Abstract
A numerical approach for the determination of (a) the shear behavior under large displacements and (b) the compression elastic modulus of common parallelepiped elastomeric isolators is presented. Particular attention is devoted to the role played by the material used for the rubber pads and their thickness. For them, an experimental data fitting by means of both a nine constants Mooney-Rivlin and a five constants exponential law is utilized, within a Finite Element discretization of the isolator. Having at disposal a few experimental stretch-stress data points for each rubber compound in uniaxial tension, a cubic Bezier spline approach is firstly utilized, to generate numerically a large number of metadata containing the original experimental ones. Then, respectively the nine Mooney-Rivlin and five exponential law constitutive parameters are estimated through a least square approach. Once assessed the models, a full scale rectangular seismic isolator is analyzed when subjected to horizontal actions and normal compression, in order to provide estimates of the initial stiffness and the overall behavior of the isolator undergoing large deformations, using both models and for all the compounds considered. It is found that the global behavior may depend significantly on the material hypothesis assumed to model rubber and on pads thickness.
Access provided by Autonomous University of Puebla. Download to read the full chapter text
Chapter PDF
Similar content being viewed by others
Keywords
References
Amin, A.F.M.S., Alam, M.S., Okui, Y.: An improved hyperelasticity relation in modeling viscoelasticity response of natural and high damping rubbers in compression: experiments, parameter identification, and numerical verification. Mech. Mater. 34, 75–95 (2002)
Amin, A.F.M.S., Wiraguna, I., Bhuiyan, A.R., Okui, Y.: Hyperelasticity Model for Finite Element Analysis of Natural and High Damping Rubbers in Compression and Shear. Journal of Engineering Mechanics ASCE 132(1), 54–64 (2006)
ASTM D2240-91. Standard test method for fubber property- Durometer hardness. Annual book of ASTM standard, 388–391 (1992)
Braga, F., Dolce, M., Ferrigno, A., Laterza, M., Marotta, G., Masi, A., Nigro, D., Ponzo, F.: Development of new materials for seismic isolation and passive energy dissipation - part i: experimental tests on new compound elastomeric bearings. In: Proc. International Post-SMiRT Conference Seminar on Seismic Isolation, Passive Energy Dissipation and Active Control of Seismic Vibrations of Structures Taormina, Italy (1997)
British Standard 903 (1950, 1957). Methods of testing vulcanized rubber, Part 19 (1950) and Part A7 (1957)
Bueche, F.: Mullins effect and rubber-filler interaction. Journal of Applied Polymer Science 5(15), 271–281 (1961)
De Luca, A., Imbimbo, M.: F. E. stress analysis of rubber bearings under axial loads. Computers and Structures 68, 31–39 (1998)
Gent, A.N.: Rubber elasticity: basic concepts and behavior. In: Eirich, F.R. (ed.) Science and Technology Rubber. Academic Press, NY (1978)
Tsai, H.-C.: Compression analysis of rectangular elastic layers bonded between rigid plates. International Journal of Solids and Structures 42(11-12), 3395–3410 (2005)
Kelly, J.M.: Base Isolation of Structures. Design Guidelines. Holmes Consulting Group Ltd., Wellington (2001)
Milani, G., Milani, F.: Stretch-stress behavior of elastomeric seismic isolators with different rubber materials. A numerical insight. Journal of Engineering Mechanics ASCE 138(5), 416–429 (2012a)
Milani, G., Milani, F.: Elastomeric seismic isolators behavior at different pads thickness. In: Pina, N., Kacprzyk, J. (eds.) Proc. 2nd International Conference on Simulation and Modeling Methodologies, Technologies and Applications, Rome, IT, July 28-31 (2012b)
Moon, B.Y., Kang, G.J., Kang, B.S., Kim, G.S., Kelly, J.M.: Mechanical properties of seismic isolation system with fiber-reinforced bearing of strip type. International Applied Mechanics 39(10), 1231–1239 (2003)
Mooney, M.: A theory of large elastic deformation. J. Appl. Physics 2, 582–592 (1940)
OPCM 3431: Ulteriori modifiche ed integrazioni all’OPCM 3274/ 03 20/03/2003. Primi elementi in materia di criteri generali per la classificazione sismica del territorio nazionale e di normative tecniche per le costruzioni in zona sismica (2005) (in Italian)
Qi, H.J., Joyce, K., Boyce, M.C.: Durometer hardness and the stress-strain behavior of elastomeric materials. Rubber Chemistry and Technology 72(2), 419–435 (2003)
Studebaker, M.L., Beatty, J.R.: The rubber compound and its composition. In: Eirich, F.R. (ed.) Science and Technology of Rubber. Academic Press, NY (1978)
Tobolsky, A.V., Mark, H.F.: Polymer Science and Materials, ch. 13. Wiley, New York (1971)
Tsai, H.S., Kelly, J.M.: Stiffness Analysis of Fiber-Reinforced Rectangular Seismic Isolators. Journal of Engineering Mechanics ASCE 128(4), 462–470 (2002)
Tsai, H.S., Lee, C.C.: Tilting stiffness of elastic layers bonded between rigid plates. International Journal of Solids and Structures 36(17), 2485–2505 (1999)
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2014 Springer International Publishing Switzerland
About this chapter
Cite this chapter
Milani, G., Milani, F. (2014). Behavior of Elastomeric Seismic Isolators Varying Rubber Material and Pad Thickness: A Numerical Insight. In: Obaidat, M., Filipe, J., Kacprzyk, J., Pina, N. (eds) Simulation and Modeling Methodologies, Technologies and Applications. Advances in Intelligent Systems and Computing, vol 256. Springer, Cham. https://doi.org/10.1007/978-3-319-03581-9_4
Download citation
DOI: https://doi.org/10.1007/978-3-319-03581-9_4
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-03580-2
Online ISBN: 978-3-319-03581-9
eBook Packages: EngineeringEngineering (R0)