Anchor Restraint On Flanges (Caesar II) 5

[Timeyin]

Hi everyone,
I've been going through some Caesar II model to profound solution(s) to the failing pipe.
Going through most of the existing models I noticed that an anchor type restraint was placed in-between connecting weld neck flanges. This was repetitive in all the models I checked.
Generally whenever I'm modelling with Caesar II, I only use the anchor type restraint at connection points (connections to equipment etc).
My question now is, when do we use anchor restraints?
Is it typical to place a restraint in-between two connecting flanges?

 

[C2it]

Surely this is quite simple.

As big Inch says, and as Pennpiper's picture shows, anchor flanges do exist ... similar to a pair of weld neck flanges. Not used much, and IMHO of very dubious ability in controlling rotations.

As Timeyin says in his 15 Jul 14 5:26 post, the 'anchor' in his case is connected to the adjacent node, not to ground. Ergo ... it is not an real anchor which by definition would restrain translations and rotations to ground. It is only a stress engineer's quick route to important data.

 

[Timeyin]

@saplanti... see attached isometrics for your info.

C2it was right when he said ..."An 'anchor' is defined at the flange face, but not connected to ground, instead connected to the adjacent element with a Cnode. The internal loads then appear in the 'Restraints Summary' like other anchors. The Cnode is defined in the relevant Restraints input data and the next element connects numerically to it, rather than the preceding element node..."

 

[BigInch]

Pipelines use anchor flanges quite a lot.
Embed an anchor flange in concrete and try to turn it.
In any case, torsion loads usually do not amount to much in most piping systems, but you can weld hooks or large concrete reinforcing bars onto the flanges before you embed them in the concrete, should you have doubts as to its rotational stiffness.

you must get smarter than the software you're using.

 

[saplanti]

I guess the discussion is over with this isometric image. There is no anchor flange, and C2it is correct with his explanation on the model.
Pennpiper and Biginch provided the answer to the question "when do we use anchor restraints?".

Timeyin, I guess you have got your answers all above. Please let us know if you still have doubts.

 

[Timeyin]

Saplanti, there are no doubts anymore.
I got much more than I asked.
Thanks guys.....