{"id":392885,"date":"2024-11-06T04:09:58","date_gmt":"2024-11-06T04:09:58","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/392885\/"},"modified":"2024-11-06T04:09:58","modified_gmt":"2024-11-06T04:09:58","slug":"392885","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/392885\/","title":{"rendered":"Reply To: Prescribed motion set_ displacement"},"content":{"rendered":"<p>&lt;p&gt;Hi Pedram,&lt;\/p&gt;&lt;p&gt;Thank you so much for your answer and help.&lt;\/p&gt;&lt;p&gt;Let me upload the photo of my soil column model here:&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/06-11-2024-1730863433-Presentation1.jpg\" alt=\"\" \/>&lt;\/p&gt;&lt;p&gt;As you can see, here is my soil column model.&lt;\/p&gt;&lt;p&gt;I am using 67 hexahedral solid elements with element type 1 (no rotation get recorded) on top of each other. I am fixing base in z direction.&nbsp;&lt;\/p&gt;&lt;p&gt;I am constraining the nodes (CONSTRAINED_NODE_SET) at each elevation to have the same response in x, y, and z direction (except the nodes at the base which are constrained in x and y directions). I am doing so to have pure shear behavior (periodic boundary condition mentioned in the first reference you mentioned).&lt;\/p&gt;&lt;p&gt;Then I apply PRESCRIBED_MOTION_SET as dispalcement to the nodes at the base.&lt;\/p&gt;&lt;p&gt;When I check the acceleration response at the base nodes, I see considerable big numbers. And I am not getting what is wrong. The records at the other elevations look fine since I verified them using OpenSees.&lt;\/p&gt;&lt;p&gt;Also, when I use velocity as my input motion, I do not see such problem. I am just looking for the reason that dispclement has such problem.&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;Thanks&lt;\/p&gt;&lt;p&gt;Mostafa&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-392885","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hi Pedram,Thank you so much for your answer and help.Let me upload the photo of my soil column model here:As you can see, here is my soil column model.I am using 67 hexahedral solid elements with element type 1 (no rotation get recorded) on top of each other. I am fixing base in z direction. 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