Wind Load - Canopie roof
Wind Load - Canopie roof
(OP)
Hello Everybody.
In EC 1991-1-4 for canopie (7.3 chapter) we have coefficients Cpnett and over force coefficients Cf moreover we have 4 pictures with roof and forces.
I do not know when i Should use Cpnett and when Cf.
(As chapter 5.3 says -> Fw=CsCd*q_p(ze)*Cf*Areff)
So here we use Cf but i dont see this force on construction... I have purlins,griders and roof - where i should use cpnett, and where Cf.
Maybe as 1st i must calculation Cpnettm after that use Cf and total wind force use to calculation griders?
Have no idea, maybe someone can give me some links to wokred example - canopie roof.
Thanks for your help
Thanks for your help.
In EC 1991-1-4 for canopie (7.3 chapter) we have coefficients Cpnett and over force coefficients Cf moreover we have 4 pictures with roof and forces.
I do not know when i Should use Cpnett and when Cf.
(As chapter 5.3 says -> Fw=CsCd*q_p(ze)*Cf*Areff)
So here we use Cf but i dont see this force on construction... I have purlins,griders and roof - where i should use cpnett, and where Cf.
Maybe as 1st i must calculation Cpnettm after that use Cf and total wind force use to calculation griders?
Have no idea, maybe someone can give me some links to wokred example - canopie roof.
Thanks for your help
Thanks for your help.





RE: Wind Load - Canopie roof
RE: Wind Load - Canopie roof
RE: Wind Load - Canopie roof
http://w
www.bgstru
RE: Wind Load - Canopie roof
RE: Wind Load - Canopie roof
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Wind Load - Canopie roof
RE: Wind Load - Canopie roof
Just the only one problem now is that: should i use cpnett only to cladding and steel construction calculate by using Force - and Cf coefficient.
But as i see it depends on you want to precisely calculate or not .
Thanks all of you for help.
RE: Wind Load - Canopie roof
RE: Wind Load - Canopie roof
Thank you Ron for your interest my thread.
(Thanks to all of you who answered)
RE: Wind Load - Canopie roof
RE: Wind Load - Canopie roof
Moreover :
For a monopitch canopy the center of pressure should be taken at d/4 from the windward edge : d = alongwind dimension,
Where Fw=CsCd * qz * Cf * Aref
And what Aref should be ( area of beams? rafters etc? or surface where we have cladding (much bigger than area of beams) - in some books i have seen Aref as a whole surface where we use claddings -> when we have repating frames where exactly put the Force ( in d/4)
(in AISC 7 is : F= qZ G Cf Af (N))
The overall force coefficient represents the resulting force. The net pressure coefficient represents the maximum local pressure for all wind directions. It should be used in the design of roofing elements and fixings.
So if i calculate whole construction using Cpnett -> it's save choice .( using Fw force it's better choice, beacuse we have smaller loads on cinstruction = Cf coeff is smaller than Cpnet)
Sum Up:
Cpnet for cladding -> and if i have a lot of money (joke) i can use those coefficients to calculate frame and rest of construction.
But the best choice is :
Cladding calculate -> use Cpnet
Frame Construction -> Use Fw (with Cf coeff) and Aref is then surface bettwen two repeating frames.