A beam vibration originating in the beam porous structure or on a non-smooth
boundary might make its vibrating energy concentrated on a single wave,
leading to a solitary wave. This paper applies the variational approach to
analysis of the soliton basic property, and the effect of the fractal
dimensions on the solitary wave is elucidated. This paper is to draw
attention the beam soliton property be-yond its widely known resonance and
periodic and chaotic properties.