Abstract
Granular media can be used inside structural elements to make their vibration damped. As an example, using granular dampers at the foundation and between the stores reduces the vibration of upper stores when earthquake waves are transferred to the building foundation. In this paper, effects of sand particles size and volume fraction are studied on the attenuation of free vibration of an aluminum elastic beam of box section encompassing sand particles. A high-speed camera was used to measure damping ratio of the beam vibration. It was observed that damping ratio of the beam filled partially with different sand samples was larger than those of the completely filled, mostly filled and empty beams. It was found that two parameters were responsible for larger damping ratios of partially filled beams: 1-frictional energy loss between sand particles themselves and the beam walls; 2-degree of particles possible movements leading to their slippage and collisions.
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