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Re: Structural Steel Section Properties

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A great reference for obsolete shapes is "Iron and Steel Beams 1873 to 1952,"
published by AISC.  I believe that it's still in print.  I have the sixth
printing from 1973.

For a 12B25, there are three different listings for steel rolled between 1927
and 1931.  Two of the listings give values of the section properties that are 1
to 2% less than those given by John Riley.  Not a big deal, I just thought that
you may like a reference to cite, to justify your calculations.

Evan Jorgensen

--John Riley wrote:

I believe the beams are Bethlehem Beams and should have been designated with
a "B" rather than an "I".

12B25  A 7.44  Ix 185.1  Sx 31.16  rx 4.99  Iy 13.6  Sy 4.19  ry 1.35  d
11.88  b 6.495
            Mmax = 560,900 in-lb

15B36  A 10.61  Ix 410.9  Sx 55.12  rx 6.22  Iy 21.7  Sy 6.45  ry 1.43  d
14.91  b 6.740
            Mmax = 992,100 in-lb

16B50  A 14.78  Ix 669.0  Sx 82.34  rx 6.73  Iy 36.6  Sy 10.01  ry 1.57  d
16.25  b 7.320
            Mmax = 1,482,100 in-lb

AISC specs:

    On extreme fibres of rolled shapes, and built up sections, net section,
if lateral deflection is prevented . . . 18,000 psi
    When unsupported length exceeds 15 times b, width of compression flange

Shear.  12000 psi

John P. Riley, PE, SE
Riley Engineering
20 Oakwood Drive, Blue Grass, Iowa 52726
Tel & Fax:  319-381-3949

----- Original Message -----
From: Alicia Danyeur <aliciad(--nospam--at)>
To: <seaint(--nospam--at)>
Sent: Monday, October 16, 2000 6:44 PM
Subject: Structural Steel Section Properties

> Hello,
> I need some help finding the section properties for the beams and
> girders in an existing building. The blueprints we have are dated Feb
> 1930. The latest AISC Manual in the office is from the 1950's and
> doesn't have the sizes as they are called out on the drawings. The
> blueprints read beams being 12" I -25# and the girders as 15" I -36# and
> 16" I -50. Any information and or help would be greatly appreciated.
> Thanks in advance,
> Alicia Danyeur, EIT
> Teter Consultants, LLP