old roof framing member designations
old roof framing member designations
(OP)
I am looking at a building that has drawings dated in 1960. Some of the framing has designations for "L" joists from the 50's. There are some joist framing members that span about 16'-0" that appear to be designated "12-1056" and "8-1256" spaced at 4'-0". Does anyone know what this framing designation is or if it is referring to something else?
Thanks for the help
Thanks for the help






RE: old roof framing member designations
RE: old roof framing member designations
RE: old roof framing member designations
They have them listed as both "12BL" "B12L" - for 12" Bethlehem shapes of different weights.
Also listed were "10BL" or "B10L" and "8BL" or "B8L" - the BL designation was evidently stopped from production in 1948. (A little before the year of your building, so that is consistent with somebody using an old Shapes book for the drawing.)
Didn't see any sub-designations comparable to 1056 or 1256 though.
An "L" shape is (usually) an alternate designation for an AN or angle shape in modern terms.
RE: old roof framing member designations
Library: HISTORIC
Type: ALL (Weight)
ID = 367
Designation = 8BJ,BJ8
W = 10
A = 2.95
D = 7.9
TW = 0.17
BF = 3.94
TF = 0.204
T = 6.865
K = 0.517
BF_2TF = 9.66
H_TW = 40.4
FY3P = 39
X1 = 1860
X2 = 14532
IX = 30.8
ZX = 8.6
SX = 7.8
RX = 3.23
IY = 2
ZY = 1.6
SY = 1
RY = 0.82
J = 0.04
CW = 30
a = 41.5
WNO = 7.58
SW = 2
QF = 1.48
QW = 4
FSTR =
BJ12-10-8-X4,S43 1933,
S47 1934,
12BL-10BL-8BL-X4,S51 1938,
S53 1943,
S54 1946,
S56 1948,
RE: old roof framing member designations
RE: old roof framing member designations
For a designer looking at steel under a roof that will be worked on in the early 2010's.
RE: old roof framing member designations
Library: HISTORIC
Type: ALL (Weight)
ID = 366
Designation = 10BJ,BJ10
W = 12
A = 3.39
D = 9.87
TW = 0.18
BF = 3.95
TF = 0.204
T = 8.835
K = 0.517
BF_2TF = 9.68
H_TW = 49.1
FY3P = 27
X1 = 1585
X2 = 31596
IX = 51.9
ZX = 11.8
SX = 10.5
RX = 3.92
IY = 2
ZY = 1.7
SY = 1
RY = 0.77
J = 0.05
CW = 47
a = 48.8
WNO = 9.55
SW = 2
QF = 1.86
QW = 6
FSTR =
BJ12-10-8-X4,
S43 1933,
S47 1934, 12BL-10BL-8BL-X4,S51 1938,
S53 1943,
S54 1946,
S56 1948,