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Applying Wind Load to a Continous Stud

Applying Wind Load to a Continous Stud

Applying Wind Load to a Continous Stud

(OP)
If you have a stud (say wood or CFS) that is continuous past the roof level to form the parapet, how are you applying the wind pressure?
The stud is analyzed as an overhang cantilever. Do you apply wind load to then entire stud. Or do you check 3 cases - apply load to the entire length, just the cantilever, just the span. Does your answer change for deflection?

What if the stud was continuous over 3 stories? Are you checking alternate spans or applying a uniform load to the entire stud?

Thanks?

EIT
www.HowToEngineer.com

RE: Applying Wind Load to a Continous Stud

I apply the wall load to the stud portion below the roof and the parapet wind load to the portion above the roof. I will do two separate cases for windward and leeward. My answer does not change for deflection. If the stud has an abnormal backspan or abnormal parapet height, I will check loading on just those spans and use an envelope design between that case and the full wind load.

RE: Applying Wind Load to a Continous Stud

I will look at the type of cladding, geometry and loading before deciding what I need to calculate. Most of the time the higher wind loads on the parapet govern the moments. I will start by checking the parapet alone and the span below the roof alone. If the strength and deflection works for both cases, I move on. Often times when the parapet works, the span below is OK by inspection.

I don't think loading the wall and parapet simultaneously significantly changes the curvature of the stud at the roof level compared to loading the parapet alone. While codes are based on maximum displacement (L/xxx), the curvature of the cladding is what counts. If I am happy with the deflection but need to reduces the L/xxx to satisfy a picky plan checker, I will check the deflection with the wall and parapet simultaneously loaded.

I assume this is only non-bearing walls since most bearing wall systems are platform framed (no continuous studs). If it happens to be a bearing wall, the continuously loaded member may reduce the P-Delta affects.

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