Theoretical, Numerical and Experimental Assessment of Elastomeric Bearing Stability

Authors: Manuel A. Guzman, Davide Forcellini, Ricardo Moreno, Diego H. Giraldo

Abstract:

Elastomeric bearings (EB) are used in many applications, such as base isolation of bridges, seismic protection and vibration control of other structures and machinery. Their versatility is due to their particular behavior since they have different stiffness in the vertical and horizontal directions, allowing to sustain vertical loads and at the same time horizontal displacements. Therefore, vertical, horizontal and bending stiffnesses are important parameters to take into account in the design of EB. In order to acquire a proper design methodology of EB all three, theoretical, finite element analysis and experimental, approaches should be taken into account to assess stability due to different loading states, predict their behavior and consequently their effects on the dynamic response of structures, and understand complex behavior and properties of rubber-like materials respectively. In particular, the recent large-displacement theory on the stability of EB formulated by Forcellini and Kelly is validated with both numerical simulations using the finite element method, and experimental results set at the University of Antioquia in Medellin, Colombia. In this regard, this study reproduces the behavior of EB under compression loads and investigates the stability behavior with the three mentioned points of view.

Keywords: Elastomeric bearings, experimental tests, numerical simulations, stability, large-displacement theory.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.2021621

References:

[1] O. Hamzeh, J. L. Tassoulas, and E. B. Becker, “Analysis of Elastomeric Bridge Bearings,” 1995.
[2] B. A. English, R. E. Klingner, and J. A. Yura, “Elastomeric Bearings: Background information and field study,” 1993.
[3] J. F. Stanton and C. W. Roeder, “NCHRP Report 248 - Elastomeric bearings design, construction, and materials,” 1982.
[4] C. W. Roeder, J. F. Stanton, and A. W. Taylor, “NCHRP Report 298 - Performance of elastomeric bearings,” 1987.
[5] American Association of State Highway and Transportation Officials, “AASHTO LRFD Bridge Design Specifications,” 2012.
[6] C. G. Koh and J. M. Kelly, “A simple mechanical model for elastomeric bearings used in base isolation,” Int. J. Mech. Sci., vol. 30, no. 12, pp. 933–943, 1988.
[7] S. Nagarajaiah and K. Ferrell, “Stability of Elastomeric Seismic Isolation Bearings,” J. Struct. Eng., vol. 125, pp. 946–954, 1999.
[8] D. Forcellini and J. M. Kelly, “Analysis of the large deformation stability of elastomeric bearings,” J. Eng. Mech., vol. 140, no. 6, pp. 1–10, 2014.
[9] S. M. V. Vemuru, S. Nagarajaiah, A. Masroor, and G. Mosqueda, “Dynamic Lateral Stability of Elastomeric Seismic Isolation Bearings,” J. Struct. Eng., pp. 1–14, 2014.
[10] V. S. M. Vemuru, S. Nagarajaiah, and G. Mosqueda, “Coupled horizontal–vertical stability of bearings under dynamic loading,” Earthq. Eng. Struct. Dyn., vol. 45, pp. 913–934, 2015.
[11] X. Han and G. P. Warn, “Mechanistic model for simulating critical behavior in elastomeric bearings,” J. Struct. Eng., vol. 141, no. 5, p. 4014140, 2015.
[12] M. Iizuka, “A macroscopic model for predicting large-deformation behaviors of laminated rubber bearings,” Eng. Struct., vol. 22, no. 4, pp. 323–334, 2000.
[13] M. Kikuchi, T. Nakamura, and I. D. Aiken, “Three-dimensional analysis for square seismic isolation bearings under large shear deformations and high axial loads Masaru,” Earthq. Eng. Struct. Dyn., vol. 39, pp. 1513–1531, 2010.
