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RE: Anchor Bolts Again

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The 1997 NEHRP addressed the issue of headed anchor bolts vs. L bolts in
masonry.  Both are allowed, but the L bolts have one additional check in
NEHRP to see if the pull through governs.  The ACI 530-99 still does not
require the check for pull through.

Regards,
Harold Sprague


> -----Original Message-----
> From:	Nels Roselund [SMTP:n.roselund(--nospam--at)worldnet.att.net]
> Sent:	Wednesday, September 27, 2000 8:41 PM
> To:	seaint(--nospam--at)seaint.org
> Subject:	Re: Anchor Bolts Again
> 
> 
> Mark,
> 
> Part of the answer may have to do with UBC Section 2106.2.14.1, which
> allows
> anchor bolts to be bent anchor bolts, which can be pulled out of the
> masonry
> by straightening of the bend.
> 
> Nels Roselund
> Structural Engineer
> >
> >-----Original Message-----
> >From: Mark Pemberton [mailto:Markp(--nospam--at)lbdg.com]
> >Sent: Wednesday, September 27, 2000 11:19 AM
> >To: 'seaint(--nospam--at)seaint.org'
> >Subject: Anchor Bolts Again
> >
> >
> >Does anybody know why the tensile strength of an anchor
> >bolt in concrete is so much higher than in masonry?
> >(Assuming the stress in the bolt governs)
> >
> >Concrete: Pss = 0.9Ab(fut)
> >Masonry: Btn = 0.4Ab(Fy)
> >
> >For an A36 rod I get: Pss = 0.9Ab(58) = 52.2Ab
> >                               Btn = 0.4Ab(36) = 14.4Ab
> >
> >Am I missing something?
> >
> >Mark Pemberton, P.E..
> >

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