2D beam element – stiffness matrix

- November 1, 2021 at 10:09 am
  
  EmilieKongstad
  Subscriber
  
  Hello,
  
  I would like to model a 2D beam element with 3 DOF in each node (horizontal and vertical displacement and rotation). My model consists of 1 element and 2 nodes.
  Ansys seems to model the beam element in 3D with 6 DOF in each node as seen by the 12by12 stiffness matrix as attached (Ansys stiffness matrix).
  2d element stiffness matrix.png
- November 1, 2021 at 10:28 am
  
  Surya Prakash
  Ansys Employee
  
  As per the guidelines, we are not allowed to download any files, can you upload the images by clicking on the image option rather than attaching the files?
  
  Also in order to perform a 2D analysis, select geometry, go to properties tab>advanced geometry options>analysis type, change it to 2D.
  
  Regards
  Surya
- November 1, 2021 at 1:29 pm
  
  EmilieKongstad
  Subscriber
  
  Hi Surya
  Is it possible to obtain a stiffness matrix from Ansys (12by12) as the 6by6?
- November 2, 2021 at 7:11 am
  
  Surya Prakash
  Ansys Employee
  
  Performing a 2D analysis will help you obtain the 6X6 stiffness matrix. The steps on how to perform them is mentioned in the previous comment.
  
  Thanks Surya