{"id":2013,"date":"2026-04-27T11:42:06","date_gmt":"2026-04-27T11:42:06","guid":{"rendered":"https:\/\/protasoftware.com\/fr\/wiki\/methode-de-signe-des-resultats-pour-l-analyse-par-spectre-de-reponse\/"},"modified":"2026-04-27T11:42:06","modified_gmt":"2026-04-27T11:42:06","slug":"methode-de-signe-des-resultats-pour-l-analyse-par-spectre-de-reponse","status":"publish","type":"wiki","link":"https:\/\/protasoftware.com\/fr\/support\/manuels-techniques\/methode-de-signe-des-resultats-pour-l-analyse-par-spectre-de-reponse\/","title":{"rendered":"M\u00e9thode de signe des r\u00e9sultats pour l&rsquo;analyse par spectre de r\u00e9ponse"},"content":{"rendered":"<div>L&rsquo;analyse par spectre de r\u00e9ponse calcule et combine les r\u00e9ponses maximales pseudo-modales des modes propres de vibration par rapport \u00e0 un spectre de calcul donn\u00e9. Chaque mode est consid\u00e9r\u00e9 comme un syst\u00e8me ind\u00e9pendant \u00e0 un seul degr\u00e9 de libert\u00e9. <\/div>\n<div><\/div>\n<div>Lors de la combinaison des vecteurs de r\u00e9sultats modaux, le signe des d\u00e9placements et des efforts internes est perdu. La condition d&rsquo;\u00e9quilibre n&rsquo;est donc plus satisfaite. Si vous contr\u00f4lez la d\u00e9form\u00e9e de la structure sous les cas de charge du spectre de r\u00e9ponse, elle peut sembler \u00e9trange. Les diagrammes d&rsquo;efforts internes restent aussi toujours positifs apr\u00e8s la combinaison. Ce comportement est attendu. C&rsquo;est le r\u00e9sultat normal d&rsquo;une analyse par spectre de r\u00e9ponse.<\/div>\n<div><\/div>\n<div>Le plus souvent, on contourne ce point pendant le calcul. Il suffit de combiner les cas de charge RSA avec les cas de charge permanente et d&rsquo;exploitation, avec des coefficients n\u00e9gatifs et positifs. Pour les v\u00e9rifications de fl\u00e8che et les autres v\u00e9rifications structurelles, les signes des efforts internes et des d\u00e9placements peuvent cependant \u00eatre n\u00e9cessaires.<\/div>\n<div><\/div>\n<div>Pour cela, ProtaStructure propose un param\u00e8tre qui permet d&rsquo;utiliser soit les \u00ab Valeurs absolues \u00bb, soit le \u00ab Signe du mode dominant \u00bb pour le signe des r\u00e9sultats RSA. Cette option se trouve dans l&rsquo;onglet <b>Param\u00e8tres sismiques<\/b> &gt; <b>Param\u00e8tres <\/b>.&nbsp;<\/div>\n<div><\/div>\n<p><img decoding=\"async\" style=\"padding: 0px;max-width: 100%\" src=\"https:\/\/protasoftware.com\/wp-content\/uploads\/2026\/09\/hc-f1bbac02761a.png\"><\/p>\n<div><\/div>\n<div>Si les signes du mode dominant sont utilis\u00e9s pour l&rsquo;ensemble des r\u00e9sultats RSA, le mode dominant est choisi selon sa participation massique dans un degr\u00e9 de libert\u00e9 donn\u00e9. Le signe de ce mode s&rsquo;applique alors au cas de charge RSA concern\u00e9, dans la direction correspondante. Cette approche peut donner des r\u00e9sultats inattendus dans les structures tr\u00e8s irr\u00e9guli\u00e8res. C&rsquo;est le cas lorsque le mode dominant est un mode de torsion, ou un mode de translation fortement coupl\u00e9.<\/div>\n<div><\/div>\n<div>Si cette option n&rsquo;est pas visible dans Param\u00e8tres sismiques &gt; Param\u00e8tres, agrandissez la fen\u00eatre Param\u00e8tres sismiques.<\/div>\n<div><\/div>\n<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\" data-type=\"non-resize\" src=\"https:\/\/protasoftware.com\/wp-content\/uploads\/2026\/04\/prota-doc-480584cbb1f556dffab6402da2635df3.png\"><\/p>\n<div>Dans ProtaStructure 2026, la m\u00e9thode de signe des r\u00e9sultats pour la RSA utilisera uniquement la valeur absolue.<\/div>\n<p><\/span><\/div>\n<\/div>\n<div>\n<p><\/div>\n<div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>L&rsquo;analyse par spectre de r\u00e9ponse calcule et combine les r\u00e9ponses maximales pseudo-modales des modes propres de vibration par rapport \u00e0 un spectre de calcul donn\u00e9.&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":[54],"whitepaper_topic":[],"whitepaper_product":[],"whitepaper_type":[],"class_list":["post-2013","wiki","type-wiki","status-publish","hentry","category-protastructure-design-guides"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.9 (Yoast SEO v27.9) - 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