DYWIDAG Circular Structure Repair with Hoop Tendons

DYWIDAG Circular Structure Repair with Hoop Tendons

Steel Specifications for Polypropylene-Coated Strand PCCP Hoops

For 7-wire Stress Relieved Steel Strand for Prestressed Concrete


Strand DesignationGrade 264 KSIGrade 270 KSI, Ultimate Stress - 270,000 psi
  67k
6/10" Compacted Strand		58k
6/10"		41k
1/2"
ASTM SpecificationASTM A 779 *ASTM A 416ASTM A 416
Strand Diameter Nominal 0.600 in.15.2 mm0.600 in.15.24 mm0.500 in.12.70 mm
Steel Area Nominal 0.256 sq.in.165 mm20.217 sq.in.140 mm20.153 sq.in.101 mm2
Steel Weight/LF 0.87 #/LF1.295 kg/m.74 #/LF1.10 kg/m0.52 #/LF0.78 kg/m
Modulus of Elasticity 28.5 x 106 psi1.96 x 106 bar28.5 x 106 psi1.96 x 106 bar28.5 x 106 psi1.96 x 106 bar
Minimum Guaranteed
Ultimate Tensile Strength (GUTS) 		67.4 kips299.8 kN58.6 kips260.7 kN41.3 kips183.7 kN
Temporary Jacking Force
(Max 80% of GUTS) 		53.9 kips239.8 kN46.9 kips208.6 kN33.0 kips146.8 kN
Initial Lockoff Load
(70% of GUTS) 		47.2 kips210.0 kN41.0 kips182.4 kN28.9 kips128.6 kN
Design Load
(60% of GUTS) 		40.4 kips179.7 kN35.2 kips156.4 kN24.8 kips110.3 kN
These data are representative. Mill test certifications of actual values are provided with each order of POLYSTRAND.
Conversion Factors

1 in = 25.4 mm
1 mm = 0.039 in
1 mm2 = 0.0016 in
1 in2 = 645.16 mm
1 kN = 224.8 lbs 		Nomenclature

Aps = Area prestress steel, nominal
Fpu = Force, minimum ultimate = Kips (kN)
fpu = Stress, minimum ultimate = ksi (N/mm2)

*See also British Standard 5896.
DYWIDAG Circular Structure Repair with Hoop Tendons - Material for Repair of Circular Structures

External Hoops Stress & Force

As related to pipe O.D. (based on 6/10 inch diameter, 58K strand).

Pipe I.D.Pipe O.D.Tendon LengthInitial AfterLong TermFinal
  (Circumference)Release Average Stress2Losses3AverageAverage Stress Force
[inches] / [m][inches] / [m][feet] / [m][ksi] / [MPa][ksi] / [MPa][ksi] / [MPa][kip] / [kN]
42 / 1.06748 / 1.21913.5 / 4.11141.9 / 9786.4 / 44.0135.3 / 93229.4 / 130
48 / 1.21958 / 1.47316.0 / 4.88146.5 / 1,0106.6 / 45.5139.9 / 96430.4 / 135
54 / 1.37264 / 1.62618.0 / 5.49153.4 / 1,0576.7 / 46.2146.8 / 1,01231.9 / 142
60 / 1.52471 / 1.80319.5 / 5.94155.2 / 1,0706.7 / 46.2148.6 / 1,02432.2 / 143
66 / 1.67678 / 1.98121.5 / 6.55159.6 / 1,1006.7 / 46.2152.9 / 1,05433.2 / 148
72 / 1.82985 / 2.15923.5 / 7.16161.9 / 1,1166.8 / 46.9155.2 / 1,07033.7 / 150
78 / 1.98192 / 2.33925.0 / 7.62163.4 / 1,1266.9 / 47.6156.5 / 1,07934.0 / 151
84 / 2.13499 / 2.51527.0 / 8.23165.1 / 1,1387.1 / 49.0158.0 / 1,08934.3 / 153
90 / 2.286106 / 2.69229.0 / 8.84166.6 / 1,1487.1 / 49.0159.5 / 1,09934.6 / 154
96 / 2.438111 / 2.81930.0 / 9.14167.3 / 1,1537.1 / 49.0160.2 / 1,10534.8 / 155
Notes:
  1. These values are approximations only. They are derived by a calculation of ADAPT Post-Tensioning Stress Loss & Elongation Program – FELT (Ver. 3.50), assuming stressing from one end only. This model does not exactly describe the behavior using a Surface LOKCOUPLER.
  2. Nominal cross section average of 58K strand is 0.217 sq.in.
  3. For existing PCCP, long term losses will be reduced due to the age of the concrete and therefore, negligible concrete creep or shrinkage.