[14] J. A. Haringx, “On highly compressible helical springs and rubber rods and their application for vibration-free mountings,” Phillips Res. Reports, vol. Rep. 3, pp. 401–449, 1949.
[15] A. N. Gent, “Elastic stability of rubber compression springs,” J. Mech. Eng. Sci., vol. 6, no. 4, pp. 415–430, 1964.
[16] G. P. Warn and J. Weisman, “Parametric finite element investigation of the critical load capacity of elastomeric strip bearings,” Eng. Struct., vol. 33, no. 12, pp. 3509–3515, 2011.
[17] M. Kumar, A. S. Whittaker, and M. C. Constantinou, “Mechanical Properties of Elastomeric Seismic Isolation Bearings for Analysis Under Extreme loading,” in 22nd Conference on Structural Mechanics in Reactor Technology, 2013.
[18] R. Z. Wang, S. K. Chen, K. Y. Liu, C. Y. Wang, K. C. Chang, and S. H. Chen, “Analytical Simulations of the Steel-Laminated Elastomeric Bridge Bearing,” J. Mech., vol. 30, no. 4, pp. 373–382, 2015.
[19] D. Forcellini, “3D Numerical simulations of elastomeric bearings for bridges,” Innov. Infrastruct. Solut., vol. 1, no. 1, p. 45, 2016.
[20] D. Forcellini, S. Mitoulis, and K. N. Kalfas, “Study on the response of elastomeric bearings with 3D numerical simulations and experimental validation,” in 6th ECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, 2017, p. 9.
[21] K. N. Kalfas and S. A. Mitoulis, “Performance of steel-laminated rubber bearings subjected to combinations of axial loads and shear strains,” Procedia Eng., vol. 199, pp. 2979–2984, 2017.
[22] D. Najjar, A. Kaadan, M. N. A. Eilouch, and A. Al Helwani, “Multi-criteria decision making to improve the performance of base isolation rubber bearing,” Asian J. Civ. Eng., vol. 18, no. 7, pp. 1095–1112, 2017.
[23] W. Yang, X. Sun, M. Wang, and P. Liu, “Vertical stiffness degradation of laminated rubber bearings under lateral deformation,” Constr. Build. Mater. vol. 152, pp. 310–318, 2017.
[24] A. Mori, A. J. Carr, N. Cooke, and P. J. Moss, “Compression behaviour of bridge bearings used for seismic isolation,” Eng. Struct., vol. 18, no. 5, pp. 351–362, 1996.
[25] H.-W. Chou and J.-S. Huang, “Effects of Cyclic Compression and Thermal Aging on Dynamic Properties of Neoprene Rubber Bearings,” J. Appl. Polym. Sci., vol. 107, pp. 1635–1641, 2007.
[26] G. C. Manos, S. Mitoulis, V. Kourtidis, A. Sextos, and I. Tegos, “Study of the behavior of Steel Laminated Rubber Bearings under prescribed loads,” in 10th World Conference on Seismic Isolation, Energy Dissipation and Active Vibrations Control of Structures, 2007, vol. 2, p. 12.
[27] J. Oh and J. H. Kim, “Prediction of long-term creep deflection of seismic isolation bearings,” J. Vibroengineering, vol. 19, no. 1, pp. 355–363, 2017.
[28] S. L. Burtscher and A. Dorfmann, “Compression and shear tests of anisotropic high damping rubber bearings,” Eng. Struct., vol. 26, no. 13, pp. 1979–1991, 2004.
[29] P. M. Sheridan, F. O. James, and T. S. Miller, “Design of Components,” in Engineering with Rubber - How to Design Rubber Components, Third Edit., A. N. Gent, Ed. Carl Hanser Verlag GmbH & Co. KG, 2012, pp. 259–293.
[30] ASTM, D575-91: Standard Test Methods for Rubber Properties in Compression. 2012, pp. 1–4.
[31] ASTM, D945-06: Standard Test Methods for Rubber Properties in Compression or Shear (Mechanical Oscillograph). 2012, pp. 1–11.
[32] D. O. Fediuc, M. Budescu, V. Fediuc, and V.-M. Venghiac, “Compression Modulus of Elastomers,” Bull. Polytech. Inst. Jassy, vol. 62, pp. 157–166, 2013.
[33] S. Mazzoni, F. McKenna, M. H. Scott, and G. L. Fenves, “OpenSees, Open System for Earthquake Engineering Simulation.” University of Berkley, 2011.
[34] J. Lu, A. Elgamal, and Z. Yang, “OpenSeesPL - 3D Lateral Pile-Ground Interaction.” 2012.