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Field and Laboratory Studies on the Seismic Performance of Bridge Systems
Author(s) and Affiliation(s):
John B. Mander, Stuart S. Chen, Dae-Kon Kim and Daniel A. Wendichansky Department of Civil Engineering State University of New York at Buffalo, Buffalo NY
Principal Investigator:
John B. Mander and Stuart S. Chen
Federal Highway Administration and the National Center for Earthquake Engineering Research
Research Start Date:
July 1993
Expected Completion Date:
December 1996
Research Objectives:
The objective of this research is to investigate, both experimentally and analytically, the seismic performance of slab-on-steel girder bridges before and after rehabilitation of an in-service bridge with elastomeric bearings. The original bearings used in this bridge consist of a variety of low (sliding) and high (rocker) bearings. According to the recently published FHWA Seismic Retrofitting Manual such bearings are prime candidates for replacement due to their historically poor performance in earthquakes. The objectives of this research are to investigate at what level of seismic excitation steel bearings perform satisfactorily, whether simple retrofits to the steel bearings themselves markedly improve overall seismic resistance, and to assess the performance of different types of elastomeric bearings with and without supplemental energy dissipation capabilities.
Expected Products or Deliverables:
Recommendations regarding experimental investigation of the seismic performance of bridges of moderate size using tension-based snap back testing; development of a hybrid time domain-frequency domain system identification procedure for analyzing highly damped non-linear systems with closely spaced frequencies; experimental data for bridges seated on different bearing types possessing different degrees of nonlinearity; and mathematical modeling techniques for steel bearings as well as elastomeric bearings including temperature and strain rate effects.

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