Are the stiffness terms in "Exact stiffness matrix for beams on elastic foundation" by Moshe Eisenberger, David Z. Yankelevsky (1985) correct?

The stiffness term S11 in equation (6a) goes negative for lambda*L > pi/2. As this term links the displacement at x=0 to the load at x=0, it should always be positive, regardless on the length...

09 December 2024 2,507 0 View