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[ishacon]

Dear All,

Nowadays several builders are opting for special formwork systems like
MIVAN where design concept structurally is of flat plate with load bearing
walls
that also act as shear walls.It appears to be viable in low seismic zone
areas.

Has anyone explored the design constraints of flat plate in multistoreyed
structures
of this type to resist earthquake loads , say in high risk zones areas of IV
& V ?

Can anyone give some references on this and advise of any particular
limitations?

I would appreciate comments from faculty members also please.

Regards,

VP Agarwal
ishacon[AT]bol...

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[ahujavipul]

Dear Mr. Agarwal

Flat plates are here to stay. We just will have to learn to understand their behaviour and detail them accordingly. Of course in this system shear walls should be designed to take 100% shear. However the columns should be designed to take deformation based on the full earthquake force (ie R=1)--deformation compatibility. Load bearing walls (presumably of concrete--I would reserve my comment if its brick for now) should be stressed to no more than about 35% of fck--so their behaviour is predictably ductile (Ref ACI).

Warm regards,

Vipul Ahuja

On Sat, 01 Dec 2007 ishacon[AT]bol... wrote :

Posted via Email