![\"\"](\"https:\/\/support.buildsoft.eu\/wp-content\/uploads\/2021\/09\/KnopModalAnalysis.png\")
, the error below appears:<\/p>\nWhen starting the elastic analysis of a model with a dynamic load or when starting a model analysis , the error below appears:<\/p>\n
![\"\"](\"https:\/\/support.buildsoft.eu\/wp-content\/uploads\/2019\/09\/ErrorSystemMathSign.png\")
<\/p>\n
The error can be caused by a lack of stiffness\/too many degrees of freedom<\/strong>. The lack of stiffness can be in the cross-sections, the material(s), the supports or the internal boundary conditions (hinges).<\/p>\n \r\n \t\t\t\t\tThis solution is not relevant when you perform only a model analysis \t\t\t\t<\/p>\r\n \t\t\t \t\t\t\r\n \t\t<\/div>\r\n \t\t\n This error can also be caused by a malfunction in the load groups.<\/p>\n You’re trying to exclude the self-weight from the modal analysis.<\/p>\n If you don’t want the self-weight to contribute to the mass for the modal analysis, set When starting the elastic analysis of a model with a dynamic load or when starting a model analysis , the error below appears: Cause 1 The error can be caused by a lack of stiffness\/too many degrees of freedom. The lack of stiffness can be in the cross-sections, the material(s),…<\/p>\n","protected":false},"author":3,"comment_status":"closed","ping_status":"closed","template":"","format":"standard","meta":[],"ht-kb-category":[65],"ht-kb-tag":[],"_links":{"self":[{"href":"https:\/\/support.buildsoft.eu\/es\/wp-json\/wp\/v2\/ht-kb\/4594"}],"collection":[{"href":"https:\/\/support.buildsoft.eu\/es\/wp-json\/wp\/v2\/ht-kb"}],"about":[{"href":"https:\/\/support.buildsoft.eu\/es\/wp-json\/wp\/v2\/types\/ht_kb"}],"author":[{"embeddable":true,"href":"https:\/\/support.buildsoft.eu\/es\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/support.buildsoft.eu\/es\/wp-json\/wp\/v2\/comments?post=4594"}],"version-history":[{"count":3,"href":"https:\/\/support.buildsoft.eu\/es\/wp-json\/wp\/v2\/ht-kb\/4594\/revisions"}],"predecessor-version":[{"id":19090,"href":"https:\/\/support.buildsoft.eu\/es\/wp-json\/wp\/v2\/ht-kb\/4594\/revisions\/19090"}],"wp:attachment":[{"href":"https:\/\/support.buildsoft.eu\/es\/wp-json\/wp\/v2\/media?parent=4594"}],"wp:term":[{"taxonomy":"ht_kb_category","embeddable":true,"href":"https:\/\/support.buildsoft.eu\/es\/wp-json\/wp\/v2\/ht-kb-category?post=4594"},{"taxonomy":"ht_kb_tag","embeddable":true,"href":"https:\/\/support.buildsoft.eu\/es\/wp-json\/wp\/v2\/ht-kb-tag?post=4594"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}\n
\nSo what you could do, is ask less eigen frequencies. The minimum is 2.<\/li>\n<\/ul>\nCause 2<\/h2>\n \t\t
\r\n \t\t\t \t\t\t \t\t\t\t\n
Cause 3<\/h2>\n
\n
\n2 structures are independent if there is no connection between them. For example: the column and the porch below are not connected to each other, thus independant. It is better to make one Diamonds-file for each structure if you want to do a modal analysis for them.
\n![\"\"](\"https:\/\/buildsoftsupport.com\/wp-content\/uploads\/2019\/09\/IndependentStructures-1024x704.png\")
<\/li>\n<\/ul>\nCause 4<\/h2>\n
\n
\n![\"\"](\"https:\/\/support.buildsoft.eu\/wp-content\/uploads\/2019\/09\/ErrorSystemMathSign2.png\")
<\/li>\n<\/ul>\nCause 5<\/h2>\n
\n
![\"\varphi\"](\"https:\/\/support.buildsoft.eu\/wp-content\/ql-cache\/quicklatex.com-ea4b44819badec53f472a0cf6b6c8164_l3.png\" "\\"Rendered")
equal to zero for the self-weight.<\/li>\n![\"\Psi_2\"](\"https:\/\/support.buildsoft.eu\/wp-content\/ql-cache\/quicklatex.com-46541b515110641e40619ef1c181c81e_l3.png\" "\\"Rendered")
equal to zero for the self-weight either<\/li>\n<\/ul>\n to 1 and to a low value (like 0,01). Or set the material density to a low value (like 0.001kg\/m\u00b3).<\/p>\n","protected":false},"excerpt":{"rendered":"