old beam sizes
old beam sizes
(OP)
i have some old beams (from early 1900's)which i have the measurements but do not know the sizes. could anybody help me with this. beam#1 has the following measurements:
depth=14.75, bflange=5.5, tflange=3/8". Beam #2 has the following depth:10", bflange=4", tflange=3/8". i need I and S values. Also what is their strength?
depth=14.75, bflange=5.5, tflange=3/8". Beam #2 has the following depth:10", bflange=4", tflange=3/8". i need I and S values. Also what is their strength?






RE: old beam sizes
RE: old beam sizes
For a pair of flanges, Page 6-19, Equal Rectangles, Axis of moments through center of gravity.
For the web, Page 6-17, Rectangle, Axis of moments through the center.
Since the axis for both the pair of flanges and the web is the same, add the results of the above equations. You now have a good approximation of "I" for the beam.
Divide "I" by "depth/2" (distance to the extreme fiber) and you have "S".
RE: old beam sizes
RE: old beam sizes
RE: old beam sizes
what is the tf for those two sizes? it maybe that the measurement is a little off. If the tf shown is 1/4" then it maybe right. For beam #2 i made a mistake the bf=4.5" and not 4". is there anything close in the reference book?
if the tf shown is a little smaller than the one measured then we will be on the safe side. What are the properties shown for those beams?
thanks a lot.
RE: old beam sizes
For a B24x35 #/ft-
tf = 0.490
bf = 5.5
d = 15
Ix = 367.9 Iy = 11.6
Sx = 49 Sy = 4.2
B35x36 #/ft-
tf = 0.588
bf = 5.5
d = 15
Ix = 405.1 Iy = 13.5
Sx = 54 Sy = 4.9
Similarly, for your second beam, there are many S shapes, from S10x30 down to S10x22 that fit your dimensions, but the tf's are larger (although not as much of a difference in thicknesses as in Beam #1). I'd check those sections in your steel manual for closest matching properties.
There is a beam designated CBL10 with d=10 and bf=4.02.
Also, a BJ10 with d=10 and bf=4 and tf=0.319.
Perhaps a B37x22 #/ft?
B37x22 #/ft-
d = 10
bf = 4.67
tf = 0.462
Ix = 113.9 Iy = 6.4
Sx = 22.8 Sy = 2.7
RE: old beam sizes
RE: old beam sizes
RE: old beam sizes
RE: old beam sizes
RE: old beam sizes
However, for the 10" beam I find that a wide flange section taken out of todays AISC manual most closely resembles the W10x15.
When I am working on a project that requires knowing the member designation for in-place steel I use a plastic dial caliper that I purchased from Lowes for a nominal amount. (Todays prices are approximately $30.) The caliper allows me to get dimensions in both 1/1000" and 1/64". It is designed so that I can take measurements in three different ways making it easy to measure from the outside, the inside and difficult to reach places via use of a long wire "probe".
If you would like additional details on the beams, their material/properties or the dial caliper I will fax the info to you. Contact me at pmkavsak@bellsouth.net.