I need to design some CFAs. Basically a steel micropile tube pushed into grout. From what I gather they are designed either as micropiles or drilled shafts. These are small diameter CFA and will be seeing some moment. AASHTO doesn't really provide any guidance for design other than axial compression/tension.
Would they be designed similar to concrete filled steel tubes (CFST) for flexure or is there some other method I should use to evaluate the structural capacity?
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