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Bam - BAMBAY

 
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s_n_surya at yahoo.com
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PostPosted: Sat Jan 24, 2004 3:10 pm    Post subject: Bam - BAMBAY Reply with quote

DEAR ALL
THE STRUCTURAL ENGINEERS NEGLECT THE TORSIONAL EFFECTS
OF THESE CANTILEVER BEAMS,&PRESUME EVERY THING SAFE.
HOWEVER IN PLASTIC ANYLISIS OF STEEL STRUCTURES WE
HAVE AN OPPURTUNITY TO COSIDER THE FAILURE PATTEREN
BEFORE DESIGNING  THE BALCONY
SURYA
--- vjkpatil@vsnl.com wrote:
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
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
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
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
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
out by 600 to 750 mm with brickwalls on the edges of
these cantilever chajja
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
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
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
too.

Vijay Patil


















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