Recorded and Numerical Strong Motion Response of a Base-Isolated Bridge
- 1 May 2004
- journal article
- Published by SAGE Publications in Earthquake Spectra
- Vol. 20 (2) , 309-332
- https://doi.org/10.1193/1.1705656
Abstract
Since 1983, 12 Icelandic bridges have been base isolated for seismic protection. Lead-rubber bearings have been used in all the cases. The Thjorsa River Bridge, built in 1950 and retrofitted with base isolation in 1991, is instrumented by strong-motion accelerometers. The bridge has one 83-m-long main span and two 12-m-long approach spans. Only the main span, a steel arch truss with concrete deck, is base isolated. In June 2000, two major earthquakes of magnitude 6.6 and 6.5 occurred in South Iceland; the epicenter was close to the Thjorsa River Bridge. In the first earthquake, a peak ground acceleration of 0.53 g was recorded at the bridge site, and in the second earthquake, a peak ground acceleration of 0.84 g was recorded. The Thjorsa River Bridge survived the earthquakes without any serious damage and was open for traffic immediately after the earthquakes.Keywords
This publication has 7 references indexed in Scilit:
- Site amplification in lava rock on soft sedimentsSoil Dynamics and Earthquake Engineering, 2002
- Design of Seismic Isolated StructuresPublished by Wiley ,1999
- Earthquakes and present-day tectonism in IcelandTectonophysics, 1991
- Seismic Isolation: History, Application, and Performance—A World ViewEarthquake Spectra, 1990
- Aseismic base isolation: review and bibliographySoil Dynamics and Earthquake Engineering, 1986
- Stochastic Variation of Earthquake Ground Motion in Space and TimeJournal of Engineering Mechanics, 1986
- Equivalent Linearization for Hysteretic Systems Under Random ExcitationJournal of Applied Mechanics, 1980