{"id":309566,"date":"2023-10-01T03:46:23","date_gmt":"2023-10-01T03:46:23","guid":{"rendered":"\/forum\/forums\/topic\/apply-rotational-stiffness-to-a-base\/"},"modified":"2023-10-01T03:46:23","modified_gmt":"2023-10-01T03:46:23","slug":"apply-rotational-stiffness-to-a-base","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/apply-rotational-stiffness-to-a-base\/","title":{"rendered":"Apply rotational stiffness to a base"},"content":{"rendered":"<p>I have a concrete block made up of SOLID elements. I am currently applying a spring at the base at each mesh element but I found I also want to apply rotation stiffness to the entire foundation. I have a single value of the stiffness of the system in each direction including rotation stiffness. Before knowing I need to apply rotational stiffness, I took the total value of stiffness in each translation direction and applied a portion of this to each node based on its tributary area. However I also now need to apply rotation stiffness to the entire system so I think this approach will not work.<\/p>\n<p>SOLID nodes dont have rotation DOF, so I was thinking I would create a master node and assign it a single spring with x,y,z,rotx,roty,rotz and then connect this node with all my base nodes. This would distribute the stiffness to the nodes and allow the system to rotate with a certain stiffness.<\/p>\n<ul>\n<li>Can I perform this without tying all base nodes (X,Y,Z)? My behavior is most likely rigid but I was wondering if its possible. I dont think its possible but please correct me if im wrong<\/li>\n<li>If its not possible, can I make my base like a rigid plate (X,Y) direction but also able to rotate around the master node with a certain stiffness (around x,y).<\/li>\n<\/ul>\n","protected":false},"template":"","class_list":["post-309566","topic","type-topic","status-closed","hentry","topic-tag-ansys-apdl","topic-tag-ansys-mechanical","topic-tag-apdl","topic-tag-constraints"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"I have a concrete block made up of SOLID elements. I am currently applying a spring at the base at each mesh element but I found I also want to apply rotation stiffness to the entire foundation. I have a single value of the stiffness of the system in each direction including rotation stiffness. 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