{"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\/nl\/knowledge-base\/how-many-hinges-do-i-need\/","title":{"rendered":"How many hinges do I need?"},"content":{"rendered":"<p>&#8220;A hinge&#8221; 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 &#8220;hinge&#8221; or &#8220;joint&#8221;.<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 &#8220;hinge line&#8221;.<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&#8217;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&#8217;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&#8217;t contain a hinge) can&#8217;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>&#8220;A hinge&#8221; 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 &#8220;hinge&#8221; or &#8220;joint&#8221;. 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\/nl\/wp-json\/wp\/v2\/ht-kb\/13775"}],"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=13775"}],"version-history":[{"count":3,"href":"https:\/\/support.buildsoft.eu\/nl\/wp-json\/wp\/v2\/ht-kb\/13775\/revisions"}],"predecessor-version":[{"id":14272,"href":"https:\/\/support.buildsoft.eu\/nl\/wp-json\/wp\/v2\/ht-kb\/13775\/revisions\/14272"}],"wp:attachment":[{"href":"https:\/\/support.buildsoft.eu\/nl\/wp-json\/wp\/v2\/media?parent=13775"}],"wp:term":[{"taxonomy":"ht_kb_category","embeddable":true,"href":"https:\/\/support.buildsoft.eu\/nl\/wp-json\/wp\/v2\/ht-kb-category?post=13775"},{"taxonomy":"ht_kb_tag","embeddable":true,"href":"https:\/\/support.buildsoft.eu\/nl\/wp-json\/wp\/v2\/ht-kb-tag?post=13775"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}