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Re: Flat Plate in Seismic Zone 4

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According to UBC97, I believe you have to design it as a shear wall
building frame system with Rw=5.5 since there is no "moment resisting
frame" to speak of.

"M. A. Mufti" wrote:

> 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