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Re: Rigid diaphragm with framed shear walls and concrete shear

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From: "Jeff Hedman" <jeff_h(--nospam--at)>
To: <seaint(--nospam--at)>
Subject: Rigid diaphragm with framed shear walls and concrete shear walls


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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