Flat Sheet Metal Girders With Very Thin Metal Web. Part 2: Sheet Metal Girders With Spars Resistant to Bending - Oblique Uprights - Stiffness Page: 3 of 52
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.,A TIONAL ADVISORY CO"ITTE F7OR AFLOI1TAUTJTICS
TECHNITICAL 1 ,EMORANDUM NO. 605
FLAT SHEET IETAL CIRDERS WITH VERY T-I11, .LETAL WEB*
By Herbert Wagner
Sheet Metal Girders with Spars Resistant to Bend!ing -
Oblique Uprights - Stiffness
Noting that the stiffness of the girder increases very rap-
idly as $ increases, the result can be sulm ed up as follows:
When the cross stress preoonderates in one direction and when
the web plate is to be given the dimensions commensurate to its
stresses, it is advisable (regardless of any ensuing structural
difficulties) to set the uprights at about = 1200, thereby
lowering the weight of the plate wall 15 per cent (in contrast
to -- 900), and raisin; the stiffness 55 per cent. But,
when the cross stresses alternate and are approximately of the
same intensity in both directions, or, if the web plate thick-
ness is determined by other structural reasons, then S = 900
should be chosen.
,on-pt rallel Spars
In t iu case (Fig'. 14) part of the cross stress is carried
by the spa- re:'2rdless of ;hethcr the web plate is under ten-
*"Ebene Blcnawandtra er m it sethr aun2em Stcgblech.t" From Zeit-
schrift fur Flutechnik und Motorluftschiffahrt, Vol. 20, Nos. 9,
10 and 11, May 14 & 28, and June 14, 1929. For Part I, see
i.A.C.A. Technical Memoran'um No. 604. PRODCED B
4 NATIONAL TECHNICAL
U.S. DEPARTMENT Of COMMERCE
SPRINGflIELD, VA. 22161
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Wagner, Herbert. Flat Sheet Metal Girders With Very Thin Metal Web. Part 2: Sheet Metal Girders With Spars Resistant to Bending - Oblique Uprights - Stiffness, report, February 1931; (digital.library.unt.edu/ark:/67531/metadc63632/m1/3/: accessed November 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.