Ruzek, J. M.

Topractsoglou, A. A.

English

Lehigh University: Lehigh Preserve

Lehigh University
Lehigh Preserve
Fritz Laboratory Reports Civil and Environmental Engineering
1949
Test of a rigid frame knee, Lehigh University,
(1949)
J. M. Ruzek
A. A. Topractsoglou
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Recommended Citation
Ruzek, J. M. and Topractsoglou, A. A., "Test of a rigid frame knee, Lehigh University, (1949)" (1949). Fritz Laboratory Reports. Paper
1316.
http://preserve.lehigh.edu/engr-civil-environmental-fritz-lab-reports/1316
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LEHIGH UNIVERSITY
DEPARTMENT OF CIVIL ENGINEERING
. .
FRITZ ENGINEERING LABORATORY
BETHLEHEM. PA.
September 9, 1949
File No. 205C
To: Members, Lehigh Project Subcommittee
Struc tura 1 Steel Commi t.tee
Welding Research Cnuncil
REVISED PROPOSAL FOR CONNECTION[ rrESTS
Gentlemen: .
PHONE
BETHLEHEM 7·507'
FRITZ E. i... OFFICE EXT. 256
HYDRAULICS LAB. EXT. 279
Themlnutes of ,the June second, 1949, meeting of
the Lehigh Subcommitte~ call for a proposal cn connection
tests. It is the purpose 6f this letter to forward to you
our recommendations. This. revision is intended to supple-
ment tb6)previous proposals and discussions that have been
issued(l _
PUHPOSE
As a part of the study to determine the besic be-
havior of welded joints in the elastic and plastic range,
it is the primary purpose of these IImodel B tests to study
the influence of certain variables yvj. tlJin several connection
types. An example is the influence of radius of curvature
and thickness of'curved flanges •
. -PROGRAM OF TESTS
A total of 14 tests are proposed as shown in Table 10
The sketch of connection types originally included in Progress
Report IlA lf is presented in modified form as Fig. 1 for 1n-
formation. Figs. 3-9, containing detail drawings of the
various connection types, are referred to in Table I.
"
Although not strictly in accordance with
stated above, tests, I C" and ilN il are suggested. for
son with the other tests of ilbracketed li corners.
taken from actual construction examples.
SELECTION OF SECTION
the purpose
compari-
Both are
Use of a 6 11 section is recorm~1ended. 1"106els usj.ng
this section can be handled without a cran6, which will
-" - . ~ - - - - - - - - ;. - - - - - - - - - - - - - -
( l) Progress Report A, Nov. 26:, 1948, Appendix B.
~ - " Progress Report E JUn. 1, 1949. .., .
,- 'Proposal to Office of Naval Research, May 7 1948,p.l of By;,..',',
~t." Progress Roport P July 19, 1949, 9., p.
2050 Revised Proposal
- 2 - September 9, 1949
facilitate the experimental program.
The various 6 11 secti.ons available are shown in
Fig. 2, the 6~F15.5 having been selected. The flanges
will be flame cut by machinE; to 2 .. 9 11 , thus simulating the
14WF30 section used in test of connE;ction 7, as shown by
the following comDariosn:
r.-------r-----,.----·.. ------·----·-="~=·-·--·· ..... -.-----'
ISection Depth Flange Web
t-----l---........---l.....,Vn:'ri\V."..i":'rd-r"t..-:h=,...b-t~r'*'h-l~·~ c"""l:--{n e s s=t V'f" nib tlw
2.055 1.2
0.250
14VvF30
---.---.---t--,..--.----f--------.- .-'-- -_....._-..
13.875 6.750 0.375 0.3125
f------l-----'----1f----,...--:----l---------t---'
6.0 c~~9~o 0.250
• __ ._. ~._. . __..... _.__...... ,_.~._- __---........... ._.._._, . __ ',.__._.__• .• "'•.•..•. _. __ ..... _.t.
The 14~F30 section, tE;sted as typE; 7, gave results
that are typical for average rolled members of similar bid
ratio. A calculation has been made which shows that in
most cas6s, type 7 knees fabricated of these sections would
fail by shear in the knee web 'before reaching the yield
point in bending.
TEST ARRANGEMENTS
Instead of using a dynamometer and jack as on con-
nection 7, these models can be testee in our 300,000 lb.
testing machine, the 16 ngth of each leg being 4 '_0". Both
legs will bE; of the same section, and all tests will be made
in "compression" as was the type 7 test.
On some tests it mav be desirable to use a maximum
of 4 SR-4gag8s to determine
U M-0 characteristics at a particular
section. Otherwise level bars, dial gages and whitewash will
be depended upon to give information on moment-rotatj.on, defor-
mation, yielding, and load-carrying capacity.
GENERAL
A further discussion of each test is contained in
Appendix 1.
ArrangemE;nts will procede in two weoks to order ad-
ditional material and commence tests. Your opinion on the
attached postcard will be most welcome. This Droposal is

