×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Modelling a floating roof

Modelling a floating roof

Modelling a floating roof

(OP)
Hy everyone!

I'm a beginner in using FEA, so please anyone help me with the following task: "to find the stresses in the roof plates on the supporting legs condition."  

I'm trying to model a floating roof having a diameter of 22725 mm. It is also supported by 90 pieces of 4"OD pipes with reinforcing pads. The roof plates are 5 mm thickness.
I tried to model the roof with SHELL181 elements and the legs with pipe beams. When I run the aplication I receive the following message:
  
"The value of UY at node 5308 is 2.169...E+10. It is greater than the curent limit of 1000000.This generally indicates rigid body motion as a result of an unconstrained model. Verify that your model is properly constrained."

This node is somewhere in the middle of a plate.I modelled the whole roof.I anchored the legs at the base.
I don't know what to do next to solve the problem.
Any help will be very appreciated.

Dan

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources