Historic Steel Shapes I12x31.8

[nmcbride]

I can not find any info for an I12x31.8. I've found a reference in an old book but know what any of the properties are! Please help

 

[woodman88]

According to my "Data Book for Civil Engineers,3rd ed." 1960? page 4-03

American Standard Beam Section

D, Wt, S, t, Lu, V, R, G, d, b, t', r'

I12, 31.8, 36.0, 0.35, 11.5, 55, 39, 8.4, 12, 5, 0.54, 1.01

Garth Dreger PE - AZ Phoenix area
As EOR's we should take the responsibility to design our structures to support the components we allow in our design per that industry standards.

 

[CANPRO]

click the link to historic properties at the bottom of the page....there is a spreadsheet with a ton of properties of different sections. There is an S 12x31.8, which I think is what you're looking for.

http://www.aisc.org/content.aspx?id=2868

 

[nmcbride]

@woodman88

I got a Ix=218

A=9.35

d=12.00

tw=0.350

bf=5.000

tf=0.544

Does this jive with whats in your book?

 

[woodman88]

Wt = 31.8 (weight of beam plf)
S = 36.0 (Section modulus)
t =0.35 (web thickness inches)
Lu = 11.5 (maximum length @ 20,000 psi with unbraced comp. flange)
V = 55 (maximum web shear in kips for 13000 psi)
R = 39 (allowable end reaction for 3.5" bearing)
G = 8.4 (increase in R for 1" additional bearing)
d = 12 (actual depth inches)
b = 5 (flange width inches)
t' = 0.54 (flange thickness inches)
r' = 1.01 (least radius of gyration)

Which appears to match your data.

Garth Dreger PE - AZ Phoenix area
As EOR's we should take the responsibility to design our structures to support the components we allow in our design per that industry standards.

 

[nmcbride]

Thanks Woodman88?

 

[BAretired]

How old is the beam? Is it steel or wrought iron?

BA

 

[CANPRO]

FYI - The properties you have listed are pretty much indentical to the modern S12x31.8

 

[msquared48]

In my 1956 edition of the Steel Constructiion Manual, the values are as follows for a 12I31.8:

A = 9.26
d = 12.00
bf = 5.00
tf = .544
tw = .35
Ixx = 215.8
Sx = 36.0
rx = 4.83
Iyy = 9.5
Sy = 3.8
ry = 1.01

The values were the same in the 1934 manual too. Do you have any idea of the year of construction?



Mike McCann
MMC Engineering

http://mmcengineering.tripod.com

 

[dik]

CANIET... the I Section name was revised to the S Section many years ago... many rolling mills occasionally had slightly different section properties.

Dik