Determine the force in member BE of the loaded truss The for

Determine the force in member BE of the loaded truss. The force is positive if in tension, negative if in compression.

Solution

BE=2d/6sin 21+(3d/6)(d/12)-Ay(3d/6)

to find Ay

9d^2/(36)+(10Ld/6)-(d/2)Ay=0

Ay=(1/2)d+(10L/3)

BE=2d/6sin 21+(3d/6)(d/12)-((1/2)d+(10L/3))(3d/6)