Structural Engineering and Mechanics

  • 제61권1호
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  • Pages.31-47
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  • 2017
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  • 1225-4568(pISSN)
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  • 1598-6217(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Analysis of fiber-reinforced elastomeric isolators under pure "warping"

  • Pinarbasi, Seval (Department of Civil Engineering, Kocaeli University) ;
  • Mengi, Yalcin (Department of Engineering Sciences, Middle East Technical University)
  • 투고 : 2016.03.12
  • 심사 : 2016.08.23
  • 발행 : 2017.01.10
⟨ 이전 논문 다음 논문 ⟩

초록

As a relatively new type of multi-layered rubber-based seismic isolators, fiber-reinforced elastomeric isolators (FREIs) are composed of several thin rubber layers reinforced with flexible fiber sheets. Limited analytical studies in literature have pointed out that "warping" (distortion) of reinforcing sheets has significant influence on buckling behavior of FREIs. However, none of these studies, to the best knowledge of authors, has investigated their warping behavior, thoroughly. This study aims to investigate, in detail, the warping behavior of strip-shaped FREIs by deriving advanced analytical solutions without utilizing the commonly used "pressure", incompressibility, inextensibility and the "linear axial displacement variation through the thickness" assumptions. Studies show that the warping behavior of FREIs mainly depends on the (i) aspect ratio (shape factor) of the interior elastomer layers, (ii) Poisson's ratio of the elastomer and (iii) extensibility of the fiber sheets. The basic assumptions of the "pressure" method as well as the commonly used incompressibility assumption are valid only for isolators with relatively large shape factors, strictly incompressible elastomeric material and nearly inextensible fiber reinforcement.

키워드

참고문헌

  1. Angeli, P., Russo, G. and Paschini, A. (2013), "Carbon fiberreinforced rectangular isolators with compressible elastomer: Analytical solution for compression and bending", Int. J. Solid. Struct., 50(22-23), 3519-3527. https://doi.org/10.1016/j.ijsolstr.2013.06.016
  2. Gent, A.N. and Lindley, P.B. (1959), "The compression of bonded rubber blocks", P. I. Mech.l Eng., 173(3), 111-122.
  3. Kelly, J.M. (1994), The influence of Plate Flexibility on the Buckling Load of Elastomeric Isolators, Report UCB/EERC-94/03, Earthquake Engineering Research Center, University of California, Berkeley, California, USA.
  4. Kelly, J.M. (1997), Earthquake Resistant Design with Rubber, Springer-Verlag, London.
  5. Kelly, J.M. (1999), "Analysis of fiber-reinforced elastomeric isolators", J. Seismol. Earthq. Eng., 2(1), 19-34.
  6. Kelly, J.M. and Takhirov, S.M. (2001), Analytical and Experimental Study of Fiber-Reinforced Elastomeric Isolators, PEER Report 2001/11, Pacific Earthquake Engineering Research Center, University of California, Berkeley, California, USA.
  7. Kelly, J.M. (2002), "Seismic isolation systems for developing countries", Earthq. Spectra, 18(3), 385-406. https://doi.org/10.1193/1.1503339
  8. Kelly, J.M. and Konstantinidis D. (2011), Mechanics of Rubber Bearings for Seismic and Vibration Isolation, John Wiley and Sons Ltd, UK.
  9. Kelly, J.M. and Calabrese, A. (2012). Mechanics of Fiber Reinforced Bearings, PEER Report 2012/101, Pacific Earthquake Engineering Research Center, University of California, Berkeley, California, USA.
  10. Mengi, Y. (1980), "A new approach for developing dynamic theories for structural elements Part 1: Application to thermoelastic plates", Int. J. Solid. Struct., 16(12), 1155-1168. https://doi.org/10.1016/0020-7683(80)90070-0
  11. Osgooei, P.M., Tait, M.J. and Konstantinidis, D. (2014), "Threedimensional finite element analysis of circular fiber-reinforced elastomeric bearings under compression", Compos. Struct., 108, 191-204. https://doi.org/10.1016/j.compstruct.2013.09.008
  12. Osgooei, P.M., Engelen, N.C.V., Konstantinidis, D. and Tait, M.J. (2015), "Experimental and finite element study on lateral response of modified rectangular fiber-reinforced elastomeric isolators (MR-FREIs)", Eng. Struct., 85, 293-303. https://doi.org/10.1016/j.engstruct.2014.11.037
  13. Pinarbasi, S., Akyuz, U. and Mengi, Y. (2006), "A new formulation for the analysis of elastic layers bonded to rigid surfaces", Int. J. Solid. Struct., 43(14), 4271-4296. https://doi.org/10.1016/j.ijsolstr.2005.06.047
  14. Pinarbasi, S. and Mengi, Y. (2008), "Elastic layers bonded to flexible reinforcements", Int. J. Solid. Struct., 45(3), 794-820. https://doi.org/10.1016/j.ijsolstr.2007.08.029
  15. Pinarbasi, S., Mengi, Y. and Akyuz, U. (2008), "Compression of solid and annular circular discs bonded to rigid surfaces", Int. J. Solid. Struct., 45(16), 4543-4561. https://doi.org/10.1016/j.ijsolstr.2008.03.026
  16. Pinarbasi, S. and Okay, F. (2011), "Compression of hollowcircular fiber-reinforced rubber bearings", Struct. Eng. Mech, 38(3), 361-384. https://doi.org/10.12989/sem.2011.38.3.361
  17. Toopchi-Nezhad, H., Tait, M.J. and Drysdale, R.G. (2011), "Bonded versus unbonded strip fiber reinforced elastomeric isolators: finite element analysis", Compos. Struct., 93(2), 850-859. https://doi.org/10.1016/j.compstruct.2010.07.009
  18. Toopchi-Nezhad, H. (2014), "Horizontal stiffness solutions for unbonded fiber reinforced elastomeric bearings", Struct. Eng. Mech., 49(3), 395-410. https://doi.org/10.12989/sem.2014.49.3.395
  19. Tsai, H.C. and Kelly, J.M. (2005), "Buckling load of seismic isolators affected by flexibility of reinforcement", Int. J. Solid. Struct., 42(1), 255-269. https://doi.org/10.1016/j.ijsolstr.2004.07.020
  20. Tsai, H.C. (2007), "Tilting analysis of circular elastic layers interleaving with flexible reinforcements", Int. J. Solid. Struct., 44(18-19), 6318-6329. https://doi.org/10.1016/j.ijsolstr.2007.02.028
  21. Yasser, M.A.A. and Tait, M.J. (2015), "A numerical study on compressive and rotational behavior of fiber reinforced elastomeric isolators (FREI)", Compos. Struct., 133, 1249-1266. https://doi.org/10.1016/j.compstruct.2015.07.042

피인용 문헌

  1. Seismic rehabilitation of cultural heritage masonry buildings with unbonded fiber reinforced elastomeric isolators (U-FREIs) – A case of study 2018, https://doi.org/10.1016/j.culher.2017.09.015
  2. Finite element modeling of horizontal load-displacement hysteresis loops in unbonded elastomeric isolators vol.34, pp.None, 2017, https://doi.org/10.1016/j.istruc.2021.08.095