8. Tension Limit States 3. & 7.: Weld rupture at reinforcing/locking mechanism interface Note: Welds are designed to develop reinforcing Butt-Joint at female socket Lap-Joint at Male Stud
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10. Compression Compression is transferred directly through bearing of faying surfaces Assembly Diagram of Emeca Joint
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12. Tension Tensile Limit States 1.&9. Transfer tensile force from prestress to mild reinforcing 2.&8. Tensile yield of mild reinforcing 3. Weld rupture at female socket 4. Tensile rupture of female socket 5. Shear rupture of pin 6. Tensile rupture male stud 7. Weld rupture at male stud
13. Tension Limit States 1 & 2: CASE 2: L embed. < L d for strand: * Bond Limit (Strand) OR Mild Reinforcing Steel Limit * Ref: ACI 12.9.1 CASE 1: L embed. ≥ L d for strand: Rupture Limit (Strand) OR Mild Reinforcing Steel Limit
19. Bending Analysis at Joint S1- Reinforced Section (12-in. pile) M n = 41.7 ft-k
20. Bending Analysis at Joint max. stress in strand = f ps = 173 ksi S2- Prestress Section (12-in. pile)
21. Bending Analysis at Joint S2- Prestress Section (12-in. pile) PCI Figure 4.12.4 (p. 4-122) 30 in. 173 ksi
22. Bending Analysis at Joint f ps = 173 ksi M n = 33.5 ft-k S2- Prestress Section (12-in. pile)
23. Analysis at Joint Summary: Unreduced Capacities of Pile at Joint 12-in. Pile Splice 14-in. Pile Splice Limit Tension - T n 95.6 kips 150 kips Yield of Mild Reinforcing Bending - M n 33.5 ft-kips 55.2 ft-kips Strand Slip reinforcing added - M n 41.5 ft-kips 73.7 ft-kips Yield of Mild Reinforcing Shear - V n 19.0 kips 26.4 kips Shear Capacity of Pile
26. Bending Tests – University of South Carolina Test Set-up: Recorded Data: - Load - Displacement at ¼ points - Rotation at Joint Loading Protocol: - Quasi-static loading
27. Bending Tests – University of South Carolina Test Specimens (12 Total): I. Splice only (6) 28-ft. long piles, spliced at midpoint (3) 14-in. Specimens (6 strand) (3) 12-in. Specimens (4 strand) II. Splices with “Auxiliary Reinforcing” (6) 28-ft. long piles, spliced at midpoint (3) 14-in. Specimens (6 strand) (3) 12-in. Specimens (4 strand) Auxiliary reinforcing – (4) #5’s x 60”
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29. Bending Tests Moment Strength Results (ft-kips): M n ′ –Calculated theoretical moment using tested material strength: F y = 73 ksi f c ′ = 7,000 psi Theoretical Test Results Mean Low M n M n ′ Mean Low M n ′ M n ′ Splice Only 12 in. 37 47 53.6 52.7 114% 111% 14 in. 61 79 85.4 77 108% 97% Auxiliary Reinforcing Added 12 in. 37 53 63 59.7 119% 112% 14 in. 67 93 99.3 90.5 107% 97%
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38. Projects Owner: Vitol Oil Company Contractor: Sun Marine Project Status: Complete Emeca Product: 12-in. Pile Joints Notes: 6300, 100-ft-long piles installed Vitol Oil Tank Farm, Seaport Canaveral, FL
39. Projects Owner: Northrup Grumman Contractor: Ford Pile Foundations Project Status: Active Emeca Product: 12-in. Pile Joints Notes: Piles and splices designed to resist hydrostatic tension Northrup Grumman Naval Shipyard - Dry Dock Facility, Newport News, VA
40. Projects Contractor: Junttapojat Oy Emeca Product: 14-in. Pile Joints Notes: - 8000 Emeca Pile Joints used on project - 656,000 total pile length - Up to 105 foot long piles driven in 3 sections - Battered piles driven at 4V:1H Vousaari Harbor Project for the Port of Helsinki, Helsinki, Finland
42. Projects Contractor: Kiewit Construction Project Status: Active Emeca Product: 14-in. Rock Points customized for 30-in.-square concrete piles Notes: Piles driven through concrete mooring anchors at approximately 30-ft. Brayton Point Cooling Tower, Summerset, MA
43. Projects Anacostia Naval Station Drainage Phase IV, Washington, DC Owner: NAVFAC Project Status: Completed August 2008 General Contractor: Corinthian Contractors Pile Contractor: Coastal Pile Driving, Inc. Property Manager: Whiting-Turner Contracting Product: 12-in. Pile Joints Notes: Up to 83-ft-long spliced piles
Editor's Notes
Photo of piles segments being joined in Finland The splice component is identical: -simplifies casting and storage of piles Discuss anatomy of splice
Photo of piles segments being joined in Finland The splice component is identical: -simplifies casting and storage of piles Discuss anatomy of splice
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