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UBC 97 anchor bolt design
- To: SEAINT <seaint(--nospam--at)seaint.org>
- Subject: UBC 97 anchor bolt design
- From: Jim Carey <jimcarey(--nospam--at)jgsteel.com>
- Date: Wed, 18 Dec 2002 08:48:42 -0600
Regarding design of
anchorage to concrete, from UBC 97 Section 1923.3 (strength
When checking the
steel strength, say for an A307 anchor bolt, Pss = 0.9*Ab*fut; fut is the
minimum specified tensile strength, given as 60,000 psi for A307 bolts. Ab
is the anchor area. The use of the tensile strength, rather than the
nominal strength of 45,000 as given in LRFD Table J3.2, would suggest that the
net tensile area should be used for Ab. The 1997 NEHRP, Section 184.108.40.206,
though, uses the same bolt strength equation with Ab defined as the 'area of the
shank of the bolt or stud'.
Knowing that normal
bolt allowables take into account the reduction in tensile area and allow the use of nominal areas, is this a
different situation in which the tensile area must be used?
for any insights on this.
Jim Carey, P.E.