预应力损失

来源：抵帆知识网

CALCULATING FRICTION AND ANCHOR SET LOSSES IN POST-TENSIONED TENDONSProblem Description:

Steel Ultimate Stress

Prestress Ratio

Jacking StressAnchor Set Modulus Elasticity

Curvature Friction CoefficientWobble Friction CoefficientSeating Losses at AnchorConversion Point from anchorStress at Conversion Point

Web Tendons in 90-foot typical girderfpu =fjack/fpu =fjack =DL =Es =m =k =Df =Lc =fconv =

270ksi0.75202.50.375280000.250.0002ksiinksi1/ftUnits:

US35.87ksi48.79ft184.6ksi

0.000Analysis Completed Design SectionsDistanceStressfromafterjackingseatingendftksi0#NAME?30#NAME?56.34#NAME?60#NAME?90#NAME?Point No.1234567101112131415DL*E =

Input Tendon GeometryDistanceAngularfromSegmentchangejackingLength aendftftrad00030300.260300.290300.2909090909090909090909010500kip/in

Stresses in TendonDistancefromjackingendft0.0030.0048.7960.0090.0090.0090.0090.0090.0090.0090.0090.0090.0090.0090.00Priorseatinglossesksi202.5191.5184.6180.4169.4169.4169.4169.4169.4169.4169.4169.4169.4169.4169.4Afterseatinglossesksi166.6177.7184.6180.4169.4169.4169.4169.4169.4169.4169.4169.4169.4169.4169.4Shall be equal to the area between stress diagrams

STRESS IN POST-TENSIONING TENDON(Stressing from the left)s [ksi]/[Mpa]250200150100Stress [10050001020304050607080Distance along cable, [ft]/[M]PrestLossCopyright © 2000Yakov Polyakov, PEyakpol@hotmail.comhttp://yakpol.net8090100

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