Abstract
In the present paper, the vibration of the web plate under sinusoidally time-varying inplane moment is examined from the point of view of dynamic instability. The web plate is idealized by one rectangular plate surrounded by the upper and lower flange plates and vertical stiffeners. Inplane static and sinusoidally time-varying moments act on the edges of the plate. The dynamic instability regions are analyzed by the small deflection theory of thin plate. The amplitudes of unstable motions are determined by large deflection theory considering geometric nonlinearity.
Numerical results are presented for various boundary conditions, loading conditions and dampings of the plate.