TABLE I
Proposed Corner Connection Tests
I Test ! Type of' NU.m.ber of
1--li9de1 : Conn. Specimens Sketch
---, I
f I r- ::1I ,A ! ~ 1 .~I JI See Pig. 3.
I II ---------I ! ~! Ii I! I r]J / 2B 1I See Fig. 4.I I ,i~I Il_ I 1II !
-J \I \III C 15 1 ~....i II I See Fig. 7.I I c--lI
t--
I ~ II;J=:I [DC M ~I (I n tiI·I D I 4 3 ';r //~ yI E -'~'lr C"" r.. :'~I.::- rI F II Jl (D). I (E) I (F)II I '--- I---I c:.P.A Ti'i C1' R
f ~
I ~ f ~:JU)iI G 5A 4
H r"~'~8 I ~~ = 10i'"
I '= 'I (G)R~18" t-~" Kr t ~. t( .)
J
I
--- 01) R=12 ", t::3;8"' G
( I )R~.O~,t=!" LJ . ..
,.
-----
See F:i,g. 9 .
I
,
r~.... ifFJ~ \I l~ )I: ~nK 8B 3 \ Ii IL I UiIv! ,.I (K) I I (L) ( M)
'---
'-See' Fig.r'> 6
I - + 11 =& ,I II Ii 0:N 16 1 O' ---.t: INI ~II /;/ I
.L -;;;.--- I See Fig. 8,.. 'Z.D .1
i
----
205C Proposal Septembe~ 9, 1949
APPENDIX I
DISCUSSION OF TESTS
Test A, Type 2
This model was previously approved on the basis of
tests by Dr. Grinter. It seems de~irable to include it in
the program and compare it with Test B, even though the
.haunches in the la tter oase prevent an exact conr9arison,
Tes t B, r:I'ype 2B
See comments above. This detail has .been taken from
r1r. Amirikian'srecent article in the v\elding Journal, JUly,
1949. Such a corner conne,ction is possibly of more practical
application than type 2.
r.l'es t C, Type 15
This is also taken from Mr. Amirikian's article and
might be considered a modifica tion of type 7, permi tting
greater loading. The haunch extending to the butt plate
in the upper'member is built up of plate material, the rest
of the model being a rolled section.
Tests D-E-r, Type 4
Proposed initially by the Navy at the beginning of
the program, examples of the use of this detail may be seen
in the above-mentioned article. Tests D and E study the
effect of depth of the outermost stiffener. Test F will
emWloy the sniped stiffener detail over the inner flange of
the column, the outer stiffeners being selected after the
first two tests.
Tests G-H-I-J, Type 5A
These have been reduced in scale from those shown
ill Progress Report E and are des cribed there. Tea ts G, IT,
aDd I are designed to study influence of radius of curvature
and thickness of inner flange according to the recommendations
9f the AISC in j, ts recent paper by Mr. Griffi ths, "s ingle
Span Rigid Frames in Stee 1 II • In Ires t "3", a sma +1 radius
is used without increasing the flange thickness, substitriting
addi t ion a 1 ti 1 t ing bra eke ts in the curved par t ion.
rI'es ts Y -L-M, Type 8B
. The influence of the stiffener at the juncture of
inner flanges of the two members is being studied here.
Only unanticipated difficulties would require another test
of thi s series usi ng a full re c tangula r stiffener to repla ce
the sniped one. If tes ts "K II and il~.1ir give similar re suI ts,
test "L" may not be needed.
205C Proposal Appendix 1-2 September 9, 1949
Where bulkheads and decks of ship-like structures
are both stiffened, the detail shown is one that is often
employed. It is usual to assume that 30 tim.es the thickness
of the plating acts as a flenge. On the basis of a 6WF15.5
section with a flange tb.iclmess of 1/4 11 , thj,s provides an·
upper flange of 7i ll , the depth being 6.0 il ancl. the lO'i,Jer
flange width being 2.9 11 •
This exploratory test seems desirable on this smaller
scale where simplicity and oconomy of experiment is being
sought.
Com.parison of Test Results
Tl1.e results of each test may be compared with theoretic,?='.
8n8 lys is of' behavior a t the sec tion '!ivhere the leg joins 'thE.
knee proper. This is the sec~ion at which there is the first
departure from a simple rolJ.ed section.
The experimental comparisons within each group are
obvious. Comparj.son in behavior is also possible betl"Jeen
types 4, and 15 since in each case th8 length of knee along
one leg equals twice the depth of the section.
,
Another comparison might be based on depth of knee
at the iltbroat l1 ••• the minimum distance from tho outside
corner to the inner flenge.
/lifTid frame Corner Con-
nections. fl20§['-3/
J-M-R










Test of a rigid frame knee, Lehigh University, (1949)

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Test of a rigid frame knee, Lehigh University, (1949)

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