Corrective Analysis of the Parametric Values from Dynamic Testing on Stand of the Antiseismic Elastomeric Isolators in Correlation with the Real Structural Supporting Layout

Abstract:

The paper presents the result of experimental research of the viscoelastic behavior of the antiseismic elastomeric isolators on stand, in laboratory, where the excitation is given only through harmonic instantaneous displacements. Based on the dynamic response under the form of the elastic and dissipation forces, in the time domain, the hysteresis loops and the stiffness, damping and durability to imposed repeated cycles parameters are determined. In this case, the order I dynamic system is free of added mass which makes the evaluation of its own damping to be estimated as equivalent damping with that of a complete system of 2^nd order with viscous damping.Using elastomeric isolators on site, for a base isolation project, either building or viaduct, imposes corrections of the experimental laboratory values considering the real conditions, function of the dynamic inertial excitation (earthquake, wind gusts, etc.) and of the response in instantaneous displacements.

• Periodical: Applied Mechanics and Materials (Volume 430)
• Pages: 305-311
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.430.305
• Online since: September 2013
• Authors: Polidor Bratu
• Keywords: Dynamic Excitation, Isolators, Kinematic Excitation, Laboratory Testing

References

[1] EI. Rivice, Stiffness and Damping in Mechanical Design, Marcel Dekker Inc., New York, (1999).

[2] P. Bratu, Analiza structurilor elastice. Comportarea la actiuni statice si dinamice., Editura IMPULS, Bucuresti, (2011).

[3] MJ. Kelly, AD. Konstantinidis, Mechanics of Rubber Bearings for Seismic and Vibration Isolation, Wiley, (2011).

[4] P. Bratu, N. Drăgan, L'analyse des mouvements désaccouplés appliquée au modèle de solide rigide aux liaisons élastiques, Analele Universitatii Dunarea de Jos, of Galati, Fascicula XIV, (1997).

DOI: 10.35219/im.2017.2.04

[5] P. Bratu, O. Vasile, Modal analysis of viaducts supported on elastomeric insulation within the Bechtel constructive solution for the Transilvania highway, Romanian Journal of Acoustics and Vibration, 9(2012) 77-82.

[6] M. Dolce, FC. Ponzo, A. DiCesare, G. Arleo, Progetto di Edifici con Isolamento Sismico, Iuss Press, Pavia, Italy, (2010).

[7] JP. Bandstra, Comparison of equivalent viscous damping and nonlinear damping in discret and continuous vibrating system, Journal of Mechanisms, Transmissions and Automation in Design, J.V.A.S.R.D., vol I 105, (1983).

DOI: 10.1115/1.3269117

[8] TK. Caughey, MEJ. O'Kelly, Effect of damping on the natural frequencies on linear dynamic systems, Journal of the American Statistical Associating, J.A.S.A., vol. 33, (1961).

[9] I. Cochin, Analysis and Deisign of Dynamic Systems, Harper&Raw, New York, (1980).

[10] S. Rao, Mechanical Vibrations, Addison-Wesley, New York, (1995).

[11] SR EN 15129: 2010, Dispozitive antiseismice, (2010).