Learning Forum

[mertturgut.senol]

Dear all experts;

there is someting confusing me regarding pinned boundary condition.

In pinned conection displacements will be zero but rotations will be free. In fixed boundary conditions both displacements and rotations are zero.

In an example like skown below when I use remote displacement as X,Y,Z are zero and Rot X,Y,Z are free I cannot get any solution. I got solver pivot error.

At point C I am using displacement as X direction free. When I use fixed support at point A I can get solution or If I set Rot X as zero I can get solution.

 

For roller Can I use"simply supported" boundary condition or use displacement boundary condition by making one direction free?

For these boundary conditions both pinned and roller what do you suggest?

 

Thank you for your advice and comments.

 

[Erik Kostson]

 

 

Hi

For roller Can I use”simply supported” boundary condition or use displacement boundary condition by making one direction free?

I would use Y = 0 (perhaps Z=0), assuming Y is along the height and X along the length of the beam (so use displacement boundary condition).

For the other one use X=Y=Z = 0 on an edge (so fixed support on that edge as shown below in the video).

See video here:

 

https://www.youtube.com/watch?v=CTi1ru-pfi0

 

Erik

 

 

 

[mertturgut.senol]

I thank you Erik, for your valuable suggestion

[mertturgut.senol]

For pinned support I used simply support and for roller support I used remote displacement and for remote displacement I adjusted two displacement axes as zero and one rotation axis as zero. 

When I adjust the boundary condition I can get more accurate results according to hand calculation and results solved by 3D models.

Best regards.