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Evaluating the Constructability of a 12.75" O.D. Closed-End Pipe Pile for Construction Control

This document discusses the static analysis of a 12.75-inch outer diameter closed-end pipe pile driven to a depth of 62.25 feet. It addresses the ultimate capacity of 420 kips achievable through a static load test and provides calculations for maximum axial design load, pile section selection, and driveability requirements. Additionally, it explores the suitability of a wall thickness of 0.109 inches made from ASTM A-252 Grade 3 steel, considering 28-day concrete strength parameters. The analysis further includes determined hammer size for the pile driving procedure.

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Evaluating the Constructability of a 12.75" O.D. Closed-End Pipe Pile for Construction Control

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  1. Is It Constructable ? 2011 PDCA Professor Pile Institute Patrick Hannigan GRL Engineers, Inc.

  2. 3 ft • Silty Clay • = 127 lbs / ft3 qu = 5.5 ksf Set-up Factor = 1.75 46 ft • Dense, Silty F-M Sand • = 120 lbs / ft3  = 35˚ Set-up Factor = 1.0 20 ft Static Analysis Problem Revisited

  3. Static Analysis Problem Revisited Static analysis indicates a 12.75 in O.D. closed-end pipe pile driven to 62.25 ft below grade can develop an ultimate capacity of 420 kips. A static load test will be used for construction control. No special design conditions exist (scour, downdrag, etc.). Therefore, a maximum axial design load of _______ kips can be used.

  4. Pick Pile Section – (Appendix C2-4) Given: 12.75 in O.D. closed-end pipe pile Select: wall thickness – try 0.109 in wall (lowest cost) ASTM A-252 Grade 3 steel – FY = 45 ksi 28 day concrete strength – f’c = 5 ksi

  5. Check Allowable Design Load (10-5) Design Load = 0.25 (FY)(steel area) + 0.40(f’c)(concrete area) = 0.25(45 ksi)(4.33 in2) + 0.40(5 ksi)(123.0 in2) = 48.7 kips + 246.0 kips = 294 kips Is this section suitable for an 420 kip ultimate pile capacity? ____

  6. Check Pile Driveability Driveability Requirements: Driving resistance between ____ and ____ blows/ft (see pg 11-15) Driving stress limit of 0.9(FY) = _____ ksi (see pg 10-5)

  7. Check Pile Driveability Determine Hammer Size: Rated energy for 420 kip ultimate capacity ____ ft-kips (see pg 21-36) Select trial hammer __________________________ (see Appendix D-1) Perform Wave Equation Analysis

  8. GRLWEAP Driveability Results For D-16-32

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