Introduction to Aircraft Structural Analysis (Elsevier Aerospace Engineering)

Problems 213

Fig. P.6.4

Explainhowthememberforcescanbeobtained.

P.6.5 TheframeshowninFig.P.6.5hastheplanesxzandyzasplanesofsymmetry.Thenodalcoordinatesof
one-quarteroftheframearegiveninTableP.6.5(i).
Inthisstructure,thedeformationofeachmemberisduetoasingleeffect,thisbeingaxial,bending,ortorsional.
ThemodeofdeformationofeachmemberisgiveninTableP.6.5(ii),togetherwiththerelevantrigidity.

Fig. P.6.5

Table P.6.5(i)

Node x y z

2000

3 L 00

7 L 0.8L 0

9 L 0 L

Table P.6.5(ii)

Effect

Member Axial Bending Torsional

23 – EI –

37 – – GJ=0.8EI

29 EA= 6

√

2 EIL 2 ––