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Seismic Design of Bridges Using Spring-Viscous Damper Isolation System
Author(s) and Affiliation(s):
Azadeh Parvin Department of Civil Engineering The University of Toledo, Toldeo, OH
Principal Investigator:
Azadeh Parvin
National Science Foundation
Research Start Date:
May 15, 1995
Expected Completion Date:
April 30, 1997
Research Objectives:
The objective of this research is to perform a feasibility study of novel bridge bearings subjected to lateral forces. It involves experimentation with steel spring bearing supporting highway overpasses that are susceptible to collapse resulting from horizontal and vertical movements caused by winds and earthquakes. The potential for using helical springs in combination with viscous damper systems will be studied. Most bridges in service today were not built strong enough to sustain earthquake loads, and consequently they may not be completely or partially functional after an earthquake. An isolation system will increase the fundamental period of vibration, and can reduce the earthquake forces on the bridge.
Expected Products or Deliverables:
The use of this type of bearing can help to reduce maintenance costs and to economically extend the service life of bridges. This will minimize post earthquake repair and could restore infrastructure to use very quickly. The conclusions drawn from data obtained during this research may eventually lead to modification of specifications, if necessary, and transfer of knowledge through scholarly media which are lacking for steel spring isolation systems in this country.

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