PGSuper
3.1
Precast-prestressed Girder Bridges
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Define project criteria for creep and camber.
NOTE: These parameters do not apply to time-step analysis
Item | Description |
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Time from stressing to prestress transfer | Enter the time from stressing of the pretension strands to imparting the force onto the girder. This time is used to compute initial relaxation losses. |
Time from prestress transfer until temporary strand removal/diaphragm casting | Enter the range of times when temporary strands will be removed and diaphragms cast |
Time from prestress transfer until deck casting or application of superimposed dead loads on noncomposite girders | Enter the range of time for this loading condition |
Total Creep Duration | Enter the total creep duration. Only used for bridges without composite decks. |
Variability between upper and lower bound camber | Enter the amount of camber variability that is to be expected. |
NOTE: Creep is assumed to stop once the deck becomes composite with the girder
NOTE: There is a natural variability in camber. PGSuper predicts an upper bound camber. The camber variability factor reduces the predicted camber by a percentage to estimate a lower bound value.
Used for estimating losses for project criteria based on AASHTO LRFD 3rd Edition with 2004 interims and earlier.