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PostPosted: Thu Apr 24, 2008 3:01 am    Post subject: No Title Reply with quote

ARC
----- Original Message -----
From: <vjkpatil@vsnl.com>
To: <prof.arc@gmail.com>
Sent: Friday, January 23, 2004 11:27 PM
Subject: Bam - BAMBAY


Quote:
I agree with Dr. Jain that new constructions should be made seismically
safe.

One more point which should be noted is sometimes because of the byelaws /
relaxtion of byelaws produce inefficient structural system.

I will give an example, Bombay Municipal Corporation (BMC) permitts
balcony
Quote:
area to be enclosed during the construction by paying a premium to be BMC,
it sound good as instead of people enclosing the balconies later (which is
a
Quote:
common practice in Mumbai) it is done at the stage of design and
construction. But there is a catch the column  should not come out upto
the
Quote:
edge of the balcony, because according to BMC the building line is not the
outer edge of the balcony but the inner edge of the balcony.

The balcony portion even if it is a part of the room has to be designed as
a
Quote:
cantilever and since it is the part of the room there cannot be a beam
running thro from column to column. Now you have a balcony area which is
resting on a cantilever beam and futher the cantilever beams carry a edge
beam. Further to add agony to the structures architects have slab
projecting
Quote:
out by 600 to 750 mm with brickwalls on the edges of these cantilever
chajja
Quote:
projections for the so called ELEVATION_TREATMENT.

Overall now we have a loaded cantilever coming out of the building with
about 900 to 1200 mm for the balcony  with live loads + 600 to 750mm for
the
Quote:
chajja with closely spaced brickwalls as elevation treatment.

As we are aware cantilevers are not good for structures in siesmic zones,
these building structures turn out to be quite inefficient structurally.

Why can the building byelaws simply add a statement that in case the
balcony
Quote:
is a part of the room the column can be taken at the outer edge of the
balcony. By this simple statement the structure could be safe and
efficient
Quote:
too.

Vijay Patil


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