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Numerical parametric investigation of hysteretic behavior of steel-reinforced elastomeric bearings under large shear deformation

Khaloo, A ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1016/j.istruc.2020.04.029
  3. Publisher: Elsevier Ltd , 2020
  4. Abstract:
  5. Steel Reinforced Elastomeric Bearings (SREB) are mostly designed and used for providing different supporting conditions under service loads; while recent studies have shown remarkable characteristics which help them as a cost-effective isolation system. However, little investigation has been carried out to indicate the influence of parameters affecting the mechanical properties of the bearings under large shear deformations (i.e., the seismic performance as an isolation system). A comparative parametric study was conducted herein through finite element modeling of SREBs. The implemented model was also verified by experimental test results. The hysteretic behavior was studied in both cases of bounded and unbounded, and under shear strains up to 125% of the bearing's total rubber height, which is far beyond that of service-load induced strains. Effects of critical parameters like shape factor, Shim thickness and vertical loading level were investigated. Meanwhile, the horizontal stiffness was kept constant to allow a rational comparative study. It was shown that shape factor and vertical load level have notable influence on the effective stiffness and equivalent viscous damping of the bearings. Ruptures were also seen in steel shims of both bounded and unbounded SREBs, which were categorized in flexural and slicing ruptures. Eventually, a bilinear model was derived from the finite element analyses results to predict the hysteretic behavior of SREBs, while considering the interactive effect of both shape factor and compressive stress. The proposed model can simply be implemented in macro modeling. © 2020 Institution of Structural Engineers
  6. Keywords:
  7. Base isolation ; Bilinear model ; Bounded ; Bridge ; Elastomeric bearing ; Finite element modelling ; Hysteretic behavior ; Unbounded
  8. Source: Structures ; Volume 26 , August , 2020 , Pages 456-470
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S2352012420301831