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Re: Shearwall Foundation (max. flex. bending)

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Casey,
 
I hope you are not reading too deep into the problem, such walls and footings are being (and have been for a long time) designed and proven to be earthquake resistant. 
 
In any case, considering the rigidity of the wall and the obvious shear connection between the wall and the footing, how can the even a higher moment between B and C govern the footing design?
 
If you wish - or have spare time - you can design the footing as a beam on elastic foundation by hand.  You can also easily model the problem in practically any FEA program with one-way/spring support capability.  If your results would show maximum moment not around grid B, they are likely to defy years of practical experience by thousands of engineers, and, therefore, to point to some defect in the model.
 
Steve Gordin SE
Irvine CA
 
 
 
 
 
----- Original Message -----
Sent: Thursday, May 04, 2006 2:37 PM
Subject: Shearwall Foundation (max. flex. bending)

I'd like to know what would you do in order to find the location of the maximum flexural bending in the footing of a concrete shearwall.

Click her to see the figure: http://h1.ripway.com/SEAINT/Shearwall_FDN.pdf

 

As an approximation, one can assume that this location is under line B (under the edge of the shearwall).

But in reality, depending on the wall and foundation characteristics, this location can be anywhere between lines B and C (under the shearwall) which can be calculated.

In order to calculate this location, you need to check the flexural bending in various sections under the wall and pick the max.

 

What is your experience in this regard?
Do you know a good reference showing this or an alternative procedure to find the location of Max. flexural bending?

 

Thanks in advance

Casey (Khashayar) Hemmatyar, PE

California