Bolt Edge Distance

[DWHA]

Different edge distances are allowed depending on what type of edge is present on the steel (per AISC, AASHTO, AREMA, etc.). There are 2 classes, 1 is rolled or thremally cut, the other is sheared. My question is what about edges that have been sawed. To me sawing steel would be the same as rolled and thermally cut because the damage to the steel is not like when the steel is sheared, but that is just my guess. What do others allow/think......

 

[Lion06]

I would agree.

 

[csd72]

Sounds reasonable to me.

 

[apsix]

The above advice is not correct if you are in Australia where our code, AS4100, has 3 classes. A rolled edge is in its own class.

 

[DWHA]

apsix

Is thremally cut in the same class as sawed then?

 

[HgTX]

If I had to guess, I'd put sawed in the same category as rolled edges. There are concerns about microcracking in sheared edges and hardening of thermal-cut edges, neither of which apply to sawed edges. (And in the U.S. codes they decided there was no longer sufficient concern about the TCEs to classify them in with the sheared edges, so now they're in with rolled.) However, the end of a saw cut might be ragged and subject to the same concerns as sheared edges.

On the other hand, it could be argued that saw-cutting is a form of shearing. I'm inclined not to argue that, but I could be persuaded.

Hg

Eng-Tips policies: faq731-376

 

[apsix]

DWHA, HgTX

The 3 classes by AS4100;
1. sheared or hand flame cut
2. machine flame cut, sawn or planed
3. rolled edge

With edge distances equal to 1.75, 1.5 & 1.25 x bolt dia respectively.