www.sefindia.org

[jatfuentes]

Dear Sefians,

We have a problem in our company. The constructor made a mistake with the projection length over the concrete
of the anchor bolts in a big foundation. The length of the bolts are short of necessary, and now they want to
weld a piece of bolt in order to get the right length. The Anchor bolts have a diameter of 2" and the material
is SAE 1020.
Any of you have experience with this problem?. I will like to hear your experiences or ideas.
Any advice will be welcome.

With regars,
Jatfuentes

Posted via Email

[Dr. N. Subramanian]

Hi Jatfuentes,

These kinds of problems often arise in construction. Once I was shocked to find a contractor using gas torches for enlarging the holes, as the drilled holes did not match at the site! If the forces applied on the base plate are Compressive, no problem in increasing the length by welding. But if they are Tensile, you have to take precautions.
Regards
NS

Dr.N.Subramanian,Ph.D.,F.ASCE, M.ACI,

Consulting Structural Engineer
Maryland, USA

See my books at: www.multi-science.co.uk/subramanian-book.htm
www.oup.co.in/search_detail.php?id=144559





--- On Wed, 1/7/09, jatfuentes <forum@sefindia.org> wrote:

[jatfuentes]

Thank you Dr Subramanian,

Your advice make to much sense, because theoretically anchor bolts are necessary only for uplift forces. I will
check with the engineer if there is uplift in his structure or if these anchor bolts are compressed.

Again,
Thanks


---------- Cabeçalho original -----------

De: "drnsmani" forum@sefindia.org
Para: general@sefindia.org
Cópia:
Data: Wed, 07 Jan 2009 20:56:15 +0530
Assunto: [SEFI] Re: Welding Anchor Bolts

[anurag.sinha]

Dear Jatfuentes  

In addition to tension (case specific) there has to be some shear force also (wind/ seismic). Therefore my advise would be to check for combined forces, which is more critical.

Regards,

Anurag Sinha

From: jatfuentes [mailto:forum@sefindia.org]
Sent: 07 January 2009 21:59
To: general@sefindia.org
Subject: [SEFI] Re: Welding Anchor Bolts



Thank you Dr Subramanian,

Your advice make to much sense, because theoretically anchor bolts are necessary only for uplift forces. I will
check with the engineer if there is uplift in his structure or if these anchor bolts are compressed.

Again,
Thanks


---------- Cabeçalho original -----------

De: "drnsmani" forum@sefindia.org (forum@sefindia.org)
Para: general@sefindia.org (general@sefindia.org)
Cópia:
Data: Wed, 07 Jan 2009 20:56:15 +0530
Assunto: [SEFI] Re: Welding Anchor Bolts    
--auto removed--

Posted via Email

[vikram.jeet]

Dear  Mr Jatfuentes

I think by Butt- welding the piece of anchorbolt with already embeded  
AnchorBolt , you may not achieve the desired tensile strength

In addition to this, it will be more effective if the embeded Anchor bolts
shall be Fillet-welded with the base plate after its positioning (at site)  
to provide additional strength against tensile forces due to uplift

regards

vikramjeet

Posted via Email

[ibarua]

9TH JAN 2009

In case of tensile forces on the bolts, a solution may be to provide a 'cover' or 'sleeve' over the butt welded joint and then weld the 'sleeve' to the bolt, taking care not to damage the threads which will hold the nuts in place. Also, the question of loss of strength /increase in brittleness of the bolts due to heating during the welding process has to be considered.

Indrajit Barua.  

On Wed, 07 Jan 2009 drnsmani wrote :

[Dr. N. Subramanian]

Dear Mr.Jatfuentes,
The following solution suggested by Mr.Indrajit Barua is the best one for you to adopt, whether the anchor bolt is in tension or compression.

Regards
NS

Dr.N.Subramanian,Ph.D.,F.ASCE, M.ACI,

Consulting Structural Engineer
Maryland, USA

See my books at: www.multi-science.co.uk/subramanian-book.htm
www.oup.co.in/search_detail.php?id=144559





--- On Thu, 1/8/09, ibarua <forum@sefindia.org> wrote:
[quote]From: ibarua <forum@sefindia.org>
Subject: [SEFI] Re: Welding Anchor Bolts
To: general@sefindia.org
Date: Thursday, January 8, 2009, 10:32 AM

9TH JAN 2009

In case of tensile forces on the bolts, a solution may be to provide a 'cover' or 'sleeve' over the butt welded joint and then weld the 'sleeve' to the bolt, taking care not to damage the threads which will hold the nuts in place. Also, the question of loss of strength /increase in brittleness of the bolts due to heating during the welding process has to be considered.

Indrajit Barua.

On Wed, 07 Jan 2009 drnsmani wrote :
      --auto removed--

Posted via Email

[jatfuentes]

Thanks, Dr. Subramanian, Thanks Mr. Indrajit Barua and all friends that sent ideas,

It is exactly what a I did. I used a butt weld and a sleeve welded to the anchor bolt. The pipe (sleeve ) I
used is SAC 50, of better quality than the anchor bolt( SAE 1020).
In other e-mail I will send the detail of the anchor bolt splice for future reference.

Regards,
jatfuentes






---------- Cabeçalho original -----------

De: "drnsmani" forum@sefindia.org
Para: general@sefindia.org
Cópia:
Data: Thu, 08 Jan 2009 21:34:02 +0530
Assunto: [SEFI] Re: Welding Anchor Bolts

[pravin.pai]

Dear Mr Barua:

I did not understand this solution. After he provides the sleeve over the joint, how can they screw the nut over it?

regards
ppai



On 1/8/09, ibarua <forum@sefindia.org (forum@sefindia.org)> wrote: [quote]  9TH JAN 2009

In case of tensile forces on the bolts, a solution may be to provide a 'cover' or 'sleeve' over the butt welded joint and then weld the 'sleeve' to the bolt, taking care not to damage the threads which will hold the nuts in place. Also, the question of loss of strength /increase in brittleness of the bolts due to heating during the welding process has to be considered.

Indrajit Barua.

On Wed, 07 Jan 2009 drnsmani wrote :
--auto removed--

Posted via Email

[ranna]

the anchor bolt can definitely be welded.
for welding requirement kindly contact
welding research institute
bhel,
trichy 620014
phone 0431 2520266
r.anna
ranna@bheltry.co.in (ranna@bheltry.co.in)

jatfuentes wrote: