{"id":3638,"date":"2018-10-24T12:29:01","date_gmt":"2018-10-24T12:29:01","guid":{"rendered":"http:\/\/buildsoftsupport.com\/?post_type=ht_kb&#038;p=3638"},"modified":"2025-09-26T06:43:12","modified_gmt":"2025-09-26T06:43:12","slug":"how-does-the-choice-1st-or-2nd-order-calculation-affect-the-buckling-lengths","status":"publish","type":"ht_kb","link":"https:\/\/support.buildsoft.eu\/nl\/knowledge-base\/how-does-the-choice-1st-or-2nd-order-calculation-affect-the-buckling-lengths\/","title":{"rendered":"How does the choice &#8216;1st or 2nd order calculation&#8217; affect the buckling lengths in steel structures"},"content":{"rendered":"\n<p>There are 3 methods to calculate the buckling lengths:<\/p>\n\n\n\n<ul>\n<li>Non-displaceabable nodes (syn.: non-sway buckling lengths)<\/li>\n\n\n\n<li>Semi-displaceabable nodes<\/li>\n\n\n\n<li>Displaceabable nodes\u00a0(syn.: sway buckling lengths)<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/support.buildsoft.eu\/wp-content\/uploads\/2025\/08\/VensterBerekenKniklengtes.png\"><img decoding=\"async\" loading=\"lazy\" width=\"477\" height=\"636\" src=\"https:\/\/support.buildsoft.eu\/wp-content\/uploads\/2025\/08\/VensterBerekenKniklengtes.png\" alt=\"\" class=\"wp-image-15498\"\/><\/a><\/figure><\/div>\n\n\n<p>The prefered method depends on the sway or non-sway character of the structure and if global imperfections have been taken into account.<\/p>\n\n\n\n<p>The diagram below gives an overview.<\/p>\n\n\n\n<ul>\n<li>The red paths are possible in Diamonds.<\/li>\n\n\n\n<li>Instead of non-sway buckling lengths, you may also use the semi-displaceable nodes as a conservative alternative.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" loading=\"lazy\" width=\"1141\" height=\"693\" src=\"http:\/\/buildsoftsupport.com\/wp-content\/uploads\/2018\/10\/GlobalAnalysisSteel.jpg\" alt=\"\" class=\"wp-image-3775\" srcset=\"https:\/\/support.buildsoft.eu\/wp-content\/uploads\/2018\/10\/GlobalAnalysisSteel.jpg 1141w, https:\/\/support.buildsoft.eu\/wp-content\/uploads\/2018\/10\/GlobalAnalysisSteel-300x182.jpg 300w, https:\/\/support.buildsoft.eu\/wp-content\/uploads\/2018\/10\/GlobalAnalysisSteel-768x466.jpg 768w, https:\/\/support.buildsoft.eu\/wp-content\/uploads\/2018\/10\/GlobalAnalysisSteel-1024x622.jpg 1024w, https:\/\/support.buildsoft.eu\/wp-content\/uploads\/2018\/10\/GlobalAnalysisSteel-50x30.jpg 50w, https:\/\/support.buildsoft.eu\/wp-content\/uploads\/2018\/10\/GlobalAnalysisSteel-60x36.jpg 60w, https:\/\/support.buildsoft.eu\/wp-content\/uploads\/2018\/10\/GlobalAnalysisSteel-35x21.jpg 35w\" sizes=\"(max-width: 1141px) 100vw, 1141px\" \/><\/figure>\n\n\n\n<p>(Source diagram:&nbsp;<em>Krachtswerking, Grondslagen voor het berekenen en toetsen van staalconstructies voor gebouwen volgens Eurocode 0, 1 en 3, H.H. Snijder en H.M.G.M. Steenbergen, Bouwen met staal, 2011, ISBN 978-90-72830-87-6<\/em>)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>There are 3 methods to calculate the buckling lengths: The prefered method depends on the sway or non-sway character of the structure and if global imperfections have been taken into account. The diagram below gives an overview. (Source diagram:&nbsp;Krachtswerking, Grondslagen voor het berekenen en toetsen van staalconstructies voor gebouwen volgens&#8230;<\/p>\n","protected":false},"author":3,"comment_status":"closed","ping_status":"closed","template":"","format":"standard","meta":[],"ht-kb-category":[69],"ht-kb-tag":[724,722,723],"_links":{"self":[{"href":"https:\/\/support.buildsoft.eu\/nl\/wp-json\/wp\/v2\/ht-kb\/3638"}],"collection":[{"href":"https:\/\/support.buildsoft.eu\/nl\/wp-json\/wp\/v2\/ht-kb"}],"about":[{"href":"https:\/\/support.buildsoft.eu\/nl\/wp-json\/wp\/v2\/types\/ht_kb"}],"author":[{"embeddable":true,"href":"https:\/\/support.buildsoft.eu\/nl\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/support.buildsoft.eu\/nl\/wp-json\/wp\/v2\/comments?post=3638"}],"version-history":[{"count":3,"href":"https:\/\/support.buildsoft.eu\/nl\/wp-json\/wp\/v2\/ht-kb\/3638\/revisions"}],"predecessor-version":[{"id":18297,"href":"https:\/\/support.buildsoft.eu\/nl\/wp-json\/wp\/v2\/ht-kb\/3638\/revisions\/18297"}],"wp:attachment":[{"href":"https:\/\/support.buildsoft.eu\/nl\/wp-json\/wp\/v2\/media?parent=3638"}],"wp:term":[{"taxonomy":"ht_kb_category","embeddable":true,"href":"https:\/\/support.buildsoft.eu\/nl\/wp-json\/wp\/v2\/ht-kb-category?post=3638"},{"taxonomy":"ht_kb_tag","embeddable":true,"href":"https:\/\/support.buildsoft.eu\/nl\/wp-json\/wp\/v2\/ht-kb-tag?post=3638"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}