{"id":196177,"date":"2021-10-28T23:57:01","date_gmt":"2021-10-28T23:57:01","guid":{"rendered":"\/forum\/forums\/reply\/196177\/"},"modified":"2021-10-28T23:58:06","modified_gmt":"2021-10-28T23:58:06","slug":"196177","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/196177\/","title":{"rendered":"Reply To: static prestress -> modal -> response spectrum &#8211; and beam results"},"content":{"rendered":"<p>Hi Lino<br \/>\nThe static structural model provides a pre-stress solution to the modal analysis to adjust the stiffness matrix to make add the stiffening that the loads provide, but don&#8217;t apply the loads in the downstream response spectrum analysis, so there are no stresses in the beams that the preload would have created.  It&#8217;s just that the stiffness of the beam has been increased by the tension.<br \/>\nTherefore the results you obtained in the response spectrum are what I would expect. You can add the stress results from the static structural bolt pretension to the stress results from the response spectrum to get the total stress.<br \/>\nRegards<br \/>\nPeter<\/p>\n","protected":false},"template":"","class_list":["post-196177","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hi Lino The static structural model provides a pre-stress solution to the modal analysis to adjust the stiffness matrix to make add the stiffening that the loads provide, but don&#039;t apply the loads in the downstream response spectrum analysis, so there are no stresses in the beams that the preload would have created. It&#039;s just\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/196177\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ansys Learning Forum | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Reply To: static prestress -&gt; modal -&gt; response spectrum \u2013 and beam results | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Hi Lino The static structural model provides a pre-stress solution to the modal analysis to adjust the stiffness matrix to make add the stiffening that the loads provide, but don&#039;t apply the loads in the downstream response spectrum analysis, so there are no stresses in the beams that the preload would have created. It&#039;s just\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/196177\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2021-10-28T23:57:01+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2021-10-28T23:58:06+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Reply To: static prestress -&gt; modal -&gt; response spectrum \u2013 and beam results | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Hi Lino The static structural model provides a pre-stress solution to the modal analysis to adjust the stiffness matrix to make add the stiffening that the loads provide, but don&#039;t apply the loads in the downstream response spectrum analysis, so there are no stresses in the beams that the preload would have created. It&#039;s just\" \/>\n\t\t<script type=\"application\/ld+json\" class=\"aioseo-schema\">\n\t\t\t{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/196177\\\/#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/196177\\\/#listItem\",\"name\":\"Reply To: static prestress -> modal -> response spectrum &#8211; and beam results\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/196177\\\/#listItem\",\"position\":2,\"name\":\"Reply To: static prestress -> modal -> response spectrum &#8211; and beam results\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}}]},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#organization\",\"name\":\"Ansys Learning Forum\",\"description\":\"Ansys Innovation Space\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/196177\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/196177\\\/\",\"name\":\"Reply To: static prestress -> modal -> response spectrum \\u2013 and beam results | Ansys Learning Forum\",\"description\":\"Hi Lino The static structural model provides a pre-stress solution to the modal analysis to adjust the stiffness matrix to make add the stiffening that the loads provide, but don't apply the loads in the downstream response spectrum analysis, so there are no stresses in the beams that the preload would have created. 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It's just","canonical_url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/196177\/","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"BreadcrumbList","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/196177\/#breadcrumblist","itemListElement":[{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum#listItem","position":1,"name":"Home","item":"https:\/\/innovationspace.ansys.com\/forum","nextItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/196177\/#listItem","name":"Reply To: static prestress -> modal -> response spectrum &#8211; and beam results"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/196177\/#listItem","position":2,"name":"Reply To: static prestress -> modal -> response spectrum &#8211; and beam results","previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum#listItem","name":"Home"}}]},{"@type":"Organization","@id":"https:\/\/innovationspace.ansys.com\/forum\/#organization","name":"Ansys Learning Forum","description":"Ansys Innovation Space","url":"https:\/\/innovationspace.ansys.com\/forum\/"},{"@type":"WebPage","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/196177\/#webpage","url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/196177\/","name":"Reply To: static prestress -> modal -> response spectrum \u2013 and beam results | Ansys Learning Forum","description":"Hi Lino The static structural model provides a pre-stress solution to the modal analysis to adjust the stiffness matrix to make add the stiffening that the loads provide, but don't apply the loads in the downstream response spectrum analysis, so there are no stresses in the beams that the preload would have created. It's just","inLanguage":"en-US","isPartOf":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/#website"},"breadcrumb":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/196177\/#breadcrumblist"},"datePublished":"2021-10-28T23:57:01+00:00","dateModified":"2021-10-28T23:58:06+00:00"},{"@type":"WebSite","@id":"https:\/\/innovationspace.ansys.com\/forum\/#website","url":"https:\/\/innovationspace.ansys.com\/forum\/","name":"Ansys Learning Forum","description":"Ansys Innovation Space","inLanguage":"en-US","publisher":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/#organization"}}]},"og:locale":"en_US","og:site_name":"Ansys Learning Forum | Ansys Innovation Space","og:type":"article","og:title":"Reply To: static prestress -&gt; modal -&gt; response spectrum \u2013 and beam results | Ansys Learning Forum","og:description":"Hi Lino The static structural model provides a pre-stress solution to the modal analysis to adjust the stiffness matrix to make add the stiffening that the loads provide, but don't apply the loads in the downstream response spectrum analysis, so there are no stresses in the beams that the preload would have created. It's just","og:url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/196177\/","article:published_time":"2021-10-28T23:57:01+00:00","article:modified_time":"2021-10-28T23:58:06+00:00","twitter:card":"summary_large_image","twitter:title":"Reply To: static prestress -&gt; modal -&gt; response spectrum \u2013 and beam results | Ansys Learning Forum","twitter:description":"Hi Lino The static structural model provides a pre-stress solution to the modal analysis to adjust the stiffness matrix to make add the stiffening that the loads provide, but don't apply the loads in the downstream response spectrum analysis, so there are no stresses in the beams that the preload would have created. 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