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Experimental investigation of life-time performance of unbounded natural rubber bearings as an isolation system in bridges

Maghsoudi Barmi, A ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1080/15732479.2020.1793208
  3. Publisher: Taylor and Francis Ltd , 2020
  4. Abstract:
  5. An experimental research study was carried out to investigate the life-time performance of unbounded Steel Reinforced Elastomeric Bearings (SREB), which are designed and used for service limit state in bridges, subjected to seismic demands. Such behaviour was investigated using 13 full-scale specimens in three phases; (1) effects of long-term service, namely the long term presence of vertical loading at service limit state, on the mechanical properties of the bearings, (2) effects of consecutive shear loading at different amplitude in presence of permanent loading, and (3) post-earthquake behaviour of the bearing against service load conditions. An innovative test setup was utilized in which the initial situation of the bearings remains unchanged, i.e. bearings do not experience unloading. Using this setup, a realistic loading condition is provided and the contact surface conditions also remain unchanged. It was shown that vertical stiffness, shear stiffness, and damping coefficient of the bearing which are the main parameters of an isolation system, might experience some changes during the life-time of the bearing. However, based on the results obtained, the life-time performance of the SREBs as an isolation system in bridges was evaluated as satisfactory and a durable performance was observed for this type of bearings. © 2020, © 2020 Informa UK Limited, trading as Taylor & Francis Group
  6. Keywords:
  7. Bridges ; Life-time performance ; Post-earthquake behaviour ; Seismic isolation ; Shear loading test ; Unbounded elastomeric bearings ; Nonmetallic bearings ; Shear flow ; Stiffness ; Unloading ; User experience ; Damping coefficients ; Earthquake behaviours ; Elastomeric bearing ; Experimental investigations ; Experimental research ; Loading condition ; Service load condition ; Vertical stiffness ; Steel research
  8. Source: Structure and Infrastructure Engineering ; July , 2020 , Pages 1-14
  9. URL: https://www.tandfonline.com/doi/abs/10.1080/15732479.2020.1793208?journalCode=nsie20