Partially bonded fiber reinforced elastomeric bearings: Feasibility, effectiveness, aging effects, and low temperature response

•Partially bonded (PB)-FREBs can retain the same advantages of unbonded-FREBs.•No relative slip occurs under low-rate lateral displacements in a PB-bearing.•The influence of static rotations on the hysteresis loops of PB-FREBs has been investigated.•A new copolymer employed in the bearings, and its...

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Bibliographic Details
Published in:Engineering structures 2019-01, Vol.179, p.120-128
Main Authors: Toopchi-Nezhad, H., Ghotb, M.R., Al-Anany, Y.M., Tait, M.J.
Format: Article
Language:English
Subjects:
Accelerated aging
Accelerated tests
Aging
Bearings
Bonding
Damping
Deformation
Elastomers
Feasibility studies
Fiber reinforced elastomeric bearing
Fiber reinforced materials
Low temperature
Rollover
Seismic isolation
Temperature effects
Unbonded and partially bonded application
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Summary:•Partially bonded (PB)-FREBs can retain the same advantages of unbonded-FREBs.•No relative slip occurs under low-rate lateral displacements in a PB-bearing.•The influence of static rotations on the hysteresis loops of PB-FREBs has been investigated.•A new copolymer employed in the bearings, and its response was examined experimentally.•The PB-application of FREBs as seismic isolators/bridge bearings is feasible. There are two classical types of application for fiber reinforced elastomeric bearings (FREB), namely, “bonded (B)” and “unbonded (UB)” applications. Although the UB-application results in improved seismic isolation efficiency due to rollover deformations, UB-FREB are not capable of transferring tensile forces, and may experience slip under certain loading conditions. As such, a new application type called Partially Bonded (PB) has been introduced to overcome these two limitations. A PB-FREB is achieved by partially bonding the top and bottom surfaces of the bearing to its contact supports. This paper presents the results of a comparative experimental study between UB-FREB and PB-FREB. Heat accelerated deterioration tests based on Arrhenius law was also conducted on the PB-FREB. Additionally, the low-temperature horizontal response of the PB-FREB was investigated. Results show that the displacement characteristics and damping values, long-term performance, and low-temperature response of the PB-FREB investigated in this study comply with current standard requirements.
ISSN:0141-0296
1873-7323
DOI:10.1016/j.engstruct.2018.10.043