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#73808 - 09/20/19 12:00 PM What is Vector1, Vector2... in the Displacement input?
Tom45 Offline
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Registered: 11/12/14
Posts: 10
Loc: Canada
What does the Vector1, Vector2, ... Vector 9 represent in the Displacement input screen?

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#73809 - 09/20/19 02:41 PM Re: What is Vector1, Vector2... in the Displacement input? [Re: Tom45]
Michael_Fletcher Offline
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Registered: 01/29/10
Posts: 816
Loc: Louisiana, US
You can specify the displacement of a given node on a given element up to 9 different ways. Then you specify when those displacements apply in the load case editor as D1, D2... D9.

Same applies to point loads, F1... F9 and distributed loads, U1... U9.

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#73818 - 09/23/19 10:29 AM Re: What is Vector1, Vector2... in the Displacement input? [Re: Tom45]
anubis512 Offline
Member

Registered: 08/24/18
Posts: 80
Loc: USA
To add onto the answer above, these are external displacements your piping is seeing in the directions you defined in the vector.

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#74165 - 11/14/19 06:46 PM Re: What is Vector1, Vector2... in the Displacement input? [Re: Tom45]
Tom45 Offline
Member

Registered: 11/12/14
Posts: 10
Loc: Canada
I understand displacements but why call it Vector 1, Vector2 etc.

Is there some significance that I am missing as to why it is called that??

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#74166 - 11/14/19 06:57 PM Re: What is Vector1, Vector2... in the Displacement input? [Re: Tom45]
Faizal K Offline
Member

Registered: 07/21/08
Posts: 159
Loc: USA/Malaysia
CAESAR II is just allowing you to define up to 9 sets (vectors) of displacements.

Let's say your line is tied to a much larger header having multiple operating modes. Say case 1, the header goes +1" in the X direction. Case 2 it goes to -1" X and +1" Z. You can define D1 = {1,0,0,0,0,0}*, D2 = {-1,0,1,0,0,0}*. D1 is displacement vector 1, D2 = displacement vector 2 etc.

In your load case setup, you can even combine them too if you want.



*{DX, DY, DZ, RX, RY, RZ}

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#74167 - 11/14/19 06:59 PM Re: What is Vector1, Vector2... in the Displacement input? [Re: Tom45]
Faizal K Offline
Member

Registered: 07/21/08
Posts: 159
Loc: USA/Malaysia
also, displacement is a vector since you have magnitude and direction. just like the force input.

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#74178 - 11/15/19 10:01 AM Re: What is Vector1, Vector2... in the Displacement input? [Re: Tom45]
Michael_Fletcher Offline
Member

Registered: 01/29/10
Posts: 816
Loc: Louisiana, US
An additional note. You might be tempted to say D1 = {1,0,0,0,0,0} and D2 = {0,0,1,0,0,0} thus D1+D2 = {1,0,1,0,0,0} but this would be incorrect.

I think CAESAR averages the 2? D1+D2 = {0.5, 0, 0.5, 0, 0, 0}.

(Or it could also do SRSS - I just don't remember.)

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