Performance of different seismic isolation systems in highway bridges subjected to near-fault earthquakes

Document Type : Research Article

Authors

1 MSc. Students, Kharazmi University

2 kharazmi university, Tehran, Iran

Abstract

Implementation of base isolation bearings is one of the effective methods to retrofit of bridges. In this study, performance of different seismic isolation systems under near-fault earthquakes is compared by applying nonlinear time history analysis of seismically isolated bridge by five different methods including Lead-Rubber (LRB), High Damping Rubber Bearing (HDRB), Single Friction Pendulum (SFP), Triple Friction Pendulum (TFP) and a typical bridge model by assuming a rigid connection between the deck and bridge piers is evaluated. Responses were estimated by performing nonlinear time history analyses by considering the main aspects of the simulation and by taking into account the nonlinear behavioral complexity of the base isolation bearing in OpenSees software. Results indicated that the frictional base isolations significantly reduce the stresses induced in the piers of bridge in comparison with the typical bridge model, and improve the seismic performance of the bridge substantially. The percentage of reduction for triple frictional pendulum and single frictional pendulum bearings reached 91% and 85%, respectively

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References

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Amirkabir Journal of Civil Engineering
Volume 51, Issue 3
September and October 2019
Pages 437-451

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