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RE: Flat Plate in Seismic Zone 4

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Obviously you are using the 1997 UBC.  

You should be meeting the intent of the code.  Don't forget the deformation
compatibility using the 3*Rw/8 and the P-delta effect on the columns.

Harold Sprague

> -----Original Message-----
> From:	M. A. Mufti [SMTP:mam(--nospam--at)]
> Sent:	Wednesday, April 26, 2000 11:08 AM
> To:	seaint(--nospam--at)
> Subject:	Flat Plate in Seismic Zone 4
> I am designing a building in seismic zone 4. The architect has proposed
> a flat plate structure on rc columns with concrete shear walls.
> Of course, dual system is out of the question as UBC and ACI do not
> allow
> flat plate as a lateral force resisting system in zone 4. Can we design
> the structure as a Building Frame System with Rw=8 with shear walls
> taking 100% of seismic force and designing the flat plate system for
> gravity loads and seismic moments induced by deformation compatibility.
> This frame will be designed as Ordinary Moment Resisting Frame without
> detailing for ductility.
> If the above works out well, does it fulfil the intent of the code?
> M. A. Mufti