618 CHAPTER 22 Wings
Ans. P 1 =−P 6 =1200N P 2 =−P 5 =2424N P 3 =−P 4 =2462N
q 12 =q 56 =3.74N/mm q 23 =q 45 =3.11N/mm q 34 o=0.06N/mm
q 43 i=12.16N/mm q 52 =14.58N/mm q 61 =11.22N/mm.P.22.9 Aportionofawingboxisbuilt-inatoneendandcarriesashearloadof2000Nthroughitsshearcenter
andatorqueof1000NmasshowninFig.22.9.Iftheskinpanelintheuppersurfaceoftheinboardbayisremoved,
calculatetheshearflowsinthesparwebsandremainingskinpanels,thedistributionofloadinthesparflanges,
andtheloadingonthecentralrib.Assumethatthesparwebsandskinpanelsareeffectiveinresistingshearstresses
only.
Ans. Bay①:qinsparwebs=7.5N/mm
Bay②:qinsparwebs=1.9N/mm,inskinpanels=9.4N/mm
Flangeloads(2):atbuilt-inend=1875N(compression)
atcentralrib=5625N(compression)
Ribloads:q(horizontaledges)=9.4N/mm
q(verticaledges)=9.4N/mm.Fig. 22.9