0px;position: relative;padding: 10px 10px 10px 40px\" class=\"KB_New_Editor_Highlights\"><img decoding=\"async\" src=\"https:\/\/protasoftware.com\/wp-content\/uploads\/2026\/04\/prota-doc-788c033e9ccb5b4f4c54c0014a8908bc.png\" data-type=\"non-resize\" style=\"position: absolute;left: 12px;top: 14px;width: 15px;max-width: 100%\" data-image=\"contentStyle\" alt=\"Notes\"><\/p>\n<div><span class=\"colour\">Pour v\u00e9rifier cela, consultez le <a target=\"_blank\" href=\"https:\/\/support.protasoftware.com\/portal\/en\/kb\/articles\/post-analysis-ps-2022\" rel=\"noopener noreferrer\">Mod\u00e8le analytique<\/a><\/span><span class=\"colour\">&nbsp;afin de v\u00e9rifier la validit\u00e9 de votre mod\u00e8le. <\/span><\/div>\n<div><span class=\"colour\">Consultez&nbsp; <\/span><span> <\/span><a target=\"_blank\" href=\"https:\/\/support.protasoftware.com\/portal\/en\/kb\/articles\/how-to-check-singularity-or-large-deformation-warnings-during-building-analysis\" rel=\"noopener noreferrer\">Comment v\u00e9rifier les avertissements de singularit\u00e9 ou de d\u00e9formation importante pendant l&rsquo;analyse du b\u00e2timent<\/a><span>&nbsp;<\/span><span class=\"colour\">pour plus d&rsquo;informations sur la v\u00e9rification de votre mod\u00e8le.<\/span><\/div>\n<p><\/span><\/div>\n<div>\n<div><u><b><span style=\"font-size: 18px\" class=\"size\"><\/span><\/b><\/u><\/div>\n<h2 id=\"What_can_be_done_if_beam_fails_ignorable_forces\" class=\"toc_anchors\"><span class=\"colour\">Que faire si une poutre \u00e9choue aux efforts n\u00e9gligeables<\/span><\/h2>\n<div><span>Il existe plusieurs mesures possibles lorsque des poutres \u00e9chouent en raison des efforts n\u00e9gligeables :<\/span><\/div>\n<\/div>\n<\/div>\n<ol>\n<li style=\"list-style-type: disc\"><span class=\"colour\">L&rsquo;utilisateur doit v\u00e9rifier manuellement la capacit\u00e9 de la poutre \u00e0 l&rsquo;aide de ses propres calculs.<\/span><\/li>\n<li style=\"list-style-type: disc\"><span class=\"colour\">Si l&rsquo;utilisateur estime que la poutre satisfait en r\u00e9alit\u00e9 l&rsquo;effort n\u00e9gligeable, il peut forcer manuellement le r\u00e9sultat en ouvrant le Calcul interactif des poutres et en choisissant <\/span><b><i><span class=\"colour\">&quot;OK&quot;<\/span><\/i><\/b><span class=\"colour\"> pour forcer la poutre \u00e0 un <\/span><b><i><span class=\"colour\">&quot;Succ\u00e8s&quot;<\/span><\/i><\/b><span class=\"colour\"> (comme illustr\u00e9 ci-dessous)<\/span><br \/><img decoding=\"async\" src=\"https:\/\/protasoftware.com\/wp-content\/uploads\/2026\/09\/hc-5233e8fd8a02.png\" style=\"padding: 0px;max-width: 100%;width: 598px;height: auto\" class=\"docsimage\" data-zdeskdocid=\"img_6798451225385245\" data-zdeskdocselectedclass=\"\"><\/li>\n<\/ol>\n<ol>\n<li style=\"list-style-type: disc\"><span class=\"colour\">L&rsquo;utilisateur peut \u00e9galement modifier ou augmenter les valeurs limites des efforts n\u00e9gligeables.&nbsp; Par exemple, il est possible de calculer la capacit\u00e9 de traction typique d&rsquo;une poutre \u00e0 l&rsquo;aide de l&rsquo;\u00e9quation ci-dessous.<\/span><\/li>\n<ol>\n<li style=\"list-style-type: circle\"><span class=\"colour\">Capacit\u00e9 de traction de la poutre =&nbsp;<\/span><i><span class=\"colour\"> (<\/span><b><span class=\"colour\">Nombre de barres<\/span><\/b><span class=\"colour\"> x <\/span><b><span class=\"colour\">Section transversale de chaque barre<\/span><\/b><span class=\"colour\"> x&nbsp;<\/span><b><span class=\"colour\">Limite d&rsquo;\u00e9lasticit\u00e9 de l&rsquo;acier<\/span><\/b><span class=\"colour\">)<\/span><\/i><\/li>\n<li style=\"list-style-type: circle\"><span class=\"colour\">Ainsi, davantage de poutres peuvent r\u00e9ussir automatiquement si l&rsquo;effort de traction de calcul est inf\u00e9rieur \u00e0 l&rsquo;effort de traction n\u00e9gligeable saisi manuellement.<\/span><\/li>\n<\/ol>\n<\/ol>\n<div><\/div>\n<p style=\"line-height: 20px;font-style: normal;font-weight: 400;letter-spacing: normal;text-indent: 0px;text-transform: none;white-space: normal\"><\/p>\n<div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Les efforts de poutre pris en compte automatiquement dans le calcul de section de poutre sont&nbsp; Moment de flexion majeur,&nbsp; Effort tranchant majeur&nbsp;&amp;&nbsp;Torsion. Les efforts&hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"template":"","meta":{"_whitepaper_youtube_videos":"","_whitepaper_youtube_url":"","_whitepaper_youtube_thumbnail":"","footnotes":""},"categories":[9],"whitepaper_topic":[],"whitepaper_product":[],"whitepaper_type":[],"class_list":["post-2150","wiki","type-wiki","status-publish","hentry","category-beam-section-design"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.9 (Yoast SEO v27.9) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Forces n\u00e9gligeables pour le calcul des poutres<\/title>\n<meta name=\"description\" content=\"Ce guide explique quelles forces peuvent \u00eatre n\u00e9glig\u00e9es lors du calcul des poutres, afin de simplifier et fiabiliser le dimensionnement structurel.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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