Pile Design Guide

PRESTRESSED PILING

TECHNICAL DETAILS AND SAMPLE CALCULATIONS

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Prestressed Piling Prestressed concrete piling are vital elements in the foundaons of buildings, bridges and marine structures throughout the world. They vary in size from 10 in. (254 mm) square piles used in building foundaons foundaons to the 66 in. (1676 mm) diameter cylinder piles used in marine structures and bridges. Many areas of North America have poor soil condions requiring pile foundaons for even relavely light structures. In such areas, prestressed concrete piling have come to be the usual method of construcon, having been proven the logical choice of materials where permanence, durability and economy must be considered. Heavy marine structures oen rely on prestressed concrete piling driven through deep water or through deep layers of unsuitable material for their support. Prestressed concrete piling can be designed to safely support these heavy loads as well as lateral loads caused by wind, waves and earthquakes. In marine environments these piles can resist corrosion caused by salt water and by thousands of cycles of weng and drying.1 The following pages contain the specicaons and service load interacon diagrams for the majority of the standard pile sizes for Heldenfels Enterprises, Enterprise s, Inc. This informaon is to be used to assist engineers in the design of their projects. This manual is not intended to replace the necessity of a profession engineered design.





























Precast/Prestressed Piling: Service Load Interaction Diagram

Service Load Interaction Diagram

500

400

) s p i k ( d a o L l a i x A e c i v r e S

300

200

100

0 0.0

10.0

20.0

30.0

40.0

‐100

‐200

Service Bending Bendin Moment (kip*feet) ki *f *feet eet

Pile Size = Concrete Normal Weight

12 " x 12 " Prestressing Strand Type =

270 270 ksi, ksi, Lolax

6000

psi

Size = 1/2" (std.)

4000

ps psi

Qty. =

4

Area = 0.153 in Pull =

75%

2

50.0

60.0















Precast/Prestressed Piling: Design Criteria and Input Design Criteria 1) Service Load Design. 2) Allowable Compressive Stress = 0.45f' c for SUSTAINED LOADS. 3) Allowable Tension Stress = 0 for SUSTAINED LOADS. 4) For TEMPORARY LOADS, Allowable Compressive Stress = 0.60f' c. 5) For TEMPORARY LOADS, Allowable Tension Stress = 0. 6) Assume a sustained compression service load equal to: 100 7) Use PCI method for estimating prestress losses. 8) Bending is about principle axes AND only one axis at a time. 9) Slenderness is not considered. 10) Ultimate capacity must be checked to ensure the required factor of safety is achieved in accordance with ACI 318.

Design Input Section Size: h= b=

12 12

kips.

inches inches

Section Area (accounting for chamfers, radii, etc.): Ag = 142 square inches Prestressing Strand: Type = 270 Size = 1/2" (std.) Qty. = 4 Area = 0.153 Pull = 75%

square inches per strand (initial)

Concrete: wc = f'c = f'ci = Ec = Eci =

pcf (concrete pcf (concrete weight) psi (28‐day Concrete Compressive Strength) psi (Required Concrete Release Strength) psi (concrete modulus of elasticity of elasticity at 28‐days) psi (concrete modulus of elasticity of elasticity at transfer of prestress) of prestress)

145 6000 4000 4,463,151 3,644,147

ksi, Lolax

































12 12

inches inches


ksi, Lolax


kips.



















500

400


300

200

100

0 0.0

10.0

20.0

30.0

40.0

‐100

‐200




270 ksi, ksi, Lolax

7000

ps psi

Size = 1/2" (std.)

4000

pi

Q

8

50.0

60.0



































14 14

inches inches


ksi, Lolax


kips.



















600

500

400 ) s p i k ( d a o L l a i x A e c i v r e S

300

200

100

0 0.0

10.0

20.0

30.0

40.0

50.0

‐100

‐200




270 270 ksi, ksi, Lolax

6000

psi

Size = 1/2" (std.)

4000

pi

Q

4

60.0

70.0

80.0







































14 14

inches inches

Section Area (accounting for chamfers, radii, etc.):

kips.





















700

600

500


400

300

200

100

0 0.0

‐100 ‐200

10.0

20.0

30.0

40.0

50.0

60.0

70.0

80.0

90.0







































16 16

inches inches

Section Area (accounting for chamfers, radii, etc.):

kips.






















600

500

400 ) s p i k ( d a o L

300

200




















Precast/Prestressed Piling: Design Criteria and Input Design Criteria 1) Service Load Design. 2) Allowable Compressive Stress = 0.45f' c for SUSTAINED LOADS. 3) Allowable Tension Stress = 0 for SUSTAINED LOADS. 4) For TEMPORARY LOADS, Allowable Compressive Stress = 0.60f' c. 5) For TEMPORARY LOADS, Allowable Tension Stress = 0. 6) Assume a sustained compression service load equal to: 7) Use PCI method for estimating prestress losses. 8) Bending is about principle axes AND only one axis at a time. 9) Slenderness is not considered.

400

kips.




















800 700 600 500 ) s p i k ( d a o L

400 300


























































Precast/Prestressed Piling: Design Criteria and Input Design Criteria 1)




















800






































Precast/Prestressed Piling: Design Criteria and Input Design Criteria 1)




















1,200


























































































































































































































































Pile Design Guide

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