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Posted: Fri Jan 23, 2004 5:57 pm Post subject: Bam - BAMBAY
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.
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