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Re: Stripping Treads
- To: seaint(--nospam--at)seaint.org
- Subject: Re: Stripping Treads
- From: chuck utzman <chuckuc(--nospam--at)pacbell.net>
- Date: Fri, 29 Sep 2006 13:34:13 -0700
I could take a look in my Northrop Design Manual circa 1968 :o) is
that prior enough?|
Chuck Utzman, P.E.
Rich Lewis wrote:
I’m looking for the
design equation for stripping
threads. I have anchor bolts in tension and the bolt doesn’t extend
through the nut. Now I have to sharpen a pencil and see if the design
force is less than what would strip what is left of the threads on the
not then the contractor will need to weld an extension onto the bolts.
I’m having a difficult
time finding design literature
on this. AISC doesn’t cover bolts. Logic tells me it is the area of
shear of the pitch diameter of the threads. Since the pitch diameter
between the peaks and valleys, it would be ½ the perimeter area of the
section put in shear by the tension force on the nut/bolt. I found a
for a bolt guide in one of Harold S old posts to a 1998 NASA RP-1228
Design Manual”. In this report they recommend using 1/3 the perimeter
area of the pitch diameter to account for loose fit of the nut and
makes sense to me. The equation is P=(PI*DIA*Fs*L)/3 where DIA is the
diameter. It is written for yield strength and ultimate tensile
was going to input 0.6*Fy and 0.5*Fu to come up with allowable loads.
I’ve been searching other
books and haven’t found
any reference to analysis or design recommendations for stripping
forces on a thread.
Surely there had to be some recommendations prior to the 1998 NASA
Can anyone give me other references to analysis and design of bolt