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Fwd: [Q] Plastic Deformation in a diaphragm

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in a low-rise (5 levels) 72.0 m x 48.0 m - 
RC-structure, I am considering to let plastic
deformations take place in the concrete slab
(diaphragm) aiming to reduce the huge forces
going from the slab into the stiff vertical
RC-core and RC perimeter walls.

In capacity design, diaphragms are usually
treated as rigid members (when compared with 
the stiffness of the vertical members) delivering
horizontal inertia forces into the vertical members.
The latter are usually designed with sufficient 
ductility to allow for the buildup of plastic hinges
at assigned locations.

In my case, however, the wide-extended slab may 
crack and develop plastic deformations.

Do you have experience with a similar problem
or did you ever came across an article dealing
with this problem?

I will appreciate any advice.

Thanks in anticipation,

Peter Rangelow
Deutschherrnufer 29       tel  : + (49-69) 6199-1806
60594 Frankfurt am Main   fax  : + (49-69) 6199-1805  
GERMANY                   rangelow(--nospam--at)

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Subject: [Q] Plastic Deformation in a diaphragm 
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Richard Lewis, P.E.
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