The threading is being provided as an extra measure of rigidity and to match tested/posted bond strength values (in this case, from Hilti). They have not tested smooth rod epoxy anchored to concrete.
MotorCity, I think confusion over ASTM grade is likely on the part of the contractor.
I found that A36 is acceptable, so I will probably stick with specifying it as the substitution. But, for future reference...what I require is a smooth rod that can be threaded. So one end is threaded (end...
UBGrad, I did reference Table 2-5 in AISC 13th for the design. If you look at A572 Grade 50 for the application of threaded rods, it states that there is "other applicable material specification". I don't believe this means that the product doesn't exist, but I interpret it to mean that it just...
I did a little more research on this and came to the same conclusion. I have never seen a Grade 50 option for A36, so not sure where the contractor got it from.
You're right that it's likely that the actual yield strength of A36 is higher than 36 ksi, but we must always assume the minimum...
I am about to finalize drawings for a project where I have specified the use of ASTM A572 Grade 50 rods. The rods are partially threaded and epoxy anchored into an existing concrete structure and has a smooth, greased body to be embedded in new concrete. The purpose of the rod is to provide...
Thanks for your input Rainbowtrout. I did include Mxy in my design after doing significant research, along with your recommendations, and determined it was prudent to include it.
On the 2nd item regarding STAAD's visual output, I did find a Bentley forum that explains how to view stress...
Thanks WARose.
The shear stress I'm seeing does increase as the thickness decreases. This makes sense because you end up multiplying the shear stress by the slab thickness to get shear force. My point was that I saw a sharp decrease in shear force as the thickness decreased, signifying to me...
Hello All,
First time posting on Eng-Tips, but I've been using the forum as a resource for many years. I am working on a fairly complicated finite element model using quadratic and triangular plate elements. I am at a point where I am comfortable with the model results given the geometry and...
