Anchor bolts with no hook or bolted end-Concrete cone?
Anchor bolts with no hook or bolted end-Concrete cone?
(OP)
Pals
There are some cases where loading is very small and a nominal bolt size would be OK for even tension. Straight rods come handy then-being easier to fabricate in large number.
Literature discourages use of straight rods for tension and stops there without providing any strength analysis
Will such a rod develop a concrete cone? I mean can I go along and treat it as bolted with no bolt projection?
Or is there any reference text you can suggest?
respects
IJR
There are some cases where loading is very small and a nominal bolt size would be OK for even tension. Straight rods come handy then-being easier to fabricate in large number.
Literature discourages use of straight rods for tension and stops there without providing any strength analysis
Will such a rod develop a concrete cone? I mean can I go along and treat it as bolted with no bolt projection?
Or is there any reference text you can suggest?
respects
IJR





RE: Anchor bolts with no hook or bolted end-Concrete cone?
RE: Anchor bolts with no hook or bolted end-Concrete cone?
"Cast-in anchor - A headed bolt, a headed stud, or a hooked bolt installed before placing concrete."
As Willis notes, hooked anchors are discouraged for tension applications. AISC specifies that "hooked anchor rods should be used only for axially loaded compression members subject to compression only and prevent the displacement or overturning of columns due to erection loads...."
I would just add the nut. They're not that expensive.
RE: Anchor bolts with no hook or bolted end-Concrete cone?
But can you help me on how to design a straight anchor?Can a straight anchor develop a cone the way a bolted anchor does?I dont want to use a bolt at the end of the rod.
respects
IJR
RE: Anchor bolts with no hook or bolted end-Concrete cone?
Not to say that there won't be bond etc. developed - you just can't count on it. Personally I would not use a straight, non-deformed, non headed or nutted anchor rod to resist tension.
RE: Anchor bolts with no hook or bolted end-Concrete cone?
RE: Anchor bolts with no hook or bolted end-Concrete cone?
RE: Anchor bolts with no hook or bolted end-Concrete cone?
RE: Anchor bolts with no hook or bolted end-Concrete cone?
RE: Anchor bolts with no hook or bolted end-Concrete cone?
RE: Anchor bolts with no hook or bolted end-Concrete cone?
If you design such a rod using ACI bond lengths or similar , you end up with a flag post while Hilti and the like show up with their short magic wands.
Really a theory will help.
respects
IJR
RE: Anchor bolts with no hook or bolted end-Concrete cone?
To your original post: No, you can't develop a cone with a "straight" rod because there is no horizontal surface of the "head" or a "nut" to bear against the concrete. That's why there is no strength analysis.
In Chapter 13 of the 1963 ACI Code for buildings, there are formulas for computing the bond stress for deformed bars. The code also mentions that smooth bars have to be twice as long as required for deformed bars.
For epoxied-in bars, I believe most ICBO reports require special inspection. Check with Simpson Strong-Ties latest catalog and their Titen HD's. I believe that you can add install these anchors that will take a tension load.
I personally would not use straight bars for any tension loads.
RE: Anchor bolts with no hook or bolted end-Concrete cone?
RE: Anchor bolts with no hook or bolted end-Concrete cone?