hi

when modeling a restraint guide (support) with 5 mm gap, this mean that the line can move 5 or 10 mm? is that it can move more??

REGARDS

5mm on each side. (So the total range would be 10mm.)

thank you Mr richard


can it the total displacement 10 mm in one direction ,for example X or -X ?.

regards

No, not if you put a 5mm gap on an X restraint. This would be 5mm on each side.

If you want a gap on a directional restraint (say -10mm in -X), then you would specify a +X with gap =10mm. This means the pipe is free to move in the +X direction, and it will be restrained in the -X after it closes the 10mm gap.

This is all in the Manuals ...

... That is, unless you are looking at a range calculation (e.g. L1-L2) in which case you can double (L1=-5 & L2=+5).

thank you

I know all that is in the books, and despite that I think there is a problem in the modeling of restraint

I put restraint guide with 5 mm gap and i found in displacement -10 mm means that the line has moved 10 mm from its initial position when it has no right to translate than 5mm in one direction.

please, how can we explain this problem?


best regards

Read what I posted. Again.
And by the way, congratulations on you country's elections today.

taoufikessouda,

It can be expalined in two ways.
(1)

(a) if you provided 5 mm gap in restraint X , this would be 5 mm in +x direction and 5 mm in -X direction.hence allowing pipe to move 5 mm both sides freely.

further more no external restarint loads will act on pipe within 5 mm dispalcement of pipe on both sides.

(b) if you would like to have 5 mm in only one direction ( +x or -X ) you can provide as follows

+x , 5 mm gap
-X , 0 mm gap
It allows pipe to move 5 mm in +x direction and restricts dispalcement in -X direction.

(2) If you put 5 mm gap in any restraint , that does not mean pipe shall be restricted upto 5 mm displacement from its initial position.

i.e Pipe is allowed to move 5 mm freely from its initial position (without any external restraint loads in particular direction).any further displacement should undergo for restraint loads.

if you have any further queries please come back to forum

Regards

Just remember that for combined load cases, root cases added or subtracted, the disp shown is relative to the other. For example OPE + WIND, the pipe may have moved -4mm X (OPE) then the wind blows the pipe to contact the opposite guide, thus will yield a 9mm X disp, but is still within the guides. Draw some pictures and look at what the load case actually is.

thank you for all



thank you Dave Diehl



REGARDS

You can also study the Mr. Loren Brown webinar:

http://coade.typepad.com/coadeinsider/2010/06/caesar-ii-webinar-load-case-editor.html