{"id":13775,"date":"2024-10-23T07:31:35","date_gmt":"2024-10-23T07:31:35","guid":{"rendered":"https:\/\/support.buildsoft.eu\/?post_type=ht_kb&#038;p=13775"},"modified":"2025-01-15T11:42:17","modified_gmt":"2025-01-15T11:42:17","slug":"how-many-hinges-do-i-need","status":"publish","type":"ht_kb","link":"https:\/\/support.buildsoft.eu\/fr\/knowledge-base\/how-many-hinges-do-i-need\/","title":{"rendered":"How many hinges do I need?"},"content":{"rendered":"<p>\u00ab\u00a0A hinge\u00a0\u00bb is a global name for a <a href=\"https:\/\/support.buildsoft.eu\/knowledge-base\/what-is-the-difference-between-a-support-and-a-boundary-condition\/\" target=\"_blank\" rel=\"noopener\">boundary condition<\/a> which prevents certain internal forces to be transferred among elements themselves.<\/p>\n<ul>\n<li>If the transfer is between two (or more) bar elements, we use the name \u00ab\u00a0hinge\u00a0\u00bb or \u00ab\u00a0joint\u00a0\u00bb.<br \/>\nDefined in Diamond using the button <img decoding=\"async\" loading=\"lazy\" class=\"img_inline alignnone size-full wp-image-1056\" src=\"https:\/\/support.buildsoft.eu\/wp-content\/uploads\/2017\/06\/KnopScharnieren.png\" alt=\"\" width=\"34\" height=\"34\" \/>.<\/li>\n<li>If the transfer is between two (or more) surface element, we often use the name \u00ab\u00a0hinge line\u00a0\u00bb.<br \/>\nDefined in Diamond using the button <img decoding=\"async\" loading=\"lazy\" class=\"img_inline alignnone size-full wp-image-4310\" src=\"https:\/\/support.buildsoft.eu\/wp-content\/uploads\/2019\/06\/KnopRandvoorwaardenPlaatrand.png\" alt=\"\" width=\"36\" height=\"38\" srcset=\"https:\/\/support.buildsoft.eu\/wp-content\/uploads\/2019\/06\/KnopRandvoorwaardenPlaatrand.png 36w, https:\/\/support.buildsoft.eu\/wp-content\/uploads\/2019\/06\/KnopRandvoorwaardenPlaatrand-33x35.png 33w\" sizes=\"(max-width: 36px) 100vw, 36px\" \/>.<\/li>\n<\/ul>\n<p>However, adding to many hinges will result in an arithmetic mechanism. Thus a structure that will not calculate or result in exaggerated deformations. We list the most common mistakes here together with their correct alternative.<\/p>\n<div class=\"su-table\">\n<table border=\"1px\">\n<tbody>\n<tr>\n<th style=\"width: 30%\">BAD<\/th>\n<th style=\"width: 30%\">GOOD<\/th>\n<th style=\"width: 40%\">Why?<\/th>\n<\/tr>\n<tr>\n<td>\u00a0\u00a0<img loading=\"lazy\" class=\"size-large wp-image-13779 aligncenter\" src=\"https:\/\/support.buildsoft.eu\/wp-content\/uploads\/2024\/10\/Hinges1.png\" alt=\"\" width=\"47\" height=\"269\" \/><\/td>\n<td><img loading=\"lazy\" class=\"size-large wp-image-13780 aligncenter\" src=\"https:\/\/support.buildsoft.eu\/wp-content\/uploads\/2024\/10\/Hinges2.png\" alt=\"\" width=\"40\" height=\"267\" \/><\/td>\n<td>A simple support cannot bear moments. By adding an internal hinge, you say that the column cannot transfer bending moment to the support. That&rsquo;s saying the same thing twice. Remove the internal hinge.<\/td>\n<\/tr>\n<tr>\n<td><img loading=\"lazy\" class=\"aligncenter wp-image-13781\" src=\"https:\/\/support.buildsoft.eu\/wp-content\/uploads\/2024\/10\/Hinges3.png\" alt=\"\" width=\"43\" height=\"250\" \/><\/td>\n<td><img loading=\"lazy\" class=\"size-large wp-image-13780 aligncenter\" src=\"https:\/\/support.buildsoft.eu\/wp-content\/uploads\/2024\/10\/Hinges2.png\" alt=\"\" width=\"40\" height=\"267\" \/><\/td>\n<td>A built-in support can bear moments. By adding an internal hinge, you say that the column cannot transfer bending moment to the support. That&rsquo;s saying the opposite thing. Remove the internal hinge and use a simple support.