Wave Propagation and Mode Localization in Simply Supported Multispan Beams with Couplers on Supports
Publication: Journal of Engineering Mechanics
Volume 130, Issue 7
Abstract
The influences of couplers on wave propagation and mode localization in simply supported multispan beams with couplers consisting of lumped rotational stiffness and mass on supports are studied. A transfer matrix equation governing the vibrational wave propagation in the simply supported multispan beams with couplers is newly derived and simplified. The eigenvalue of the simplified transfer matrix shows that the larger stiffness or the larger mass of the coupler makes the internal coupling between spans weaker and so it makes the system more sensitive to mode localization. As the wave frequency or the eigenvalues of the system increases, the mass effect is increased while the stiffness effect is decreased. In a case considering the large stiffness and mass at the same time, there is a region with relatively wider passbands and narrower stop bands having small attenuation rates and the normal modes in it become delocalized ones. As an example structure, a simply supported two span beam with a coupler at the midspan is considered.
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Published In
Journal of Engineering Mechanics
Volume 130 • Issue 7 • July 2004
Pages: 747 - 752
Copyright
Copyright © 2004 American Society of Civil Engineers.
History
Received: Nov 8, 2001
Accepted: May 20, 2003
Published online: Jun 15, 2004
Published in print: Jul 2004
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