HIGH STRENGTH ANCHOR BOLTS

[ron9876]

Does anyone know where I can find the allowable capacity of anchor bolts. I haven't bought the new AISC code yet and I live in concrete country so don't get into many situations where this tyoe of material is needed

 

[WillisV]

ACI Appendix D has provisions for anchor bolt strength.

 

[ron9876]

Thanks but I was referring to the capacity of anchor bolts with the "F" designation--I need to size some anchor bolts with high tension loads--by the way I find the PCI method for concrete capacity of embeds easier to work with than the ACI method

 

[WillisV]

the PCI method in the new edition manual is almost identical to that of the Appendix D method...you must be referring to the older PCI methods...

 

[ron9876]

no the new method--for me the presentation is easier to follow and use

 

[UcfSE]

I think I missed something. You asked about how to determine anchor bolt capacity but you already have a preferred method for doing so? What exactly is your question?

 

[ron9876]

I am looking for the capacity of the steel for the "F" designation anchor bolts

 

[UcfSE]

Would you mind elaborating on that? I'm not familiar with the term "F" achor bolts.

 

[ron9876]

AISC introduced a new designation for anchor bolts a while back. If I am not mistaken they use a F before the bolt designation. My problem is that I don't have the info for these bolts.

 

[JStephen]

Read through this post for some information that may be helpful:

http://www.eng-tips.com/viewthread.cfm?qid=153089&page=2

It looks like ASTM F1554 is what you're thinking of.

You can download these ASTM specs for a fee if you need the information in it.

In the ACI-318 design method, one of the limitations on the anchors is the strength of the anchor itself- based on the ultimate strength of the anchor material. So knowing the anchor material and ACI-318, you may not need anything else.

 

[ron9876]

yes I found the ASTM specs but I wasn't able o find allowable shear and tension stress for the different grades

 

[DRC1]

Try Portland Bolt Co.

http://www.portlandbolt.com/technic...M_F1554.html?gclid=CJvmlNSc6IcCFUBzGgodBmd0ig

I'm sure you can also call and they will help

 

[UcfSE]

You choose the grade you want from three choices: 36, 55 and 105 (yield strengths). You may find more information at the link provided by DRC1. When you design anchor rod strength or anchor group strength with ACI 318 appendix D, part of the equations you must check include a steel strength check. That is where you find the capacity of the steel. The ACI covers both the concrete and steel. Perhaps you overlooked that part.

 

[ron9876]

Must not have explained myself clearly--very familiar with the concrete side of the calculation--was looking for the grades and strengths of the steel--the Portland Bolt site was what I was looking for--thaks

 

[samdamon]

Ron

Fyi in my area lead time for obtaining the highest strength (Fy=105 ksi) rods is six weeks +-. (Found this out the hard way when designing a fix for some ab problems on a new building). Suggest you check how available they are before you specify a higher strength rod. Regards

 

[WillisV]

Sandamon...next time check out ASTM A193 Gr B7 rods...They are generally available and are the chemical equivalent of F1554 GR105s...this substitution is allowed per AISC

 

[unclesyd]

WillisV is right on top of the GR105 supply problem. I talked with my fastener buddy this morning and his first statement was why use GR 105s when B7 is available and will generally be cheaper. His time was about 3 weeks for 105s while B7 is essentially off the shelf. About 75% of quotes for Gr105 end up being B7

He did mention one other thing is that several of his customers are using fluorescent orange for the 105s and some are using it on B7s.