Precast segmental construction is more economic than in situ construction as thinner deck section is possible.
The reinforcement
in precast segmental construction and precast beam is significantly less than
other forms of construction. This is because less reinforcement is required
with lower early thermal effect and differential shrinkage.
Their prestress
quantities are also less compared to in situ deck.
The prestress
quantities for external tendons are more than internal tendons. This is due to
the reduction in bending resisting efficiency.
In general, the
range of bridge material quantities is considered well-defined, despite of the
fact that bridges may vary with different deck width and loading.
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