Mixing A706 and A615 Rebar
Mixing A706 and A615 Rebar
(OP)
Is it standard practice in high seismic regions to specify A706 rebar only or do you only specify A706 at ductile elements and use A615 everywhere else. If you do mix rebar, how is it delineated as different in the field other than standard bar markings that are not going to scream that this rebar is different?
thread507-226454: A706 rebar required for seismic?
thread507-226454: A706 rebar required for seismic?






RE: Mixing A706 and A615 Rebar
We do not encourage use of A706 elsewhere because of the limited availability of certain metals, such as vanadium, used in chemical grain refinement (the usual means of achieving greater ductility in rebar and structural steel.)
The other aspect of A706 which is important to seismic application is a cap on the upper bound of yield strength. Right now, A706 limits the strength to 18 ksi over the nominal value.
RE: Mixing A706 and A615 Rebar
I want to verify to make sure I understand your post. You would specify A615 with the specific requirements (actual yield no more than 18,000 psi above specified fy, and ratio of actual tensile strength to actual yield strength not less than 1.25) vs. specifying A706. You would do this for all bar, not just at ductile elements. Is this correct?
RE: Mixing A706 and A615 Rebar
RE: Mixing A706 and A615 Rebar
The supplier or contractor can then request a variance to use A615 with the appropriate properties, in lieu of A706.
RE: Mixing A706 and A615 Rebar
RE: Mixing A706 and A615 Rebar