Threaded Rod in Canada

[charliealphabravo]

I need to specify threaded rod for a base plate anchor rod (epoxy retrofit). Can someone direct me to a spec for the Canadian equivalent of F1554 Grade 36? I will be using 3/4" and 1" diameter rods.
Thanks in advance.

 

[ajh1]

The Canadian codes generally recognize ASTM material designations. You should be able to just ask for F1554.

 

[BAretired]

How does it differ from ASTM A307? Or does it differ at all?

BA

 

[ajh1]

The Grade 36 is a close equivalent to either A307 or A36. I believe they are generally used interchangablely.

 

[TXStructural]

ASTM F1554 can be specified as 36, 55, or 105 ksi yield. This is THE spec for threaded rod. Use this one.

A307 is for 60 ksi tensile. A307 grade B can be grade 60 or 100, but is not generally available as threaded rod, and A307 grade C was replaced by F1554. Do not use this for threaded rod.

 

[charliealphabravo]

Thanks all.

It looks like the threaded rod will need to be stainless steel. I don't see a Canadian spec for stainless threaded rod in S16. What would you guys do?

Galvanized may also be acceptable but this can result in the galvanizer oversizing the nut threads.

 

[dik]

I use the following spec (from my drawing General Notes:

U/N 3/4"%%C ANCHOR RODS SHALL BE FABRICATED FROM ROUND BAR x [20" | 24"] LONG. THE BOTTOM OF THE BAR SHALL HAVE A 1" LONG UNC THREADED PORTION TO ACCEPT A HEAVY HEX HEAD NUT WELDED AT THE BOTTOM WITH 1/4" FILLET WELD 3/4" LONG. THE TOP OF THE BAR SHALL HAVE A 4" LONG UNC THREADED PORTION TO ACCEPT A HEAVY HEX HEAD NUT, AND
WASHER. EMBEDMENT LENGTH SHALL BE 19" MIN. LENGTH OF PROJECTION SHALL BE 4".

ANCHOR RODS SHALL BE ASTM F1554, GRADE [55-S1 | 105 (NOT WELDABLE)]. NUTS AND WASHERS TO MATCH

I've had no difficulty in getting the material and have used it numerous times in Canada. Use Grade 55-S1, because this is weldable... At times it's really handy to have weldable anchor rods.

Dik

 

[dik]

Stainless steel anchor rod notes

STAINLESS STEEL ANCHOR RODS

ALL ANCHOR RODS SHALL BE 3/4"%%C

ANCHOR ROD WASHERS SHALL CONFORM TO ASTM A240 AND NUTS SHALL CONFORM TO ASTM A194, GRADE 8M U/N

ANCHOR RODS LESS THAN 1"%%C SHALL CONFORM AISI 316L HAVING A MIN FY = 30 KSI (210 MPA) AND A UTS = 70 KSI (480 MPA) OR APPD EQ. NUTS AND WASHERS TO MATCH

ANCHOR RODS DENOTED AS 1"%%C OR LARGER SHALL CONFORM AISI 2205 AND ASTM A276 HAVING A MIN FY = 61 KSI (420 MPA) AND A UTS = 90 KSI (620 MPA) OR APPD EQ. NUTS AND WASHERS TO MATCH

In the previous post, ignore the 20" long bar length...

Dik

 

[fel3]

As part of my research for a recent project, I came across this commentary about threaded rod on the Portland Bolts website:

http://www.portlandbolt.com/faqs/f1554-grade-36-all-thread-rod/

I also found a comment somewhere (I'll be darned if I can find it right now) that a threaded rod with heavy hex nut has about 85% the capacity of a heavy hex head anchor of the same nominal diameter because the threaded rod has a smaller cross-section at the base of the threads than does the anchor with integral heavy hex head.

==========
"Is it the only lesson of history that mankind is unteachable?"
--Winston S. Churchill

 

[TXStructural]

For threaded bolts and rods, there are tables showing the net tensile area for the fasteners.
For 3/4" course thread, As=0.335 sq. in. (computed nominal area would be 0.442 sq. in., a 24% reduction)
For 1" course thread, As=0.606 sq. in. (computed nominal area would be 0.785 sq. in., a 23% reduction)
These values will correspond to the limiting tensile capacity for a given grade, and apply to both the embedded end and the business end onto which you affix your baseplate and nut. There is no reason to get fancy, and if you are designing for the net tensile area of the threaded portion (as required), use what is available, either all-thread or fabricated anchor rods. For carbon steel, the extra section of the unthreaded rod is valuable when corrosion could compromise the cross section of the rod over time.