Advantages
and disadvantages when partial prestressing is done
PARTIAL
PRESTRESSING:
The degree of prestress applied to concrete in which
tensile stresses to a limited degree are permitted in concrete under working
load. In this case, in addition to tensioned steel, a considerable proportion
of untensioned reinforcement is generally used to limit the width of cracks
developed under service load.
ADVANTAGES:
·
Limited tensile stresses are permitted
in concrete under service loads with controls on the maximum width of cracks
and depending upon the type of prestressing and environmental condition.
·
Untensioned reinforcement is required in
the cross-section of a prestresseed member for various reasons, such as to
resist the differential shrinkage, temperature effects and handling stresses.
·
Hence this reinforcement can cater for
the serviceability requirements, such as control of cracking, and partially for
the ultimate limit state of collapse which can result in considerable reduction
in the costlier high tensile steel.
·
Saving in the cost of overall structure.
DISADVANTAGES:
·
The excessive upward deflections,
especially in bridge structure where dead loads from a major portion of the
total service loads, and these deflections may increase with time of creep.
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