620 CHAPTER 23 Fuselage Frames and Wing Ribs
Fig.23.1
Cantilever beam of Example 23.1.
Fig.23.2
Free body diagrams of stiffeners JK and HKD in the beam of Example 23.1.
thehorizontalcomponentoftheloadatKisequilibratedlocallybytheaxialloadinthestiffenerJK
andnotbythebendingofstiffenerHKD.Bythesameargument,theverticalcomponentoftheloadat
KisresistedbytheaxialloadinthestiffenerHKD.Theseaxialstiffenerloadsareequilibratedinturn
bytheresultantsoftheshearflowsq 1 andq 2 inthewebpanelsCDKJandJKHG.Thus,weseethat
thewebpanelsresisttheshearcomponentoftheexternallyappliedloadandatthesametimetransmit
thebendingandaxialloadoftheexternallyappliedloadtothebeamflanges;subsequently,theflange
loadsarereactedatthesupportpointsAandE.
ConsiderthefreebodydiagramsofthestiffenersJKandHKDshowninFig.23.2(a)and(b).