shear lag

[faroq]

hi
please help me
I'd consider the effect of shear lag in T-shaped shear walls. But I don't know how to model it in opensees.

[Ameri]

Hi,

Actually I didn't get what you mean! Shear Lag is a phenomenon that happens only when it exists (such as in frame-tube systems in tall buildings). I think this is not a specific characteristic that you impose to your model. So you should use conventional modeling methods, and you will see shear lag in your model just when it occurs. Then you can devise a solution to reduce effects of this phenomenon (by using bundled tube or belt trusses for example).

[alish]

hi

thank's a lot dear.Ameri for your valuable tips.
I think found my answer! If i simulate my shear wall model with shell element's,this elements automatically distributes stress properly; thus shear lag occurs where it should take place.

well, is this true? Would you agree with this idea?

[Ameri]

Hi,

My pleasure. According to my previous post, if your model is appropriate and you have nothing mistaken in it, you will see an almost real stress distribution in all structural elements (I say "almost" since FEM has approximations). So if shear lag happens, you'll see it. And if it doesn't occur, you won't see this phenomenon.

Good luck