Teflon Bearings in Base Isolation II: Modeling
Publication: Journal of Structural Engineering
Volume 116, Issue 2
Abstract
A mathematical model of the factional behavior of Teflon sliding bearings for conditions of interest in base isolation is developed. The calibration of the model is based on extensive experimental data that were presented in an accompanying paper. The model is capable of accounting for: (1) Unidirectional and multidirectional motion at the Teflon‐steel interface; (2) velocity and pressure dependence of the coefficient of sliding friction; and (3) breakaway (or static) friction effects. The model is characterized by four parameters. These are the minimum and maximum values of the sliding coefficient of friction, the ratio of breakaway to sliding coefficient of friction at initiation of sliding and a parameter that describes the variation of the sliding coefficient of friction with velocity. Values of these parameters are presented for sixteen combinations of type of Teflon, bearing pressure and condition (surface roughness) of mating steel surface. Applications of the model in the analysis/design of a sliding isolation system are presented and the effects of bearing pressure and breakaway friction are evaluated. Furthermore, an assessment of the implications of using Coulomb's constant friction model rather than the developed model is presented.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
Bouc, R. (1971). “Modele mathematique d'hysteresis.” Acustica, 24(1), 16–25 (in French).
2.
Buckle, I. G. (1986). “Development and application of base isolation and passive energy dissapation: A world overview.” Proc. of ATC‐17 Seminar on Base Isolation and Passive Energy Dissipation, Applied Technology Council, San Francisco, Calif., 153–174.
3.
Caspe, M. S., and Reinhorn, A. M. (1986). “The earthquake barrier. A solution for adding ductility to otherwise brittle buildings.” Proc. of ATC‐17 Seminar on Base Isolation and Passive Energy Dissipation, Applied Technology Council, San Francisco, Calif., 331–342.
4.
Constantinou, M. C. (1988). “Overview of base isolation study tour of Japan.” Report to the National Center for Earthquake Engineering Research, Dept. of Civ. Engrg., State Univ. of New York, Buffalo, N.Y., Jun.
5.
Constantinou, M. C., and Adnane, M. A. (1987). “Dynamics of soil‐based‐isolated structure systems: Evaluation of two models for yielding systems.” Report to the National Science Foundation, Dept. of Civ. Engrg., Drexel Univ., Philadelphia, Pa.
6.
Constantinou, M. C., and Mokha, A. (1989). “A model of friction of Teflon sliding bearings.” Report to the National Science Foundation, Dept. of Civ. Engrg., State Univ. of New York, Buffalo, N.Y., Apr.
7.
Constantinou, M. C., Reinhorn, A. M., and Watson, R. (1988). “Teflon bearings in aseismic base isolation: Experimental studies.” Seismic, Shock and Vibration Isolation‐1988‐Pressure, Vessels and Piping Conference, American Society of Mech. Engrg., 147, 9–13.
8.
Fan, F.‐G., et al. (1988). “Performance analysis of aseismic base isolation systems for a multistory building.” Report No. MIE‐165, Clarkson Univ., Potsdam, N.Y.
9.
Feldstein, A., and Goodman, R. (1973). “Numerical solution of ordinary and retarded differential equations with discontinuous derivatives.” Numerische Mathematik, 21(1), 1–13.
10.
Ikonomou, A. S. (1985). “Alexisismon isolation engineering for nuclear power plants.” Nuclear Engrg. and Design, 85(2), 201–216.
11.
Kelly, J. M. (1986). “Aseismic base isolation: Review and bibliography.” Soil Dynamics and Earthquake Engrg., 5(3), 202–216.
12.
Mokha, A., Constantinou, M. C., and Reinhorn, A. M. (1988). “Teflon bearings in Aseismic base isolation: Experimental studies and mathematical modeling.” Report No. NCEER‐880038, Nat. Center for Earthqauke Engrg. Res., State Univ. of New York, Buffalo, N.Y., Dec.
13.
Mostaghel, N., and Khodaverdian, M. (1987). “Dyanmics of resilient‐friction base isolator (R‐FBI).” Earhquake Engrg. and Struct. Dynamics, 15(3), 379–390.
14.
Nagashima, I., et al. (1987). “Study on a base isolation system.” Proc. 3rd Conference on Soil Dynamics and Earthquake Engrg., Princeton Univ., Princeton, N.J.
15.
Ozdemir, H. (1976). “Nonlinear transient dynamic analysis of yielding structures,” thesis presented to the University of California, at Berkeley, Calif., in partial fulfillment of the requirements for the degree of Doctor of Philosophy.
16.
Park, Y. J., Wen, Y. K., and Ang, A. H.‐S. (1985). “Random vibration of hysteretic systems under bi‐directional ground motions.” Earthquake Engrg. and Struct. Dynamics, 14(4), 543–557.
17.
Su, L., Ahmadi, G., and Tadjbakhsh, I. G. (1987). “A comparative study of base isolation systems.” Report No. MIE‐150, Clarkson Univ., Potsdam, N.Y., Aug.
18.
“Wabo‐Fyfe Earthquake Protection System” . (1981). Watson Bowman Acme Corp., Amherst, N.Y.
19.
Wen, Y. K. (1976). “Method of random vibration of hysteretic systems.” J. Engrg. Mech. Div., ASCE, 102(2), 249–263.
20.
Yasaka, A., et al. (1988). “Biaxial hysteresis model for base isolation devices.” Internal Report, Kajima Institute of Construction Technology, Kajima Corporation, Tokyo, Japan.
21.
Younis, C., Tadjbakhsh, I. G., and Saibel, E. A. (1983). “Analysis of general plane motion with Coulomb friction.” Wear, 91(3), 319–331.
22.
Zayas, V., Low, S., and Mahin, S. (1987). “The FPS earthquake protection system: Experimental report.” Report No. UCB/EERC‐87/01, Earthquake Engineering Research Center, Univ. of California, Berkeley, Calif., Jun.
Information & Authors
Information
Published In
Copyright
Copyright © 1990 ASCE.
History
Published online: Feb 1, 1990
Published in print: Feb 1990
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.