Maximum Length of PT Bridge beam for single live stressing

[PSR_1]

Hello guys!

According to AASHTO or other equivalent bridge code is there a specified limit for single live stressing of post tensioned bridge beams or box girders? usually for building the limit is about 32 meters, does that apply to bridges?

 

[centondollar]

You'd have to do a parameter study (calculate frictional prestress loss for various girder configurations) on a select few cases relevant to you. In general, the friction loss increases with increasing angular change and tendon length, so a straight tendon is most favorable and a curved (say, mostly parabolic) tendon in a deep girder is less favorable w.r.t. frictional losses.