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msm15 (Mechanical) (OP)
22 Apr 10 11:12
Hi I need to find a book  that explains shop drawings for structural steel. We just got the drawings for our building but I am not familiar with a lot of terms. Is there a book that I can read that will explain some of this stuff.

All the connections are bolted - there will be no welding on the job. all the beams and columns are already cut we are mainly dealing with drilling the holes
slickdeals (Structural)
22 Apr 10 11:20
The AISC Steel Construction Manual would be a good place to start. Also you can look up AISC's website (

I am a little surprised/concerned that a mechanical engineer is reviewing structural steel shop drawings.
msm15 (Mechanical) (OP)
22 Apr 10 11:23
Haha - good point. Fear not - I am not reviewing them, they were already signed and stamped by our PE. I am just involved in ordering the steels and the fabrication.

The fact that I have an ME degree has little to do with my role here :)

connectegr (Structural)
22 Apr 10 11:42
AISC/NISD has a book Detailing for Steel Construction.  The newest version is Third Edition.  The Steel Construction Manual is more technical design information and less shop drawing vocabulary, standards, and symbols.  If you have some simple questions I can help or provide scans from the book.  But, if this is a new experience, I recommend getting the book.

msm15 (Mechanical) (OP)
22 Apr 10 12:10
Thanks for the link connectegr.

Below is a beam from one on the pages.

Starting from the lower left corner:

1-a9 = 1 a9 in this case its an L4x3-1/2x5/16 8-1/2 long  

NS/FS = Near Side and Long Side - what do those refer to ?

2-3/8 GOL - What does GOL stand for and what is 2-3/8 referring to ?

5-1/2 CC (Center to Center) - which centers ?

3-7/8x2-1/2 A325n - Bolt stuff, I know that info.

What is the hexagon with the 15/16x1-1/8 inside referring to ?

and what is the "IN OSL" ?

Next area is the top left where it says (-5-5/8) what are those numbers referring to ?

Then over to the top right it says (P/P 24-3) (-4 7/16) What are those numbers referring to ?

Thanks for your help much appreciated

connectegr (Structural)
22 Apr 10 12:17
NS/FS  - near side/ far side - an angle is located on each side of the beam web

GOL - gage of angle - the dimension from the heal of the angle to the center of the bolt hole.

Gage - center to center dimension between the columns of bolts.  

OSL - outstanding leg

15/16 x 1 1/8" - Short slot hole - probably horizontal

connectegr (Structural)
22 Apr 10 12:24
-5 5/8" - The dimension from the centerline of the column web to the face of the column flange.

P/P - point to point - centerline of column to centerline of column

-4 7/16 - same as above - must be a smaller column

connectegr (Structural)
22 Apr 10 12:59
I tried to blow this up

Note:  The actual dimension center of slot to center of slot is not exactly the Gage (5 1/2").  The holes in the column flange will be standard round holes a 5 1/2" c/c.  The slots are necessary for this difference.  Otherwise, a specific GOL would be required for every minor change in beam web thickness.  

Hope this helps.  

Are you having this fabricated by a structural steel fabricator?  Are the holes being located and drilled by a CNC beamline?  Or mag drilled one at a time?

msm15 (Mechanical) (OP)
22 Apr 10 12:59
Thank you very much  connectegr  excellent info.
paddingtongreen (Structural)
22 Apr 10 13:03
5 1/2" is a standard bolt gauge for flanges.

The Detailer must have a set of the job standards, there are variations between fab shops.

Timing has a lot to do with the outcome of a rain dance.

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