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
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? ____
         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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posted:9/15/2012
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