# 2011 pdca constructability check student

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Is It Constructable ?
2011 PDCA Professor Pile Institute

Patrick Hannigan
GRL Engineers, Inc.
Static Analysis Problem Revisited
3 ft
Silty Clay
 = 127 lbs / ft3
qu = 5.5 ksf
46 ft
Set-up Factor = 1.75

Dense, Silty F-M Sand
20 ft
 = 120 lbs / ft3
 = 35˚
Set-up Factor = 1.0
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.
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

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? ____
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)
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
GRLWEAP
Driveability
Results
For D-16-32

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