I don't follow the part about magnifying "the moments due to the
lateral loads to 2 or 2.5 times".
If P is small and V is big (which is what you indicate), then Q is
also very small and the magnification becomes insignificant. In fact,
according to Section 1910.11.4.2, if Q is less than 0.05 (as it may
well be in the case you have described), you may call the system
"nonsway" and comply with Section 1910.12.
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Michael Valley, P.E., S.E. E-mail: mtv(--nospam--at)skilling.com
Skilling Ward Magnusson Barkshire Inc. Tel:(206)292-1200
1301 Fifth Ave, #3200, Seattle WA 98101-2699 Fax: -1201
From: SDGSE(--nospam--at)aol.com [mailto:SDGSE(--nospam--at)aol.com]
Sent: Thursday, May 25, 2000 1:32 PM
Subject: Magnified Moments - UBC Section 1910.13
Does section 1910.13 of the 97 UBC apply to piles supporting grade
retaining wall on top. The axial load is the self weight of the wall
grade beams which is very small compared to the lateral load due to
pressure. The piles act mainly as cantilevered beams. IMHO, to magnify
moments due to the lateral loads to 2 or 2.5 times is somewhat
this condition, unless it is meant to magnify the moments due to the
loads only, which makes more sense. Your input is appreciated.
Oshin Tosounian, S.E.