Dynamic Characteristics of Chilean Bridges with Seismic Protection
Publication: Journal of Bridge Engineering
Volume 10, Issue 2
Abstract
A new highway system is being constructed in Chile including many bridges. Due to the high seismic risk in the country, high damping rubber bearings, friction bearings, and passive energy dissipation devices have been considered in the design of the majority of the new moderate and large span bridges. Their design follows American Association of State Highway guidelines and technical specifications from the Chilean Ministry of Public Works. Experimental and analytical studies have been performed in three of these structures: (1) a 383 m long continuous beam bridge supported on high damping rubber bearings; (2) a 268 m long continuous beam bridge supported on friction bearing with additional viscous dampers; and (3) a five-span simply supported beam bridge resting on neoprene bearings. Predominant periods and damping characteristics for small amplitude vibrations have been determined from output-only nonparametric analyses. Comparison with standard analytical structural models indicates that the models normally used for analysis yield comparable predominant periods and mode shapes but the damping values typically recommended are larger than the ones observed from ambient vibrations, even when additional energy dissipation elements are present.
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Acknowledgment
The support of University of Chile, Fondecyt No. 1940466 and No. 1011025, MOP Proyecto Innovaciones Tecnológicas, SACYR and ALCHISA, is greatly acknowledged. We also thank the collaboration of Pedro Soto for his work during the development of this research.
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 10 • Issue 2 • March 2005
Pages: 124 - 132
Copyright
© 2005 ASCE.
History
Received: Jan 27, 2003
Accepted: Apr 7, 2004
Published online: Mar 1, 2005
Published in print: Mar 2005
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