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How can we reduced frictional losses
Frictional losses can be reduced by several methods, such as :
(a) Over-tensioning the tendons by an amount equal to the maximum frictional loss, and
(b) Jacking the tendons from both ends of the beam, generally adopted when the tendons are long or when the angles of curvature are large.
Given: pretensioned rectangular beam b=6" h=20" f'c=4000psi f'ci=3000psi fti=.165ksi fts=.38ksi fci=1.8ksi fcs=1.8ksi R=0.80 Required: (a)Pi and e to maximize Md+
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