Introduction to Aircraft Structural Analysis (Elsevier Aerospace Engineering)

108 CHAPTER 4 Virtual Work and Energy Methods

Fig. P.4.2

P.4.3 Determine the reactions at the built-in end of the cantilever beam ABC shown in Fig. P.4.3 using the
principleofvirtualwork.

Ans. RA= 3 WMA=2.5WL.

Fig. P.4.3

P.4.4 Findthebendingmomentatthethree-quarter-spanpointinthebeamshowninFig.P.4.4.Usetheprinciple
ofvirtualwork.

Ans. 3 wL^2 /32.

Fig. P.4.4

P.4.5 CalculatetheforcesinthemembersFG,GD,andCDofthetrussshowninFig.P.4.5usingtheprinciple
ofvirtualwork.Allhorizontalandverticalmembersare1mlong.

Ans. FG=+20kN GD=+28.3kN CD=−20kN.