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Magnified Moments - UBC Section 1910.13

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Does section 1910.13 of the 97 UBC apply to piles supporting grade beams with 
retaining wall on top. The axial load is the self weight of the wall and 
grade beams which is very small compared to the lateral load due to the earth 
pressure. The piles act mainly as cantilevered beams. IMHO, to magnify the 
moments due to the lateral loads to 2 or 2.5 times is somewhat excessive for 
this condition, unless it is meant to magnify the moments due to the axial 
loads only, which makes more sense. Your input is appreciated.

Oshin Tosounian, S.E.