Advantage of prestressed concrete bridge deck
• High-strength concrete and high-tensile
steel, besides being economical, make for slender
sections, which are aesthetically superior.
·
Prestressed concrete bridges
can be designed as class I type structures
without
any tensile
stresses under service loads, thus resulting in a crack-free
structure.
·
In comparison with steel bridges, prestressed concrete
bridges require
very littlemaintenance.
·
Prestressed concrete
is ideally suited for composite bridge construction in which precast
prestressed girders support the cast in situ
slab deck. This type of con•
struction is very popular since it involves
minimum disruption of traffic.
·
Post-tensioned prestressed concrete finds extensive applications in long-span continuous girder
bridges
of variable
cross-section. Not only does it
make for
sleek. structures, but it also effects considerable saving in the overall cost of construction.
·
In recent years, partially prestressed concrete (type-3 structure) bas been
pre•
ferred for bridge construction, because it offers considerable economy in the
use of costly high-tensile steel in the girder.
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