AISC 5th Edition

[KBVT]

I am investigating a building that was designed back in 1960. I am looking at a coverplated column with a 14WF320 designation. I have looked at the AISC 5th Edition which appears to be the governing AISC version at that time, and the section of the manual with the WF shapes does not include the 14WF320 shape. However, in the axial capacity tables, a single table is provided for axial capacity values of the 14WF320 column with differing cover plate sizes. In the straight axial capacity table, the 14WF320 column is included with a *core section* note with asterisk. Does anyone know what was special about this particular column section? I found the specific size in the AISC Iron & Steel Beams 1873-1952 book but I was curious as to why it appears that this column was not intended to be used without coverplates. Any info from some of the oldtimers would be appreciated.

One other thing - The column was indicated as ASTM A440 steel in the plans. Based on the column schedule, it appears that the cover plates were also intended to be A440 steel. Was plate stock available in the "high strength" A440 steel back then?

 

[JAE]

KBVT,

I have a copy of the 5th Edition and looked through it all. No commentary on what the "core" section meant. But speculating a bit I think it was simply a "vanilla" steel column section that allowed designers to place different cover plates on them.

So when the columns stacked up, at the splices you would have matching faces on the inside surfaces of the flanges and webs, allowing for easier detailing of splice plates and bolts/rivets.

So you would then have the freedom to design various sizes of columns without the mills having to roll lots of different shapes.

 

[msquared48]

The section is not mentioned in the second edition. I do not have a copy of the third edition. Perhaps someone else does.

Mike McCann
MMC Engineering

 

[msquared48]

Or the fourth...

Mike McCann
MMC Engineering

 

[KBVT]

Thanks for the replies. The only place I can find a mention of that column is in the AISC Iron & Steel Beams and in the 5th Edition. Really interesting that the base section properties are not included in the design tables but that column is the "core section" for the cover plate columns.

Any idea on the 5" thick cover plate steel? The column schedule just has a global A440 designation but the first time I can find the available steel grade is in the 7th Edition and 5" plate steel was A36 at that point. Does anyone have the 6th Edition? Can you check what the applicable ASTM Designation was for 5" plate stock? Thanks for all the help.

 

[msquared48]

I have the Sixth Edition too. That was ny text manual in college. On pages 3-13 thru 3-15 (A36), and 3-29 to 3-31 for A242, A440 and A441, the WF14X320 with cover plates is tabularized, but the cover plate thickness only goes up to 3.625".

It is interesting to note the typo on page 3-29 listing the core section as a 14WF820.

The plate girder top flange thicknesses only go up to 3" thick (pages 2-84 abd 2-85).

Mike McCann
MMC Engineering

 

[msquared48]

There are no cover plate tables in the Seventh Edition, nor any WF beams. The closest ones are W14X314 and W14X342.

Mike McCann
MMC Engineering

 

[SlideRuleEra]

msquared48 - W sections (7th Ed. & Later) are WF sections (6th Ed. & Earlier), only the nomenclature was changed. Simultaneously, however, various beam sizes were deleted and others added making the changes between Sixth Edition and Seventh Edition look more confusing than they are.

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