{"id":164437,"date":"2021-11-30T13:52:38","date_gmt":"2021-11-30T13:52:38","guid":{"rendered":"\/forum\/forums\/topic\/how-do-i-set-the-combin39-element-as-a-2d-longitudinal-spring-to-model-a-shear-connection\/"},"modified":"2021-12-06T22:32:20","modified_gmt":"2021-12-06T22:32:20","slug":"how-do-i-set-the-combin39-element-as-a-2d-longitudinal-spring-to-model-a-shear-connection","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-do-i-set-the-combin39-element-as-a-2d-longitudinal-spring-to-model-a-shear-connection\/","title":{"rendered":"How do I set the COMBIN39-element as a 2D-longitudinal spring to model a shear connection?"},"content":{"rendered":"<div class=\"Item-Body\">\n<div class=\"Message userContent\">\n<p>Hi,<\/p>\n<p>I&#039;m trying to model a concrete-steel composite structure. The interface \/ shear connection between concrete and steel is realized through shear studs, which should be represented as spring elements in my analysis. The idea is to use the COMBIN39 element with KEYOPT(4) set to 3 (2D-longitudinal spring). I chose the 2D option because I will most likely have forces acting in various directions in the interface-plane and thus need an element that is able to capture the &quot;resulting&quot; force (instead of having two separate springs in x- and y-direction of the base plane). This is especially important since the springs will have a sliding force that also should refer to the resulting force.<\/p>\n<p>I did a simple test model in Mechanical and managed to manually change my spring connections to COMBIN39 and setting the relevant KEYOPTs. Springs also work fine in the main direction (connection line between the nodes, aligned with global x) but I don&#039;t get them to work in the transversal direction (global y in my case), there seems to be no stiffness activated when I apply the loads. <\/p>\n<p>The COMBIN30 description states that for the 2D-longitudinal element, the &quot;element must lie in an X-Y plane&quot;. Is that referred to an element coordinate system, or does this special option require a global X-Y plane \/ 2D-analysis?<\/p>\n<p>Any thoughts\/ideas on that would be highly appreciated.<\/p>\n","protected":false},"template":"","class_list":["post-164437","topic","type-topic","status-closed","hentry","topic-tag-ansys-mechanical","topic-tag-ansys-workbench","topic-tag-spring","topic-tag-static-structural","topic-tag-structural"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_author_ip":[""],"_bbp_old_reply_author_name_id":["Anonymous"],"_bbp_old_is_reply_anonymous_id":["false"],"_btv_view_count":["1125"],"_bbp_likes_count":["0"],"_bbp_subscription":["241928"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["164437"],"_bbp_forum_id":["27791"],"_bbp_engagement":["14","241928"],"_bbp_voice_count":["2"],"_bbp_reply_count":["4"],"_bbp_last_reply_id":["199162"],"_bbp_last_active_id":["199162"],"_bbp_last_active_time":["2021-12-06 22:32:20"]},"test":"fe6awjnnposteo-de"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/164437","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\/164437\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=164437"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}