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1、CALCULATING FRICTION AND ANCHOR SET LOSSES IN POST-TENSIONED TENDONSProblem Description:Web Tendons in 90-foot typical girderSteel Ultimate Stressfpu=270 ksiUnits:USPrestress Ratiofjack/fpu=0.75Jacking Stressfjack=202.5 ksiAnchor Set DL=0.375 inModulus ElasticityEs=28000 ksiCurvature Friction Coeffi2、cientm =0.25Wobble Friction Coefficientk=0.0002 1/ftSeating Losses at AnchorDf=35.87 ksiConversion Point from anchorLc=48.79 ftStress at Conversion Pointfconv=184.6 ksi0.000Analysis CompletedInput Tendon GeometryStresses in Tendon Design SectionsPoint No.DistancefromjackingendSegmentLengthAngularcha3、nge a aDistancefromjackingendPriorseatinglossesAfterseatinglossesDistancefromjackingendStressafterseatingftftradftksiksiftksi10000.00202.5166.60#NAME?230300.230.00191.5177.730#NAME?360300.248.79184.6184.656.34#NAME?490300.260.00180.4180.460#NAME?59090.00169.4169.490#NAME?69090.00169.4169.479090.00164、9.4169.489090.00169.4169.499090.00169.4169.4109090.00169.4169.4119090.00169.4169.4129090.00169.4169.4139090.00169.4169.4149090.00169.4169.4159090.00169.4169.4DL*E=10500 kip/inShall be equal to the area between stress diagramsSTRESS IN POST-TENSIONING TENDON(Stressing from the left)1009080706050403025、0100050100150200250Distance along cable,ft/MStress ksi/MpaSTRESS IN POST-TENSIONING TENDON(Stressing from the left)1009080706050403020100050100150200250Distance along cable,ft/MStress ksi/MpaPrestLossCopyright 2000Yakov Polyakov,PEhttp:/STRESS IN POST-TENSIONING TENDON(Stressing from the left)1009080706050403020100050100150200250Distance along cable,ft/MStress ksi/MpaSTRESS IN POST-TENSIONING TENDON(Stressing from the left)1009080706050403020100050100150200250Distance along cable,ft/MStress ksi/Mpa