Can Rebar be bent twice?
Can Rebar be bent twice?
(OP)
I have a contractor who bent a #5 bar 90 degrees and now needs to bend it back up. Does the bar undergo some diminished tensile capacity when bending it multiple times?
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RE: Can Rebar be bent twice?
Per ACI 318-05 section 7.3, bars can be bent once and only "cold bent".
RE: Can Rebar be bent twice?
RE: Can Rebar be bent twice?
Dick
RE: Can Rebar be bent twice?
I have attached ACI 318-05 section 7.3. For my learning, where it is written that rebars can be bent only once?
RE: Can Rebar be bent twice?
RE: Can Rebar be bent twice?
RE: Can Rebar be bent twice?
RE: Can Rebar be bent twice?
With reinforced concrete, ductility is is key. We need the bars to be able to yield without breaking. Bending the bar back and forth has already "used" some of this yielding. One bar, one time? Probably OK. But be careful how you give your answer. It is not uncommon for someone to interpret "it will be OK" as "it will be OK no matter how many times I do it, or in what circumstance."
RE: Can Rebar be bent twice?
RE: Can Rebar be bent twice?
RE: Can Rebar be bent twice?
RE: Can Rebar be bent twice?
You have taken the trouble to post this same question in the AS/NZ forum. If you are asking about Austalian conditions, read the anwers you have been given in that forum. The reinforcing material is different.
RE: Can Rebar be bent twice?
RE: Can Rebar be bent twice?
RE: Can Rebar be bent twice?
RE: Can Rebar be bent twice?
Regardless of what the code says about the grade 60 steel tests, I would be still be very leary of any cold bending without some preheating. Grade 40, no worries. Just my early training coming to light I guess.
Mike McCann
MMC Engineering
RE: Can Rebar be bent twice?
I found this story hard to believe and I'm not sure I do, but I wouldn't want to cold bend any bar at very low temperatures.
Best regards,
BA
RE: Can Rebar be bent twice?
RE: Can Rebar be bent twice?