ASCE 7-05 - Standard Hole Size 2

[cgstrucg]

Hello,

This question is about the standard bolt hole sizes. In usual scenarios, we say that bolt hole size shall be dia. of bolt + 1/16". But in the submittal I have, the contractor is using bolt hole sizes as dia. of bolt + 1/16" + 1/16". Does someone know if we can add 1/16" twice and where is the reference for it in ASCE 7-05.

I know this sounds like a small issue but we have many other issues in a 600-page submittal so we want to give contractor a clear guidance with reference so that they can clean the package.

Thanks for the help.

 

[dik]

First I've heard of it... I think the AISC has opened up the 'slack' for 1" fasteners, a bit... but, not sure.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Do you feel any better?

-Dik

 

[Ingenuity]

AISC not ASCE. Depends on the bolt diameter. 1/16" up to 7/8" dia, and 1/8" for 1" and above for STD holes.

From AISC 360-16:

 

[DrZoidberWoop]

You should ask the contractor who wrote that particular spec what their intention was.

The nominal standard hole diameter is typically taken as bolt diameter + 1/16" (This was updated to +1/8" for bolts >= 1" diameter in AISC 15th/RCSC2020). Your fabricator is likely going to work to shop drawings w/ holes per AISC Table J3.3 anyway.

In some cases, another 1/16" can be taken into account for structural calcs for field reaming during joint assembly.

 

[cgstrucg]

My bad it's AISC 13th, I agree with 1 1/8" bolts but they are doing the same for 3/4" that's why I was a bit confused. I think they just messed up. Thank you for the help and instant responses.

 

[JLNJ]

In the past, detailers would use 1/8" oversized holes for galvanized material, presumably because the zinc narrows up the hole. I believe AISC does not condone this practice.

Fully-pretensioned bolts can sometimes be used with 1/8" oversized holes. Check with the EOR about the design intent.

Or maybe it's just an error.