Download - SS6-02.3(26) Post Tensioning Training
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Post-tensioning
Workshop
HQ Construction Office
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Structural Mechanics
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Tendon Path
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Materials
Mill Certifications:
• Ducts
Area of Strands
Modulus of Elasticity ( Max 3% variance)
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Standard Specs 9-07.10 Sampling & Testing
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Pre-stressing Preparation
Before Post-tensioning
• Ram/gage Calibration Certs
• Ram Calibration Curve
• Strand Mill Certs
(Actual Strand Area and Modulus of Elasticity)
• Prepare The P.T. Record Form
• Study Plans, Approved Shop Drawings,
Std. Specs, and Const. Manual
(See Handout)
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Verify Against Tested Samples
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HQ Construction will verify
through CalTrans
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Shop Drawings
• Duct Diameter.& Strand Sizes and # / Duct
• Anchorage Type
• Tendon Geometry
• Verify Jack Size
• Stressing Sequence
• Vents & Drains
• Jacking Force & Seated Force
• Tendon Elongations
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Elongation Adjustment
Delta = 0.8 X Elong. (From shop Plans)
Delta (corrected) = Delta (A(cal)/A(act))(E(cal)/E(act))
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Force Calculations
To = Tx e (KL + u Alpha)
K = Wobble friction Coefficient
u = Angular Friction Coefficient
Alpha = Tendon Angle Change
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Before Post-tensioning
• Min. Concrete Comp. Strength 4000 psi
(Unless Plans Specify)
• Remove Side Forms & Release Overhang
Brackets Before Post-tensioning
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Release Forms
Before Post-tensioning
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Hood Canal Bridge
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Excess Duct
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Cracks
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Anchor Plate Anchor Plate
Anchor Head
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VPI Powder
• Needed when 7 days elapsed
before grouting
•Highly toxic
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Safety
• Do not stand in front of the tendons
or ram at either end
• Avoid standing above the
anchorages
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Broken Strand – Eastern Region
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Lift-off
Force Verification
• Elongation > 107% Calculated
• Elongation < 93% Calculated
• Lift-off Force > 99% Calculated < 0.7 F’s
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Lift-off Chair
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Load Cell
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Load Cell
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High Strength Bar Tendons
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Grouting
• Non-segregating, thixotropic pre-
packaged grout required.
• High-shear colloidal mixer (no
paddle mixers)
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Colloidal Mixers Colloidal Mixers
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Tendon Bleeding
• Allow the Air to Escape
• Drain Bleed Water
• Close Vents
• Maintain Pressure (100-200psi)
For min. 10 Sec.
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Latest specifications require
three vents – one at high point,
and a vent upstream and
downstream of high point.
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Grout Cap Vent on
Top
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Grout Voids
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Falsework Release
• No Vibration producing equipment on the
the Bridge After Grouting
• Release Falsework a Min. Of Two Days After
P.T. Duct Grouting
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Unbonded Tendon
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Void
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Unsecured Duct Tape
External Conduits
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Post-tensioning on Curved Structures
• Ties are needed
• Minimum Cover of 2.5”
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Field Problems
• Out of Tolerance Elongation
• Verification of Force (lift-off)
• Severed Strand Wires
• Uneven Strand Elongation
• Excessive Volume of Grout
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![Page 111: SS6-02.3(26) Post Tensioning Training](https://reader034.vdocuments.mx/reader034/viewer/2022051301/585141131a28abfa398bfcdf/html5/thumbnails/111.jpg)
Send a Copy of p.t. Records to The
HQ Construction
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Sample Calculations
![Page 113: SS6-02.3(26) Post Tensioning Training](https://reader034.vdocuments.mx/reader034/viewer/2022051301/585141131a28abfa398bfcdf/html5/thumbnails/113.jpg)
1
05/10 Pier 2 1 6-8-8 East
Sample Calculations
![Page 114: SS6-02.3(26) Post Tensioning Training](https://reader034.vdocuments.mx/reader034/viewer/2022051301/585141131a28abfa398bfcdf/html5/thumbnails/114.jpg)
Approved Shop Drawings
![Page 115: SS6-02.3(26) Post Tensioning Training](https://reader034.vdocuments.mx/reader034/viewer/2022051301/585141131a28abfa398bfcdf/html5/thumbnails/115.jpg)
1
05/10 Pier 2 1 6-8-8 East
Sample Calculations
835 19
![Page 116: SS6-02.3(26) Post Tensioning Training](https://reader034.vdocuments.mx/reader034/viewer/2022051301/585141131a28abfa398bfcdf/html5/thumbnails/116.jpg)
Ram Calibration (Raw Data)
![Page 117: SS6-02.3(26) Post Tensioning Training](https://reader034.vdocuments.mx/reader034/viewer/2022051301/585141131a28abfa398bfcdf/html5/thumbnails/117.jpg)
835 kips 167 kips
1200 psi
5900 psi
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05/10 Pier 2 1 6-8-8 East 835 19
1
Sample Calculations
1200 1200 5900
1200
5900
![Page 119: SS6-02.3(26) Post Tensioning Training](https://reader034.vdocuments.mx/reader034/viewer/2022051301/585141131a28abfa398bfcdf/html5/thumbnails/119.jpg)
![Page 120: SS6-02.3(26) Post Tensioning Training](https://reader034.vdocuments.mx/reader034/viewer/2022051301/585141131a28abfa398bfcdf/html5/thumbnails/120.jpg)
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Adjust Elongation for actual strand
area/modulus
Δ(corrected) = Δ(shop) (A(shop)/A(act)) (E(shop)/E(act))
A(shop) = 0.217 in2 A(act) = 0.2171 in2
E(shop) = 28,000 ksi E(act) = 29,000 ksi
Δ(shop) = 5 ½ in.
