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RE: Flat Slab / Building Frame System in High Seismic Zones

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1.  There are no seismic zones any longer.  Seismic zones were used as 
triggers for various provisions.  In the current code, seismic design 
categories (SDC) are used to invoke various provisions.

2.  What you are describing would NOT be a dual system.  A dual system 
shares out of plane seismic induced lateral forces.  Permitted systems for 
SDC B through E are listed in ASCE 7, Table 12.14-1.  There is nothing to 
preclude what you are describing, but as you note 100% of the seismic 
forces would need to be resisted by the shear walls, and there are 
limitations on the shear wall systems.

If you are in a SDC A, you can pretty much do anything you want.  But from 
SDC B through E, there are requirements that must be satisfied.

Again, look at the ASCE 7, Table 12.14-1 for the fundamental requirements 
and structural system restrictions.  You will then go to the ACI 318, 
Chapter 21 for the specific details required.

Regards, Harold Sprague

> Date: Wed, 12 Dec 2012 15:57:15 +0500
> From: nadeem2288(--nospam--at)
> Subject: [SEAINT-SEAOSC] Flat Slab / Building Frame System in High 
> Seismic Zones To: seaint-seaosc(--nospam--at)
> As per ACI, Flat slab frame system (slab + columns to make frames in both
> directions) can not be used in high seismic zones except up to moderate
> seismic zone.
> I want to design a building less than 5 stories tall in high seismic zone
> (say zone 3) using flat slab and shear walls i.e. Building Frame System.
> The Building Frame System will take care of 100 % lateral seismic load. I
> will design flat slab and columns for gravity loads and check for
> deflection compatibility (i.e. service Dead + service Live + service
> Seismic loads) and will design shear walls for 100% lateral load.
> Can anybody tell me if there is any code related problem with the above
> stated design approach? Are there any building examples where flat slab
> floors have been used with shear walls using Building Frame System / Dual
> system?

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