How to check Jack efficiency test before PSC Girder stressing.

Calculation of Jack Pressure for Single Pull and Multi Pull Stressing

a) Single-Pull Stressing :

1. Design load per Strand in Kg

2. Losses due to Jack Efficiency (%) ( Add as per Jack Calibration Report )

3. Losses due to Anchorages (%) ( Add as per System Supplier’s Report )

4. Load per Strand including losses in Kg — P

5. Jack Ram Area in cm2 — JA

Jack Pressure (JP) = P / JA in Kg/
Multi-Pull Stressing : 

1. Design load per Strand in Kg

2. Load per Tendon (as per the type) in Kg

3. Losses due to Jack Efficiency (%) ( Add as per Jack Calibration Report )

4. Losses due to Anchorages (%) ( Add as per System Supplier’s Report )

5. Load per Tendon including losses in Kg — P

6. Jack Ram Area in cm2 — JA

Jack Pressure (JP) = P /JA in Kg/cm2

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