Δ(corrected) = (5 ½”)(0.217/0.2171)(28000/29000)
Δ(corrected) = 5.308 in = 5 ⅜ in
![Page 122: SS6-02.3(26) Post Tensioning Training](https://reader034.vdocuments.mx/reader034/viewer/2022051301/585141131a28abfa398bfcdf/html5/thumbnails/122.jpg)
05/10 Pier 2 1 6-8-8 East 835 19
1
Sample Calculations
1200 1200 5900
1200
5900 5⅜” ⅜”
![Page 123: SS6-02.3(26) Post Tensioning Training](https://reader034.vdocuments.mx/reader034/viewer/2022051301/585141131a28abfa398bfcdf/html5/thumbnails/123.jpg)
![Page 124: SS6-02.3(26) Post Tensioning Training](https://reader034.vdocuments.mx/reader034/viewer/2022051301/585141131a28abfa398bfcdf/html5/thumbnails/124.jpg)
05/10 Pier 2 1 6-8-8 East 835 19
1
Sample Calculations
1200 1200 5900
1200
5900 5⅜” ⅜”
5¾” 1½” 7¼”
6¾” Dead End Anchor Set -⅛”
5⅝”
105%
![Page 125: SS6-02.3(26) Post Tensioning Training](https://reader034.vdocuments.mx/reader034/viewer/2022051301/585141131a28abfa398bfcdf/html5/thumbnails/125.jpg)
Verify Anchor Set
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05/10 Pier 2 1 6-8-8 East 835 19
1
Sample Calculations
1200 1200 5900
1200
5900 5⅜” ⅜”
5¾” 1½” 7¼”
6¾” Dead End Anchor Set -⅛”
5⅝”
105% ½”
![Page 127: SS6-02.3(26) Post Tensioning Training](https://reader034.vdocuments.mx/reader034/viewer/2022051301/585141131a28abfa398bfcdf/html5/thumbnails/127.jpg)
Say 3’-0”
Jack Elongation = 1/16 in/ft x 3 ft = 3/16 inch
![Page 128: SS6-02.3(26) Post Tensioning Training](https://reader034.vdocuments.mx/reader034/viewer/2022051301/585141131a28abfa398bfcdf/html5/thumbnails/128.jpg)
05/10 Pier 2 1 6-8-8 East 835 19
1
Sample Calculations
1200 1200 5900
1200
5900 5⅜” ⅜”
5¾” 1½” 7¼”
6¾” Dead End Anchor Set -⅛”
5⅝”
105% ½”
Jack Elongation = 3/16”
5/16”
![Page 129: SS6-02.3(26) Post Tensioning Training](https://reader034.vdocuments.mx/reader034/viewer/2022051301/585141131a28abfa398bfcdf/html5/thumbnails/129.jpg)
PT Record Keeping Complete
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Project-Specific Details
![Page 131: SS6-02.3(26) Post Tensioning Training](https://reader034.vdocuments.mx/reader034/viewer/2022051301/585141131a28abfa398bfcdf/html5/thumbnails/131.jpg)
Construction Sequence
![Page 132: SS6-02.3(26) Post Tensioning Training](https://reader034.vdocuments.mx/reader034/viewer/2022051301/585141131a28abfa398bfcdf/html5/thumbnails/132.jpg)
Post-tensioning elevations and sections
![Page 133: SS6-02.3(26) Post Tensioning Training](https://reader034.vdocuments.mx/reader034/viewer/2022051301/585141131a28abfa398bfcdf/html5/thumbnails/133.jpg)
Post-tensioning profile and notes
![Page 134: SS6-02.3(26) Post Tensioning Training](https://reader034.vdocuments.mx/reader034/viewer/2022051301/585141131a28abfa398bfcdf/html5/thumbnails/134.jpg)
Comments/thoughts?