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EC wind Cpnett andCf - need a help.

EC wind Cpnett andCf - need a help.

EC wind Cpnett andCf - need a help.

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 use cpnett, where i use Cf.

In attachment You can find a picture of construction.

Thanks for your help.  

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