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Composite Secant Files

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burnhakp

Geotechnical
Jun 15, 2011
10
US
I have a 3'10" diamater secant pile with a W27x84 soldier pile spaced everyother pile (6.25'). The compressive strength of the concrete is 4 ksi.How can I determine the composite bending capacity of the the secant pile? I am currently exceeding the bending moment of the wide flange and need to start taking into account the strenght of the concrete.
 
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Unless you have shear connectors between the steel beam and the concrete (headed anchor studs for example) you can't assume composite action.

In my experience the contractor always prefers a heavier beam with no shear connectors to a lighter beam with the connectors. You can easily fit a larger beam in that large a shaft.

If you need to use that size beam, the AISC manual goes through the steps of composite beam design.
 
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