Stanchion Inputting

Dear everyone,

I want to know if my inputting style is correct for Stanchion on elbow,Sliding with bolt,Adjustable,Pipe type(SEBAP).It is found at node 1000 and 2000.My caesar II version is 5.0. You can check it at the attachments.

Please give me nice suggestions or idea if you have. Thank you in advance.

Don't you have a lead engineer, or someone to advise you at your workplace ?

Our supervisor is in Japan. He is very busy there and maybe he could entertain us next week when he comes back here in Philippines. I can't wait so maybe you could help us.

I have put here at the attachment regarding my inputting at SEBAP.The arrows represents my restraints. I added also the Rx,Rz and Ry restraints to restrict the rotation since it is sliding with bolt,not shown in the attachment. The problem in here is that i cannot input all restraints since there are only four available input boxes in caesar.So one rotation can not be restricted.
Please correct me if I'm wrong with my inputting strategy.

Thank you in advance and more power!

Put the rotational restraint(s) on either (a) the following element or (b) the preceeding element. You can define all 6 degrees of freedom as restrained - 4 on one element, and 2 on another.

I already have solution on how to free the displacement on x axis only.
Since it is sliding with bolt,we can make it anchor and make cnodes then input displacements at cnodes with all zero value except the x axis which is left blank for free motion.Maybe that's the simple solution.

An even simpler way is to skip the restraint/CNODE business and specify displacements at that node. Specify "dy", "dz", "rx", "ry", and "rz" as zero. Leave "dx" blank - it will be free.

Specify "dy", "dz", "rx", "ry", and "rz" as zero. Leave "dx" blank - it will be free.

From the above statement,It means we can direct input at displacement only with neglecting the restraints? its just the same effect?

Yes (generally). A restraint and a displacement both define boundary conditions.

When we make anchor and cnodes at bolt,do we need input the value of gap and Mu? I have little confusion on how to use friction or when to use friction.

No.

Why don't we need to input the friction at anchor?

I have here my inputting strategy in different restraints at the attachments.Please check it out and give us proper inputting guidelines.

Thank you in advance!

An anchor, by definition, allows no movement. With no movement, you can't create friction.

Your restraints look OK. We could quibble about the need for gaps and friction.

The most detailed model may not be the best. I believe you should keep models as simple as possible but still catch an accurate response.

how about if i activate anchor and make cnode and then input all displacement at cnode equal to zero except the axis I want to free. After i run and see the result i found out that there is a movement at cnode.Do i need to activate the friction and put value?

If we put value of gap equal zero,the value of friction should be blank or must be zero also? since there is no displacement.

And if we have value for gap then that's the time to input value for friction since there is displacement?

Is that correct inputting?

You do not present a clear definition of your model for me to respond.

Responce to your post #19795: That CNode would show displacement in the direction that was undefined.

Response to your post #19797: Friction works perpendicular to the restraint direction. Friction on a double-acting restraint (identical to a zero gap restraint) will have an effect if the pipe can move perpendicular to that restraint direction.