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#26992
-
04/28/09
07:08 AM
Multiple Wind Load Cases
evansm
Member
Registered: 03/19/09
Posts: 1
Loc: Corpus Christi, TX
Is it possible to run more than 4 wind load cases in a single model? I need to apply 1, 10, 100 year wind conditions, and Blast loading, in combination with acceleration loads. Thanks
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#27009
-
04/28/09
01:03 PM
Re: Multiple Wind Load Cases
[
Re: evansm
]
mariantrifan
Member
Registered: 02/04/08
Posts: 73
Loc: Nederland
Why you want to do something like this in a single model.
For 1 , 10, 100 years you have different velocity of the wind.
For blast No Comment.
Just look for this to see what is hapening if you do something stupid.
http://www.coade.com/ubbthreads/ubbthrea...=true#Post24059
Some information about blast you can find here:
http://www.civenv.unimelb.edu.au/ejse/Archives/Fulltext/2007/Special/200707.pdf
http://www.orbin.nl/presentations/OTC%202004%20paper%2016058.pdf
http://www.fabig.com/NR/rdonlyres/BDD27B...hnicalNote4.pdf
_________________________
Marian
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#27161
-
05/05/09
04:31 AM
Re: Multiple Wind Load Cases
[
Re: mariantrifan
]
jane_k
Member
Registered: 04/24/08
Posts: 12
Loc: asia
You can add a multiply factor at Load Case Editor instead of in the model itself.
For example, 1 year the wind speed is 20m/s. 10 year is 35m/s.
At the Load Case Editor, use 1.75 WIN 1, for the result of 10 year wind conditon.
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#27168
-
05/05/09
07:29 AM
Re: Multiple Wind Load Cases
[
Re: jane_k
]
Richard Ay
Member
Registered: 12/13/99
Posts: 6226
Loc: Houston, Texas, USA
Be careful with that "muliplier idea", wind loads increase as the square of the wind velocity.
So (35^2)/(20^2) = 3.06 for the multiplier.
_________________________
Regards,
Richard Ay
- Consultant
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#27199
-
05/06/09
02:39 AM
Re: Multiple Wind Load Cases
[
Re: Richard Ay
]
jane_k
Member
Registered: 04/24/08
Posts: 12
Loc: asia
Thanks for reminding Richard.
q= 0,5 * P * v^2
q = wind load
p = density of air
v = velocity
q1 = [ (v1^2)/(v2^2) ] q2
correct?
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#27200
-
05/06/09
04:54 AM
Re: Multiple Wind Load Cases
[
Re: jane_k
]
shrav
Member
Registered: 05/12/08
Posts: 21
Loc: india
for uniform loads,how to load cases??
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#27201
-
05/06/09
04:54 AM
Re: Multiple Wind Load Cases
[
Re: shrav
]
shrav
Member
Registered: 05/12/08
Posts: 21
Loc: india
for uniform loads,how to build load cases in caesarII??
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