The Longitudinal Shear Strength Required in Double-Angle Columns of 24S-T Aluminum Alloy Page: 3 of 13
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TSSB O3BJOTS AND TR8O PRO01DURU
The cross sections of the columns tested are shown
in figure 1. Angles with unequal legs were chosen to
insure failure in the ~esitrd Adirection. The individual
angles were out from Pu-foot lengths of 848-!T aluminum-
alloy angles and were riveted together with A178- rivets.
Test coupons were out from both ends of four of the 80-
foot angles, and the stress-strain curves were determined,
the grand-total average value of Young's modulus was
10.6 x 103.kips per square inch. Tho variation of in-
dividual moduli from the grand-total average was nearly
0,.4 x 103 kips per square inch. Average moduli for the 80-
foot lengths obtained by averaging the individual moduli
for the two ends of each length, varied from the grand-
total average by only 0.1 x 10 kips per square inch. The
yield stress (0.2-percent offset) was I9.38 1.6 kips per
square inch. For the columns consisting of the smaller
angles (1 x 0/8 x 1/8), only short lengths of angle were
available; some of these angles were quite wavy, and no
stress-strain curves were obtained. for these small angles.
The ends of all column spcimens were carefully milled
flat and square. One series of columns was tested on knife-
"edge bearings; the majority of the columns, however, were
tested flat-ended. The cross-sectional areas were deter-
mined by weighing the specimens.
METHOD OF ANALYSIS
Two different methods are commonly used to compute the
necessary shear strenrh of built-up columns. One method
consists in assuming that the transverse shear ts 3 percent
of the column load. (See, for instance, refereonoo ,
p. ~53.) The other method consisted in assuming that the
column is used as a beam, subjected to transverse loads
with arbitrarily chosen distribution, and then using standard
methods.of beam design. Variations of this method take into
account the column stress. (See, for instance, reference 4,
p. sos.)
Tho origin of the -perooent value is not entirely olear;
it may be the tests of Talbot and Moore mentioned in refer-
ence 1. The longitudinal shear strength required by this
method isI
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Kuhn, Paul & Moggio, Edwin M. The Longitudinal Shear Strength Required in Double-Angle Columns of 24S-T Aluminum Alloy, report, May 1943; (https://digital.library.unt.edu/ark:/67531/metadc62242/m1/3/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.