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Proceedings Paper

Design and application of energy-dissipating dampers on a new concrete bridge in California
Author(s): Hans Strandgaard
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Paper Abstract

Passive energy dissipation systems have long been used in industrial, military and aerospace applications but only more recently in bridges. This paper will review the first use of dampers on a new concrete bridge in the United States. Dampers were incorporated into the design of a pair of 1270-foot long bridges to absorb energy induced by earthquakes and reduce seismic movements. The bridges are located on the Eastern Transportation Corridor, a 27-mile long design/build toll road in Orange County, California. The two-level seismic design criteria required consideration of seismic movements in sizing the joints and backwall gaps. The intent of the criteria is to maintain toll road traffic following the lower level earthquake by preventing damage to the abutments and joint seal assemblies. Each bridge was fitted with three 160-kip, 0.4 exponent, nonlinear fluid viscous dampers. The units reduce the lower level longitudinal seismic movement by approximately forty-five percent allowing the use of smaller joint seals. Because nonlinear devices were used, the structures will also see significant reductions in upper level forces and displacements as well. The design principles, applicable design codes, analysis requirements, detailing and design specifications will be discussed. The benefits and potential cost savings of dampers will also be reviewed.

Paper Details

Date Published: 27 April 2000
PDF: 12 pages
Proc. SPIE 3989, Smart Structures and Materials 2000: Damping and Isolation, (27 April 2000); doi: 10.1117/12.384581
Show Author Affiliations
Hans Strandgaard, CH2M HILL (United States)

Published in SPIE Proceedings Vol. 3989:
Smart Structures and Materials 2000: Damping and Isolation
T. Tupper Hyde, Editor(s)

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