Need a book? Engineering books recommendations...

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

RE: Q: COMPRESSION Force On Anchor Bolts/Rods

[Subject Prev][Subject Next][Thread Prev][Thread Next]
The behavior of a shear cone "downward" can be
expected to be different from a shear cone "upward".
In the upward situation, the cone propagates towards a
free surface

Rajendran
--- Neil Moore <nmoore(--nospam--at)innercite.com> wrote:
> Basically you design the compression rod the same as
> you design the tension
> rod.  You have to develop a shear cone downward.  If
> your anchor bolts have
> a nut at the bottom you would have to have enough
> material below the bolt
> to develop a shear cone.  On the other hand, if you
> insure that there is a
> nut at the top of the concrete that is in bearing,
> then you can start your
> shear cone from that point.  The difference is that
> now the compression
> load has to include the weight of structure which
> simply means that the
> anchor bolt is resisting more load in compression
> than it is in tension.
> 
> Many poles will have leveling nuts and questionable
> grout or no grout.  If
> the leveling nuts are left in place, then the
> compression load is going to
> be resisting by them and should be taken into
> account.
> 
> Neil Moore, S.E.
> neil moore and associates
> 
> 
> At 09:32 AM 12/12/2001 -0600, you wrote:
> >FWIW, I do not think that ACI 318, Section 12.3
> really applies. Note that it
> >mentions specifically "development of deformed bars
> in compression." A
> >smooth anchor rod is NOT the "deformed bar" by any
> stretch, IMO.
> >
> >Typically the "development length" of an anchor rod
> is not relevant in the
> >same way that ACI 318 defines development length.
> The smooth bar is
> >considered to have no significant contribution to
> the pullout capacity of
> >the anchorage.
> >
> >
> >
> >William L. Polhemus, Jr. P.E.
> >Polhemus Engineering Company
> >Katy, TX, USA
> >Phone (281) 492-2251
> >FAX (281) 492-8203
> >email bill(--nospam--at)polhemus.cc
> >
> >-----Original Message-----
> >From: Padmanabhan Rajendran
> [mailto:rakamaka(--nospam--at)yahoo.com]
> >Sent: Wednesday, December 12, 2001 8:36 AM
> >To: seaint(--nospam--at)seaint.org
> >Subject: Re: Q: COMPRESSION Force On Anchor
> Bolts/Rods
> >
> >Bill et al,
> >
> >This is what I do, when it comes to designing
> >anchorages in compression. Calculate the
> cevelopment
> >length required to transfer compressive forces per
> ACI
> >318, Section 12.3. I am comfortable with this
> approach
> >
> >
> >
> >******* ****** ******* ******** ******* *******
> ******* ***
> >*   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 
> ******* ****** ****** ****** ******* ****** ******
> ******** 


__________________________________________________
Do You Yahoo!?
Check out Yahoo! Shopping and Yahoo! Auctions for all of
your unique holiday gifts! Buy at http://shopping.yahoo.com
or bid at http://auctions.yahoo.com

******* ****** ******* ******** ******* ******* ******* ***
*   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 
******* ****** ****** ****** ******* ****** ****** ********