Hairpin Design

Hello DuneRider,

Hey, this may sound stupid but someone has to ask???////

What kind of hair pin do you refer? A pin for hair, or some other filter or microbiological hairpin?

This is to save on wasted searches as much as anything else.

Take care................................

By hairpin, I mean horizonatal reinforcing steel usually wrapped around column anchor bolts to provide resistance for horizontal column loading.

My intuition is that the area of steel provided by the hairpin (provided the proper developement length of the hairpin is acheived) should be enough to resist the horizontal load. However, a #3 hairpin could resist 13 kips under that assumption (pretty normal for an average metal building) but I typically see #5 hairpins that are 40' in length. So apparently there is some desire to spread tensile forces transferred to the slab across a much larger area than is dictated by simple developement length. Of course this could also simply reflect a desire provide a very large factor of safetly?

Here's a link from another Engineering Forum site that may help you.

http://www.eng-tips.com/viewthread.cfm?qid=225526

Good luck

Hello Guest,

I had to ask because a search for hairpin came back with so many sites. So it had to be narrowed a bit OK?

Are you the original poster?

I used to work for a company designing these foundations, and used a manual published by Butler manufacturing that was called "Foundation design and construction manual." (I called a friend who still works there, and he gave me the title.) This manual was an excellent reference, and explained the rationale behind extending the hairpins so far (and yes, it had to do with ensuring adequate slab resistance prior to terminating the bar.). Anyway, I have searched a little and found nothing about this manual, which is too bad, I would like a copy for myself as well. This may point you in a direction that works, if you locate this let me know!

-Y/E

Hello yoderengineering:

Is this it?........Let me know if it is. I list here the seach page I found it with including filters:

http://www.google.com/search?hl=en&q=Foundation+design+and+construction+manual+Butler+manufacturing&btnG=Search

"Foundation Design and Construction", Butler Manufacturing Company ... "Hollow Core Slab Design Manual", Prestressed Concrete Institute. Building Design ...
www.csd-eng.com/CO-Story.html - 13k

Take care......................

This manual, while dealing specifically with designing foundations in Hong Kong is an interesting read if nothing else.

Thanks

Hello DuneRider:

Sorry it was not the correct one. But it is a name I have written down and in my head and will continue to keep a look out when searching.

There does seem to be an awful lot of 'Butlers' in similar design situations. Is it possible you can give me the full name and works and or other address please? At least, if I can link a 'Butler' to a certain town or area it will save time.

Take care and thanks for the courtesy of the reply!

Babybear, you are really good at finding things! A real asset to this site and all of us who use it.

That manual must be out of print. I have searched the sites I usually find stuff like that at, and so far no luck (used books, etc.) This may not show up in those places as it is really a thin manual, but was quite good. I will keep my eyes open, however it seems that there must be other sources available.

Thanks! -Y/E

Hello yoderengineering:

Can you tell me where Butler Engineering was/is and the are address please? I have found 6 copies of a book with the same name in Libraries across the US. This is just one Library. Can you confirm if the full company name was as listed below please?

Is there a detail you recall , such as the colour and size/number of pages? Was the cover plain or not. Was the cover printed in black?

Details I have:

Your session will expire in .

If you can confirm the details I can try each Library up to the Library of Congress for details then I can search for possible copies.

Take care..........................

The search was easy,

I found this at Barnes and Noble so this may be of more specific help

Regards, CJM

Hello CJM,

Sorry my friend, but they did not have the right book. Lots of handbooks, but not the right one. Appreciate you looking though!

Take care.....................

In the synopsis about the contents it lists

"* Explains critical considerations for MBS foundations not covered in manufacturers' specifications
* Includes several new design examples dealing with selection of primary framing, preliminary design of purlins, girts, and eave struts, design of moment-resisting building foundations, plus a comprehensive case study of additions to existing buildings"

Is this not the discussion thread in a nut-shell? I must have missed some detail, sorry, & thanks for having my back. CJM

Hello CJM,

I agree, it is the thread in a nutshell, but it is not the book I am after. The searches I have tries brought back the book or one with the same name in six different Uni's. When I posts my results I was told it was not the same Foundation book as they were after. As far as I know they have not posted any other details I asked for and I need them to be able to qualify the book and the writers of it.

There seems to be a lot of 'Butlers' out there writing Foundation books! I think the Butler company may have gotten taken over and the new people are now listed as the 'owners' of the Foundations book?

I can't do any other search until I am told the exact address of the firm and the exact name of the person including first names.

Really appreciate your post though. It is getting a little frustrating not be get a reply to my questions though!.......Not from you but by the person who asked near the start of the thread.

Take care....................

babybear et al,

I really appreciate the help in locating the reference I would need to point me in the right direction. I must say however, that I would not be able to site the book you have searched for in any of my calculations. I would really need to be able to site a source such as ACI or AISC etc. This must be something that has been covered in one of thier commentaries or papers. I have a number of text books on foundation design and none of them cover this subject. I wonder if perhaps, instead of refering to hairpin design specifically, this topic is covered under developement length and is just a natural extension of that discussion?