Design Information
Standard Sections
Prestressed Piles

SCI prestressed concrete piles are important elements used in the foundations of buildings, bridges and marine structures. Throughout Australia, many areas have poor soil conditions which therefore make precast, prestressed concrete pile foundations an obvious choice for construction. This is also true for light-load structures. Prestressed piles are the preferred choice among designers when performance, durability and economy are considered.




When precast prestressed piles are used in aggressive soil or marine applications they can be designed for long-life durability, to safely support vertical loads together with bending moment arising from lateral loads such as wind, waves and earthquake, as essentially uncracked sections.

The level of prestress is chosen to ensure crack-free performance is achieved for the service load and, accordingly, members are very durable in resistance to chloride-induced corrosion of the reinforcement.




Section Size, D
(mm)
Area, Apc
(mm2)
Moment of
Inertia, I

(mm4)
Radius of
gyration, R

(mm)
Section of
Modulus, Z

(mm3)
Mass
(kN/m)
Perimeter
(mm)
Strand
No./size
Allowable concentric imposed action (kN)*
for concrete strength (MPa)
32 40 50 60
Square
(solid)
350 122,500 1250 x 106 101 7146 x 103 3.00 1400 8/12.7 1055 1375 1780 2185
400 166,000 2133 x 106 116 10,666 x 103 3.92 1600 8/12.7 1450 1870 2400 2930
450 202,500 3417 x 106 130 15,187 x 103 4.97 1800 10/12.7 1840 2375 3040 3710
600 360,000 10,800 x 106 173 36,000 x 103 8.83 2400 16/12.7 3220 4275 5460 6650
Octagonal
(solid)
400 132,622 1403 x 106 103 7015 x 103 3.25 1328 8/12.7 1160 1510 1950 2385
450 167,652 2242 x 106 116 9964 x 103 4.11 1488 8/12.7 1530 1970 2525 3080
550 250,660 5011 x 106 141 18,223 x 103 6.15 1824 12/12.7 2290 2950 3780 4605
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*Allowable actions based on: N=Apc(0.33fc-0.27fpe)
N=allowable axial Service Load (kN)
Apc= cross section area of concrete (mm2)
f'c=characteristic 28 day compressive strength of concrete (MPa)
fpe=effective prestress after losses (MPa)


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