Need a book? Engineering books recommendations...

Return to index: [Subject] [Thread] [Date] [Author]

RE: Stripping Treads

[Subject Prev][Subject Next][Thread Prev][Thread Next]
What I meant was prior to NASA 1228 report.  And Dave Adams was right; it's
1990, not 1998.

The reason I ask this is I know this is a problem that was solved decades
ago, yet I can't find it addressed in typical steel design literature.  I
guess I have always taken for granted the nut will not strip off and never
investigated the thread strength.  Now that I have to deal with a problem
I'm finding it hard to find design literature.  I don't doubt the NASA
research is valid, but since it's not typical building design standards I
was looking for something that has been proven relevant to the industry.

I don't have access to "The Distribution of Load on the Threads of Screws",
Journal of Applied Mechanics, March 1940.  It's not available on ASME web
site.  What is the approach they use for evaluating the strength of a
threaded connection?

Thanks for your help.

Rich


-----Original Message-----
From: Harold Sprague [mailto:spraguehope(--nospam--at)hotmail.com] 
Sent: Monday, October 02, 2006 6:05 PM
To: seaint(--nospam--at)seaint.org
Subject: RE: Stripping Treads

Prior to the NASA?

Goodier, "The Distribution of Load on the Threads of Screws", Journal of 
Applied Mechanics, March 1940.

Regards,
Harold Sprague





>From: "Rich Lewis" <seaint04(--nospam--at)lewisengineering.com>
>Reply-To: <seaint(--nospam--at)seaint.org>
>To: <seaint(--nospam--at)seaint.org>
>Subject: RE: Stripping Treads
>Date: Mon, 2 Oct 2006 16:52:54 -0500
>
>Chuck,
>
>
>
>Yes, please do, since I can?t find many other resources.
>
>
>
>Rich
>
>
>
>
>
>   _____
>
>From: chuck utzman [mailto:chuckuc(--nospam--at)pacbell.net]
>Sent: Friday, September 29, 2006 3:34 PM
>To: seaint(--nospam--at)seaint.org
>Subject: Re: Stripping Treads
>
>
>
>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 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
>
>
>

_________________________________________________________________
Search?Your way, your world, right now!  
http://imagine-windowslive.com/minisites/searchlaunch/?locale=en-us&FORM=WLM
TAG


******* ****** ******* ******** ******* ******* ******* ***
*   Read list FAQ at: http://www.seaint.org/list_FAQ.asp
* 
*   This email was sent to you via Structural Engineers 
*   Association of Southern California (SEAOSC) server. To 
*   subscribe (no fee) or UnSubscribe, please go to:
*
*   http://www.seaint.org/sealist1.asp
*
*   Questions to seaint-ad(--nospam--at)seaint.org. Remember, any email you 
*   send to the list is public domain and may be re-posted 
*   without your permission. Make sure you visit our web 
*   site at: http://www.seaint.org 
******* ****** ****** ****** ******* ****** ****** ******** 



******* ****** ******* ******** ******* ******* ******* ***
*   Read list FAQ at: http://www.seaint.org/list_FAQ.asp
* 
*   This email was sent to you via Structural Engineers 
*   Association of Southern California (SEAOSC) server. To 
*   subscribe (no fee) or UnSubscribe, please go to:
*
*   http://www.seaint.org/sealist1.asp
*
*   Questions to seaint-ad(--nospam--at)seaint.org. Remember, any email you 
*   send to the list is public domain and may be re-posted 
*   without your permission. Make sure you visit our web 
*   site at: http://www.seaint.org 
******* ****** ****** ****** ******* ****** ****** ********