<\/td>\n<\/tr>\n<tr>\n<td><img loading=\"lazy\" class=\"size-full wp-image-13777 aligncenter\" src=\"https:\/\/support.buildsoft.eu\/wp-content\/uploads\/2024\/10\/Hinges4.png\" alt=\"\" width=\"175\" height=\"273\" \/><\/td>\n<td><img loading=\"lazy\" class=\"aligncenter wp-image-13778 size-full\" src=\"https:\/\/support.buildsoft.eu\/wp-content\/uploads\/2024\/10\/Hinges5.png\" alt=\"\" width=\"169\" height=\"263\" \/><\/td>\n<td>A simple support cannot bear moments. A tie rod is a hinged bar by definition (otherwise it cannot function as a tie rod).<br \/>\nIf you anchor a tie rod to the foundation, without any other bars meeting in that node, you should define the support as built-in. Because the simple support + hinged tie rod, is an arithmetic mechanism.<\/td>\n<\/tr>\n<tr>\n<td>\u00a0<img loading=\"lazy\" class=\"alignnone size-large wp-image-13784\" src=\"https:\/\/support.buildsoft.eu\/wp-content\/uploads\/2024\/10\/Hinges6.png\" alt=\"\" width=\"395\" height=\"254\" \/><\/td>\n<td><img loading=\"lazy\" class=\"alignnone size-full wp-image-13783\" src=\"https:\/\/support.buildsoft.eu\/wp-content\/uploads\/2024\/10\/Hinges7.png\" alt=\"\" width=\"419\" height=\"268\" \/><\/td>\n<td>N bars meet in a node (N=4 in this example). Neglect the tie rods, because internally in Diamonds, they will automatically be defined as hinged.<br \/>\nYou want the node to work as hinged (EN: truss, NL: vakwerk),\u00a0 then you should apply a hinge to 3 bars, not all 4. If you apply a hinge to all 4 bars, you create an arithmetic mechanism.<br \/>\nIf bars 1 to 3 contain a hinge, the bending moment in bar 4 (which doesn&rsquo;t contain a hinge) can&rsquo;t go anywhere because every bar around it is hinged.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u00ab\u00a0A hinge\u00a0\u00bb is a global name for a boundary condition which prevents certain internal forces to be transferred among elements themselves. If the transfer is between two (or more) bar elements, we use the name \u00ab\u00a0hinge\u00a0\u00bb or \u00ab\u00a0joint\u00a0\u00bb. Defined in Diamond using the button . If the transfer is between&#8230;<\/p>\n","protected":false},"author":3,"comment_status":"closed","ping_status":"closed","template":"","format":"standard","meta":[],"ht-kb-category":[59],"ht-kb-tag":[1286,1290,1287,227,1291,223,1285,1292,1289],"_links":{"self":[{"href":"https:\/\/support.buildsoft.eu\/fr\/wp-json\/wp\/v2\/ht-kb\/13775"}],"collection":[{"href":"https:\/\/support.buildsoft.eu\/fr\/wp-json\/wp\/v2\/ht-kb"}],"about":[{"href":"https:\/\/support.buildsoft.eu\/fr\/wp-json\/wp\/v2\/types\/ht_kb"}],"author":[{"embeddable":true,"href":"https:\/\/support.buildsoft.eu\/fr\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/support.buildsoft.eu\/fr\/wp-json\/wp\/v2\/comments?post=13775"}],"version-history":[{"count":3,"href":"https:\/\/support.buildsoft.eu\/fr\/wp-json\/wp\/v2\/ht-kb\/13775\/revisions"}],"predecessor-version":[{"id":14272,"href":"https:\/\/support.buildsoft.eu\/fr\/wp-json\/wp\/v2\/ht-kb\/13775\/revisions\/14272"}],"wp:attachment":[{"href":"https:\/\/support.buildsoft.eu\/fr\/wp-json\/wp\/v2\/media?parent=13775"}],"wp:term":[{"taxonomy":"ht_kb_category","embeddable":true,"href":"https:\/\/support.buildsoft.eu\/fr\/wp-json\/wp\/v2\/ht-kb-category?post=13775"},{"taxonomy":"ht_kb_tag","embeddable":true,"href":"https:\/\/support.buildsoft.eu\/fr\/wp-json\/wp\/v2\/ht-kb-tag?post=13775"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}