grade 60 stirrups experience
grade 60 stirrups experience
(OP)
In field experience, do you find grade 60 stirrups more brittle? Is this recommended to use for ties and stirrups?
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grade 60 stirrups experience
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RE: grade 60 stirrups experience
BA
RE: grade 60 stirrups experience
RE: grade 60 stirrups experience
I heard there are different bending requirements for grade 40 and grade 60 stirrups in actual implementation in constructions. My experience is mostly on grade 40 stirrups although I mixed it with grade 60 longitudinal bars. I have never used grade 60 stirrups. What changes in actual implementation would I have to expect (in bending it for example.. is it harder and more brittle to bend)?
RE: grade 60 stirrups experience
RE: grade 60 stirrups experience
RE: grade 60 stirrups experience
Dik
RE: grade 60 stirrups experience
Do not specify bends tighter than ACI/CRSI stirrup minimums under any case. Bars cannot be reliably bent to tighter radii and still perform properly. Also, for standard hooks, the limiting factor for bend radius is often not bar ductility but concrete performance inside the bend.
Interestingly, in-ground pool crews and other people who hand form bars really prefer grade 40 so they can easily bend them. DO NOT use that excuse for structural uses, since all structural bars should be fabricated in a shop (either at a plant or using on-site equipment, not hand benders.) The level of quality control needed to assure a safe, constructible structure demands observance of proper bends and tolerances.
As for cold brittleness, it happens with all carbon steels to one degree or another. It is seldom a factor in a completed structure.
RE: grade 60 stirrups experience
Dik
RE: grade 60 stirrups experience
What could be the hidden harm of combining grade 60 longitudinal (6mm) bars and grade 40 (3mm) stirrups? Is it recommended all have the same grade 40 or grade 60? We ran out of stock of grade 60 stirrups and plan to use grade 40 stirrups in combination grade 60 main bars beams. Any subtle disadvantage I may not be aware of?
RE: grade 60 stirrups experience
BA
RE: grade 60 stirrups experience
We will of course adjust the spacing to accomodate grade 40 stirrups instead of grade 60. I assume there is similarly no hidden problem in using column grade 40 ties with grade 60 main column bars assuming the spacing is recalculated. Correct?
RE: grade 60 stirrups experience
Conversely, beam stirrups carry diagonal tension, so stirrup spacing is related to the tensile strength of each stirrup.
BA
RE: grade 60 stirrups experience
Problem with grade 60 ties is if the corner bends are brittle and the crews install it without double checking.. so there is advantage in using grade 40 instead of grade 60 column ties... Has anyone here actually make it a point to choose grade 40 instead of grade 60 column ties since the yeild strength is not important?
RE: grade 60 stirrups experience
RE: grade 60 stirrups experience
sorry.. typo... i mean 20mm bar which is 6" approximately...
RE: grade 60 stirrups experience
RE: grade 60 stirrups experience
lol.. another typo. I mean #6, not 6".. it's just that I often use millimeter like 20mm and never use #6 in bars
RE: grade 60 stirrups experience
I did that for a long time, then found that Grade 60 was being supplied in lieu of Grade 40, the supplier believing that he had provided a better product than the one specified. I am not sure how long that condition prevailed, but I don't believe it is a concern now.
BA