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RE: Stripping Treads
[Subject Prev][Subject Next][Thread Prev][Thread Next]- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: Stripping Treads
- From: "Dave Adams" <davea(--nospam--at)laneengineers.com>
- Date: Mon, 2 Oct 2006 15:43:05 -0700
Title: Message
Rich,
The
edition of the NASA manual that is available online is actually 1990, not
1998. It can be found here: http://gltrs.grc.nasa.gov/reports/1990/RP-1228.pdf
Is
there any particular reason you need something older?
Dave K. Adams, S.E.
Lane Engineers,
Inc.
Tulare, CA
-----Original Message-----
From: Rich Lewis [mailto:seaint04(--nospam--at)lewisengineering.com] Sent: Monday, October 02, 2006 2:53 PM To: seaint(--nospam--at)seaint.org Subject: RE: Stripping Treads Chuck, Yes, please do, since I
can?t find many other resources. Rich From: chuck utzman
[mailto:chuckuc(--nospam--at)pacbell.net] I could take a look in my Northrop Design Manual circa
1968 :o) is that prior enough? 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 tensile force is less than what would strip what is left of the threads
on the bolt. If 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 occurs midway between the peaks and valleys, it would be ½ the
perimeter area of the threaded section put in shear by the tension force on the
nut/bolt. I found a reference for a bolt guide in one of Harold S old
posts to a 1998 NASA RP-1228 ?Fastener 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 bolt. It makes sense to me. The equation is
P=(PI*DIA*Fs*L)/3 where DIA is the pitch diameter. It is written for yield
strength and ultimate tensile strength. I 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 report. Can anyone give me other references to analysis and
design of bolt thread stripping? Thanks. Rich |
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