Micropiles Design 101 - Structural Engineers

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1Micropiles Design 101Allen Cadden P EAllen Cadden, Chester, PALas Vegas, NV 2008Objective Develop a background understanding of the geotechnical and Structural Design processes for Micropiles in Structural foundation support for Considerations5Bi fD i Design for Engineers Fundamentals are similar to Fundamentals are similar to traditional pile Design However, due to the small Structural section, Structural Design and stiffness can often controloften control3Designers Must UnderstandAvailable Tools Drilling rigs Drilling rigs Drilling methods Available Structural Materials Reasonable Bond ValuesValues Quality ControlConstruction Techniques Drill Rig 4Micropile Materials Permanent Steel Pipe API 5CT & ASTM A252 80 ksi yield Flush joint threads Steel Reinforcement ASTM A615, Gr.

AASHTO Driven Unfilled with increase for unlikely damage ACI with LF = 1.55 FHWA Micropiles AASHTO Caisson CODE 0.25 0.25 0.40 86.2 13.8 0.33 0.33 JAMP 0.59 0.59 324.5 0.59 0.59 AASHTO Driven Concrete Filled NO increase for unlikely damage 2006 IBC: 0.33f’c, 0.4fy (max 32ksi) compression: 0.6fy tension AASHTO LRFD Design

  Code, Design, Aashto, Lrfd, Aashto lrfd design