Evaluating the Effect LRB Isolators in Retrofitting a Truss Bridge
محورهای موضوعی : structural mechanics
majid moradi
1
,
sepide rahimi
2
,
Sadegh Rezaei
3
,
nima ranjbar
4
1 - Assistant Professor, University of Science and Technology of Mazandaran
2 - Department of Civil Engineering, No.C., Azad University, Noor, Iran
3 - Assistant Professor, University of Science and Technology of Mazandaran
4 - Department of Civil Engineering, No.C., Azad University, Noor, Iran
کلید واژه: Truss bridge, seismic isolator, seismic performance, fragility curve, retrofitting,
چکیده مقاله :
One of the things used to equip and strengthen bridges is the addition of a seismic isolator. In this study, the seismic performance of a truss bridge equipped with a seismic isolator has been evaluated. Thus, two structural models of a truss bridge have been modeled nonlinearly in the Perform software. One is the initial and main model and the other has a seismic isolator. Initially, using incremental dynamic analysis, seismic parameters such as the horizontal displacement of the superstructure, the hysteresis curve and the time history of the moment applied to the column, the horizontal displacement of the column head and the hysteresis curve of the models have been investigated. Finally, the incremental dynamic curves and the fragility of the structures have been investigated and compared using twenty earthquake records. The results show that the use of an isolator reduces the horizontal displacement of the bridge column and reduces the probability of its collapse at different accelerations and different performance levels.
One of the things used to equip and strengthen bridges is the addition of a seismic isolator. In this study, the seismic performance of a truss bridge equipped with a seismic isolator has been evaluated. Thus, two structural models of a truss bridge have been modeled nonlinearly in the Perform software. One is the initial and main model and the other has a seismic isolator. Initially, using incremental dynamic analysis, seismic parameters such as the horizontal displacement of the superstructure, the hysteresis curve and the time history of the moment applied to the column, the horizontal displacement of the column head and the hysteresis curve of the models have been investigated. Finally, the incremental dynamic curves and the fragility of the structures have been investigated and compared using twenty earthquake records. The results show that the use of an isolator reduces the horizontal displacement of the bridge column and reduces the probability of its collapse at different accelerations and different performance levels.
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