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Investigating the effect of span-length and earthquake directivity on the response of multi-span continuous girder bridges isolated by friction bearings

Investigating the effect of span-length and earthquake directivity on the response of multi-span...  Bridges are of particular importance among the structures built by human beings. Therefore, the desired seismic behaviour of this type of structures during the earthquake is of utmost importance. The friction pendulum system is considered as a type of sliding isolator in which sliding motion and recursive force are combined by isolator’s geometry. The effects of the earthquake directivity and the span-length of two multi-span continuous steel girder bridges were investigated in this study. The base shear created in the bridges depends on the bridge span, so that more base shear is applied on the bridge with longer spans. In both bridges, the base shear under records of a side with directivity feature was more than the other side. Deck displacement in the bridges in the side with directivity feature was significantly larger than the other side. This increase in structural displacement can lead to the pounding of the bridge deck on abutments. For this reason, it seems necessary to embed the appropriate expansion joints considering the effect of directivity of the earthquakes. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Bridge Structures IOS Press

Investigating the effect of span-length and earthquake directivity on the response of multi-span continuous girder bridges isolated by friction bearings

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Publisher
IOS Press
Copyright
Copyright © 2020 © 2020 – IOS Press and the authors. All rights reserved
ISSN
1573-2487
eISSN
1744-8999
DOI
10.3233/BRS-200169
Publisher site
See Article on Publisher Site

Abstract

 Bridges are of particular importance among the structures built by human beings. Therefore, the desired seismic behaviour of this type of structures during the earthquake is of utmost importance. The friction pendulum system is considered as a type of sliding isolator in which sliding motion and recursive force are combined by isolator’s geometry. The effects of the earthquake directivity and the span-length of two multi-span continuous steel girder bridges were investigated in this study. The base shear created in the bridges depends on the bridge span, so that more base shear is applied on the bridge with longer spans. In both bridges, the base shear under records of a side with directivity feature was more than the other side. Deck displacement in the bridges in the side with directivity feature was significantly larger than the other side. This increase in structural displacement can lead to the pounding of the bridge deck on abutments. For this reason, it seems necessary to embed the appropriate expansion joints considering the effect of directivity of the earthquakes.

Journal

Bridge Structures – IOS Press

Published: Jul 9, 2020

References

  • Seismic fragility of typical bridges in moderate seismic zones
    Choi
  • Recorded and numerical strong motion response of a base-isolated bridge
    Bessason
  • A complex earthquake sequence captured by the continuous GPS network in SW Iceland
    Hreinsdóttir
  • Performance of a seismically isolated bridge under bear-fault earthquake ground motions
    Shen
  • Comparison of dynamic response of isolated and non-isolated continuous girder bridges subjected to near-fault ground motions
    Liao
  • Bridge seismic response as a function of the Friction Pendulum System (FPS) modeling assumptions
    Eröz