{"id":39635,"date":"2019-12-16T12:26:24","date_gmt":"2019-12-16T12:26:24","guid":{"rendered":"\/forum\/forums\/topic\/buckling-of-truss-eigenvaleues-are-questionable\/"},"modified":"2019-12-16T12:26:24","modified_gmt":"2019-12-16T12:26:24","slug":"buckling-of-truss-eigenvaleues-are-questionable","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/buckling-of-truss-eigenvaleues-are-questionable\/","title":{"rendered":"Buckling of truss, eigenvaleues are questionable"},"content":{"rendered":"<p>Dear ANSYS community,<\/p>\n<p><\/p>\n<p>I have a question about eigenvalues of truss structure. I have modeld my brace out of plates, with thicknes of 6,3mm.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/68b883bb-00b9-421f-baee-aa1200ce66f7\/405bb181-2424-4bce-899d-ab2500c898a4_lem-truss.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p>Forces&nbsp;are 1N in upper chord where braces are connected. Forces&nbsp;are applied in both side of chord.&nbsp;<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/68b883bb-00b9-421f-baee-aa1200ce66f7\/929c804f-200e-4fe8-abae-ab2500c92b20_lem-truss-forces.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p>I am looking to get buckling forces(eigenvalues) of chords and braceses, but unfortunately it seems like plates are buckling before elements &#8211; out of 100 eigenvalue modes there is no clean buckling of brace or chord, every result has somthing like this in it. Upper chord has waves in it.&nbsp;<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/68b883bb-00b9-421f-baee-aa1200ce66f7\/618f9a10-f20c-47fd-a59c-ab2500cb2809_lem-truss-eigenvalue.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p>Could anybody help me to understand, how to get only brace or chord buckling values?&nbsp;<\/p>\n<p><\/p>\n<p>You will be appreciated.&nbsp;<\/p>\n<p><\/p>\n<p>Sander&nbsp;<\/p>\n","protected":false},"template":"","class_list":["post-39635","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["11814"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":[null],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0"],"_btv_view_count":["300"],"_bbp_subscription":["239416"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["39635"],"_bbp_forum_id":["27791"],"_bbp_engagement":["163510"],"_bbp_voice_count":["1"],"_bbp_reply_count":["0"],"_bbp_last_reply_id":["0"],"_bbp_last_active_id":["39635"],"_bbp_last_active_time":["2019-12-16 12:26:24"]},"test":"nokunaator"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/39635","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/39635\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=39635"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}