To: <seaint@seaint.org>
Subject: Rigid diaphragm with framed shear walls and concrete shear walls
Jeff,
I have not done combined concrete shear walls with light gage steel
shear walls, but your results sound reasonable. I agree with Gerard
that it does not sound like a good idea due to the extreme difference in
rigidities.
I have done several buildings combining reinforced masonry shear walls
with concrete basement walls and wind up with a similar problem. One
suggestion that I have is to put some vertical joints in the concrete
wall to make into shorter less stiff sections. For a wall of that
length you probably need some joints anyway. Just detail them such that
no shear or moment can transfer across the joint.
Alternatively, can you find a way to keep the diaphragm from imparting
any load into the concrete wall. This would allow you to use only the
light gage steel walls.
--
Adam Vakiener, P.E.
Structural Engineer
Southern A&E, LLC
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