What
is post tensioned slab and what are its advantages?
(Question
asked by Mr Nainar
Uma Sentil)
Post-Tensioned
slabs (as its name suggests) are the slabs which have been
post-tensioned. The
slabs may be of any type (including solid flat slab, coffered slab,
ribbed
slab, beam & slab system, banded flat slab, paneled slab etc)
&
may be used in any location (including in roofs, foundations etc)
Post-tensioned
slabs offer many advantages over conventional reinforced concrete
slabs; some
of these are
More economical structures resulting
from the use of prestressing steels with a
very high tensile strength instead of normal reinforcing steels.
Larger spans and greater slenderness.
The latter results in reduced dead load,
which also has a beneficial effect upon the columns and foundations and
reduces
the overall height of buildings or enables additional floors to be
incorporated
in buildings of a given height.
Under
permanent load, very good behavior in
respect of deflections and
cracking.
Higher punching shear strength
obtainable by appropriate layout of tendons
Considerable
reduction
in construction time as a result of earlier striking of
formwork.
