{"id":382303,"date":"2024-09-11T12:51:57","date_gmt":"2024-09-11T12:51:57","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/382303\/"},"modified":"2024-09-11T13:44:32","modified_gmt":"2024-09-11T13:44:32","slug":"382303","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/382303\/","title":{"rendered":"Reply To: How to include effects of gravity load in Modal Analysis"},"content":{"rendered":"<p>&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p class=&#8221;&rdquo;&rdquo;&rdquo;MsoNormal&rdquo;&rdquo;&rdquo;&#8221;&gt;Hi&lt;\/p&gt;&lt;p class=&#8221;&rdquo;&rdquo;&rdquo;MsoNormal&rdquo;&rdquo;&rdquo;&#8221;&gt;What you have (mass and gravity load) will cause a pre-stress (compressive load\/stress will lower beam frequency for its bending modes) &ndash; see here for some theory details &ndash; the effect is called stress softening or stiffening (if tensile load \/stress is applied to beam say)&lt;\/p&gt;&lt;p class=&#8221;&rdquo;&rdquo;&rdquo;MsoNormal&rdquo;&rdquo;&rdquo;&#8221;&gt;&lt;br&gt;https:\/\/innovationspace.ansys.com\/courses\/wp-content\/uploads\/sites\/5\/2020\/10\/Lesson4_ApplicationsOfLargeDeformation.pdf&lt;br&gt;&lt;br&gt;This can be captured with a pre-stress modal &ndash; see here in our course for more details.&lt;br&gt;&lt;br&gt;https:\/\/innovationspace.ansys.com\/courses\/courses\/modal-analysis-in-ansys-mechanical\/lessons\/how-to-perform-prestressed-modal-analysis-lesson-2-2\/&lt;\/p&gt;&lt;p class=&#8221;&rdquo;&rdquo;&rdquo;MsoNormal&rdquo;&rdquo;&rdquo;&#8221;&gt;Also look through the rest of the courses (response spectrum)&lt;\/p&gt;&lt;p class=&#8221;&rdquo;&rdquo;&rdquo;MsoNormal&rdquo;&rdquo;&rdquo;&#8221;&gt;https:\/\/innovationspace.ansys.com\/product\/modal-analysis-in-ansys-mechanical\/&lt;\/p&gt;&lt;p class=&#8221;&rdquo;&rdquo;&rdquo;MsoNormal&rdquo;&rdquo;&rdquo;&#8221;&gt;https:\/\/innovationspace.ansys.com\/courses\/courses\/single-point-response-spectrum-analysis-using-ansys-mechanical\/lessons\/how-to-perform-response-spectrum-analysis-lesson-1\/&lt;\/p&gt;&lt;p class=&#8221;&rdquo;&rdquo;&rdquo;MsoNormal&rdquo;&rdquo;&rdquo;&#8221;&gt;Seacrh for more courses there.&lt;\/p&gt;&lt;p class=&#8221;&rdquo;&rdquo;&rdquo;MsoNormal&rdquo;&rdquo;&rdquo;&#8221;&gt;You can perhaps combine results later (so add gravity with SRSS response spectrum results say) &#8211; look on solution combination.&lt;\/p&gt;&lt;p class=&#8221;&rdquo;&rdquo;&rdquo;MsoNormal&rdquo;&rdquo;&rdquo;&#8221;&gt;All the best and good luck with your studies&lt;\/p&gt;&lt;p class=&#8221;&rdquo;&rdquo;&rdquo;MsoNormal&rdquo;&rdquo;&rdquo;&#8221;&gt;Erik&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-382303","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=\"HiWhat you have (mass and gravity load) will cause a pre-stress (compressive load\/stress will lower beam frequency for its bending modes) \u2013 see here for some theory details \u2013 the effect is called stress softening or stiffening (if tensile load \/stress is applied to beam say)https:\/\/innovationspace.ansys.com\/courses\/wp-content\/uploads\/sites\/5\/2020\/10\/Lesson4_ApplicationsOfLargeDeformation.pdfThis can be captured with a pre-stress\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" 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