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# Re: Hankinson with different LDF's

• To: seaint(--nospam--at)seaint.org
• Subject: Re: Hankinson with different LDF's
• From: David Topete <d.topete73(--nospam--at)gmail.com>
• Date: Mon, 30 Aug 2010 15:14:07 -0700

But, the soil loading is "static."  How can a 1.6 LDF increase be justified for that loading direction?  I think it's similar to a steel beam loaded in both the strong and weak axes.  The interaction equation from the green steel manual (9th Ed. ASD).  fbx/Fbx + fby/Fby <= 1.00   Any LDF's, such as short term loading due to wind/seismic/impact and applied left of "<=", and not to the right of it.  Just my thoughts...

On Fri, Aug 27, 2010 at 3:54 PM, Joseph R. Grill wrote:

But the loads are being applied at the same time, so wouldn’t the LDF of 1.6 be used on the final Z theta after the equation is run without adjusting Z perp and Z parl?

Joseph R. Grill, PE

Verde Valley Engineering, PLLC

From: David Topete [mailto:d.topete73(--nospam--at)gmail.com]
Sent: Friday, August 27, 2010 10:31 AM
To: seaint(--nospam--at)seaint.org
Subject: Re: Hankinson with different LDF's

LDF = 0.9 for "static loading" from soil...  LDF = 1.6 for wind-induced shear....  I'd applied each to each Z_perp and Z_parl respectively...  The 0.9*Z_perp will be the governing case....

On Wed, Aug 25, 2010 at 2:42 PM, Joseph R. Grill <vveng(--nospam--at)cableone.net> wrote:

If you have an anchor bolt in a sill plate with a top of wall restraint force from soil loading of 200 plf  perpendicular to grain and a parallel to grain load from a shear wall of 250 plf.  Are the LDF’s of .9 and 1.6 applied before input to the Hankinson formula or is the result from the formula multiplied by the larger LDF of 1.6?  Sudden brain blockage

Thanks, Joe

Joseph R. Grill, PE

Verde Valley Engineering, PLLC

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David Topete, SE

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David Topete, SE