ibarua
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Joined: 26 Jan 2003
阿宝sts: 1039
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 发布:2008年12月30日星期二下午59阿宝st subject: Design of flat slab structure in low se |
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30.Dec 2008
The differentiation between 'high' and 'low' seismic regions is entirely subjective. I know that I live in a 'high' seismic zone (zone V), and I would call zone-I as a 'low' seismic zone, with zones II, III & IV coming in between.
Flat slabs are notoriously week in the lateral direction. Therefore, wherever you /your building is located, it would be prudent to have a lateral bracing system to resist lateral forces. The analysis and design of the lateral bracing system would of course depend on the zone you are working in.
Indrajit Barua.
On Tue, 30 Dec 2009 vijaya narayanan wrote :
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Dear Sefians,
I guess there exists a wide spread consensus that flat
slab in the high seismic region are designed to resist
the gravity load along with the lateral drift induced
unbalanced moment only. The entire lateral load is
designed to be resisted by the lateral resisting system
in place.
Now, assuming the flat slab structure is in the low
seismic zone, say in zone 2, the following question
arise,
1)should we differentiate the design philosophies in
the low and high seismic zones??
2)should we design the flat slab for gravity load and
the unbalanced moment only?
3) should we consider the contribution of the slab and
column in the flat slab towards the lateral resistance?
4) how do we decide whether the region is supposed to
be low seismic or high seismic?
5) how good is our seismic zoning, for us to rely on it?
Now that we have a very good understanding about the
design philosophies in the high seismic region we have
to proceed to discussion on low seismic region
Vijaya narayanan
MTech student
IIT Kanpur
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