Hello COADE,

I have made a combination load case for OPE+Wind (-/+X & -/+Z, direction), I have subtract it to OPE to get Wind results only, then, create an additional loadcase for maximum displacement for Wind X & Z direction by using MAX comb method. When I check the result at a guided supports having a gap of 1/8", the value was 1/4" so I viewed the output and the value for both side on wind X was added??? Is this not supposed to happen, please clarify why this is happening.

1.W+T1+P1
2.W+P1
3.W+T1+P1+WIN1 (+X)
4.W+T1+P1+WIN2 (-X)
5.W+T1+P1+WIN3 (+Z)
6.W+T1+P1+WIN4 (-Z)
7.L3-L1 (+X)
8.L4-L1 (-X)
9.L5-L1 (+Z)
10.L6-L1 (-Z)
11.L7,L8 (Max Comb Method)
12.L9,L10 (Max Comb Method)
13.L2+L11
14.L2+L12
15.L1-L2

Thanks.

A review of your displacement reports will probably tell the tale.

Lets say in the operating case you're pipe moves in the "+X (south)" direction until stops at the gapped guide, that's +1/8" in the "X".

Then suppose the wind blows and the wind displaces the pipe to the North until it stops at the gapped guide.

The pipe will displace from the South guide 1/8" back to the nuetral point and then another 1/8" to the North guide.

That's a total of 1/4" movement.

Hi Nozzletwister,

I understand that concept and you were right about the displacement at the guide location, but aren't the "Max Comb Method" not supposed to do that?

This method was only to select the max absolute values not add them. Therefore, it should only select the max values at the said location without consideration if it is either negative or positive.

Thanks.

----I stand corrected... the 1/4" movement takes place when wind is applied during operation, 1/8" to south during operating then it moves 1/4" to north when wind is applied.

Thanks for the clarifications...

Cheers!