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Micropiles Design 101 - Structural Engineers

1 Micropiles Design 101 Allen Cadden P EAllen Cadden, Chester, PALas Vegas, NV 2008 Objective 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 control3 Designers Must UnderstandAvailable Tools Drilling rigs Drilling rigs Drilling methods Available Structural Materials Reasonable Bond ValuesValues Quality ControlConstruction Techniques Drill Rig 4 Micropile Materials Permanent Steel Pipe API 5CT & ASTM A252 80 ksi yield Flush joint threads Steel Reinforcement ASTM A615, Gr.

G allowable b D P FS L × × × = − α π AASHTO LRFD Design Table 10.5.5.2.4-1 - Resistance Factors for Geotechnical Resistance of Axially Loaded Micropiles METHOD/SOIL/CONDITION RESISTANCE FACTOR Compression Resistance of Single Micropile, φ stat Side Resistance (Bond Resistance): Presumptive Values 0.55(1) Tip Resistance on Rock O’Neill ...

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