Rubber based devices for seismic isolation have been adopted worldwide to protect buildings and bridges from seismic events. Very recently, a significant research effort has been dedicated to the study of Fiber Reinforced Bearings (FRBs): a low cost rubber base isolator for seismic hazard mitigation. In some applications, FRBs could be preferred over traditional steel reinforced isolators as: (i) they are lighter than conventional devices, (ii) FRBs can be produced by an easy manufacturing process where each bearing is cut to size and shape from a pad of big dimensions, and (iii) these bearings require materials with low mechanical properties and cost. This is because FRBs are generally adopted in unbounded configurations and they are free to roll off from the supports. While FRBs have proven to be an effective passive protection strategy in many applications, the effects of aging and other environmental conditions on the mechanical properties of these bearings are still to be addressed. With this consideration in mind, the aims of this work are those of: (i) studying the long-term performance and durability of FRBs through experimental tests, (ii) verifying the effects of aging on the response of FRBs both in compression and shear, (iii) determining the effects of aging of the bearings on the seismic response of a benchmark base-isolated building, while (iv) comparing the as new and aged response neoprene FRBs against that of conventional steel reinforced devices. This work contributes toward determining the viability of FRBs as base isolation devices and the effects of their aging on the seismic response of a typical residential building. Additional experimental studies are needed to fully characterize the differences in aging response of FRBs and conventional bearings and to understand the influence of manufacturing quality, procedures and materials on the long-term response of these low-cost devices.
|Commitee:||Rahmani, Mehran, Terzic, Vesna|
|School:||California State University, Long Beach|
|School Location:||United States -- California|
|Source:||MAI 81/4(E), Masters Abstracts International|
|Keywords:||Aging of bearings, base isolation system, Fiber Reinforced Bearings, FRBs, passive protection devices, Seismic response of a base-isolated building, Structural engineering|
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