Subject: Re: FAQ on earthquake resistant construction - your technical comments invited
Date: 1 Feb 2001 14:18:04 -0000
Quoting bhagavan :
> Hello Seaint members,
> As an Indian, affected by the latest
devastating earthquake, I would > like to bring
awareness about \"earthquake resistant
construction\" to our > fellow Indians in
particular and also to the citizens of other >
countries. In this context, I have prepared a
small session of > \'Frequently asked questions &
answers\'. May I request our learned > colleagues
to suggest me the improvements / corrections /
comments on > this FAQ, if any.
> Thanking you, in anticipation of your
> EARTHQUAKE RESISTANT CONSTRUCTION (ERC)
> It is a session of FAQ on ERC
> * Is it possible to predict earthquakes?
> * Is it Possible to prevent earthquakes?
> * Are earthquakes destructive and devastating?
> Yes! Because they destroy infrastructure.
Hence, they are devastating.
> * Do earthquakes kill people?
> No - not directly!
> * But, how people are killed during earthquakes?
> Collapse of building structures in which they
live, during the > earthquake kills people.
Hence, the real culprits are our construction >
practices and poor quality of construction. The
conventional buildings > instantly collapse
without any warnings, during the unpredictable
and > sudden earthquakes.
> * Is it possible to build totally earthquake
proof building structure?
> -It is not feasible and economical to design
and construct totally > earthquake proof building
structures, particularly to withstand very >
severe earthquakes of magnitude above 8.0
> - But it is very much possible to design and
construct earthquake > resistant building
structures, though they may suffer huge damage
for > severe earthquakes, which will not kill
> *What is the best building construction
practice to resist earthquakes?
> Shear wall concept!
> * What is shear wall concept in building
> In this concept the walls are not only designed
to resist gravity / > vertical loads (due to its
self weight and other living / moving loads), >
but they are also designed for lateral loads of
earthquakes / cyclones. > The walls are
structurally integrated with roofs / floors
(diaphragms) > and other lateral walls running
across at right angles.
> * How is it structurally superior to the
conventional construction > practices of load
bearing masonry structures and / or Reinforced
Cement > Concrete (RCC) framed structure(of
concrete beams, columns and slabs)?
> - The load bearing masonry is very brittle
material. Due to different > kinds of stresses
such as shear, tension, torsion, etc., caused by
the > earthquakes, the conventional unreinforced
masonry collapses instantly > during the
unpredictable and sudden earthquakes!
> - The RCC framed structures are slender, when
compared to shear wall > concept of box like
three-dimensional structures. Though it is
possible > to design the earthquake resistant RCC
frame, it requires extraordinary > skills at
design and construction levels, which can not be
anticipated > in all constructions projects!
> - On the other hand even moderately designed
shear wall structures are > comparatively
ductile. In safety terms it means that, during
earthquakes > they will not suddenly collapse
causing death of people. They give > enough
indicative warnings such as widening structural
cracks, yielding > rods, etc., offering most
precious moments for people to run out off >
structures, before they totally collapse.
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