# Shell Element contraint **URL:** \ **Category:** General Questions\ **Created:** [April 17, 2023, 6:15am UTC](https://prepomax.discourse.group/t/shell-element-contraint/828 "2023-04-17T06:15:06Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Agazzotti](https://avatars.discourse-cdn.com/v4/letter/a/3da27b/32.png) [@Agazzotti](https://prepomax.discourse.group/u/Agazzotti)\ **Post date:** [April 17, 2023, 6:15am UTC](https://prepomax.discourse.group/t/shell-element-contraint/828/1 "2023-04-17T06:15:06Z")
Good Morning I hava an issue with the brick element in the link. I would like to run the simulation with the edges(“vertical” ones) constrainted with each other but, even though I insert all the Tie constraints from the menu, when I reach the simulation results the part is untied. I can’t figure out how to solve this issue since follwing the same steps with brick elements it works. The element is imported from an iges file. Thank you for your attention. [WeTransfer - Send Large Files & Share Photos Online - Up to 2GB Free](https://we.tl/t-r9N7AaPrko)]([WeTransfer - Send Large Files & Share Photos Online - Up to 2GB Free](https://we.tl/t-r9N7AaPrko?utm_campaign=TRN_TDL_05&utm_source=sendgrid&utm_medium=email&trk=TRN_TDL_05) ---
**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\ **Post date:** [April 17, 2023, 7:51am UTC](https://prepomax.discourse.group/t/shell-element-contraint/828/2 "2023-04-17T07:51:41Z")
In this case, I would definitely recommend creating a compound part from those separate shell parts. Then you won’t need tie constraints. But you may need this workaround when using IGES files (STEP is much better by the way): [Compound part from IGES surfaces is empty](https://prepomax.discourse.group/t/compound-part-from-iges-surfaces-is-empty/156)