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Re: Basement wall seismic

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My understanding is, that with the '09 IBC/'10 CBC you need to consider 
earthquake forces on retaining walls unless the soils report says they can 
be ignored. I'm not sure about the formulas in your email, I use RetainPro 
which addresses the seismic forces in the program.


Larry Hauer, S.E.

-----Original Message-----
> From: Will Haynes <gtg740p(--nospam--at)>
> Sent: Apr 27, 2013 6:25 PM
> To: seaint-seaosc(--nospam--at)
> Subject: [SEAINT-SEAOSC] Basement wall seismic
> For basement walls, ΔPE = kh*γ*H^2 gives the force from EQ on a
> non-yielding wall.
> I am in SDC B with up to 17 ft tall basement walls. In IBC 2006, I don't
> see where you are allowed to ignore seismic on any retaining walls based 
> on being in a lower SDC. I was going use Kh=SDS/2.5 for the design, but I
> wanted to verify this would give the resulting EQ force on the wall at
> strength level?
> Will H

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