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lateral load on concrete piles

lateral load on concrete piles

lateral load on concrete piles

(OP)
Consider cast-in-place reinforced concrete piles say 20" diameter and 30' deep placed at about 25' oc supporting a concrete grade  beam 10"w x 24"deep. The structure is pre-eng rigid frames also spaced 25' oc.  There is a horizontal thrust from the frame to be resisted by the foundation.  The floor is a slab-on-grade

What is the best method to design the piles for that lateral load? The soil can obviously vary from clay (where Cu is a factor) to sand.  Defection is critical and a limit must be established which the steel can tolerate. In large span buildings one usually resorts to battered, piles, or thrust rods across the building from springline to springline, or hairpin rods in the slab-on-grade. The line of thrust is at the top of the grade beam which is typically about 12" above finish grade. There is a moment between the yop of pile to the base of the steel to consider.   
 

RE: lateral load on concrete piles

Hairpin bars in the grade slab is the most common, but probably not the best method.  Separate ties encased in concrete below the slab is preferred by some engineers.

The pile must be reinforced for the moment resulting from the eccentricity of horizontal load.  That should not be a problem.   

BA

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