Experimental Study of Secondary Systems in Base‐Isolated Structure
Publication: Journal of Structural Engineering
Volume 118, Issue 8
Abstract
This work investigates the response of secondary systems attached to a base‐isolated, six‐story model structure that is subjected to base motions. The secondary systems are modeled by cantilevered, inverted pendulums. They have natural frequencies and mass ratios that span a wide range of values. The scaled model structure is base‐isolated through the use of sliding Teflon disc bearings coupled with restoring helical springs. The structural system is placed on a seismic simulator and is subjected to several prerecorded earthquake accelerograms. Time histories and frequency spectra for the secondary systems and their supporting floors are presented. Subsequently, a numerical model is developed to reproduce the results obtained from the experiments. The level of agreement between numerical and experimental results indicates that the numerical model can be used for the construction of floor response spectra (FRS) for the secondary systems. The experimental results and the numerical studies show that under most circumstances, this novel structural base isolation system reduces the effects of vibrations in the secondary systems.
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References
1.
“An assessment of the consequences and preparations for a catastrophic California earthquake: Findings and actions taken.” (1981). FEMA Report, Federal Emergency Management Agency, Washington, D.C.
2.
Biggs, J. M. (1971). “Seismic response spectra for equipment design in nuclear power plants.” Proc., First SMIRT Conf.
3.
Bouc, R. (1971). “Modele mathematique d'hysteresis.” Acoustica, 24, 16–25 (in French).
4.
Chalhoub, M. S., and Kelly, J. M. (1990), “Sliders and tension controlled reinforced elastomeric bearings combined for earthquake isolation.” Earthquake Engrg. Struct. Dyn., 19(3), 333–344.
5.
Chen, Y. Q., and Soong, T. T. (1988). “State‐of‐the‐art review: Seismic response of secondary systems.” Engrg. Struct., 10(4), 218–228.
6.
Constantinou, M. C., Mokha, A. S., and Reinhorn, A. M. (1990a). “Teflon bearings in base isolation. II: Modeling.” J. Struct. Engrg., ASCE, 116(2), 455–474.
7.
Constantinou, M. C., Mokha, A. S., and Reinhorn, A. M. (1990b). “Experimental and analytical study of a combined sliding disc bearing and helical steel spring isolation system.” NCEER Report No. 90–0019, National Center for Earthquake Engineering Research, Buffalo, N.Y.
8.
Constantinou, M. C., Mokha, A. S., and Reinhorn, A. M. (1991). “Study of a sliding bearing and helical steel spring isolation system.” J. Struct. Engrg., ASCE, 117(4), 1257–1275.
9.
Der Kiureghian, A., Sackman, J. L., and Nour‐Omid, B. (1983). “Dynamic analysis of light equipment in structures: Response to stochastic input.” J. Engrg. Mech., ASCE, 109(1), 90–110.
10.
Dermitzakis, S. N., and Mahin, S. A. (1985). “Development of substructuring techniques for on‐line computer controlled seismic performance testing.” Report No. UCB/EERC‐85/04, Earthquake Engineering Research Center, University of California, Berkeley, Calif.
11.
Fan, F. G., and Ahmadi, G. (1990). “Floor response spectra for base‐isolated multistory structures.” Earthquake Engrg. Struct. Dyn., 19(3), 377–388.
12.
Igusa, T., and Der Kiureghian, A. (1985). “Dynamic response of multiply supported secondary systems.” J. Engrg. Mech., ASCE, 111(1), 20–41.
13.
Kawamura, S., Kitazawa, K., Hisano, M., and Nagashima, I. (1988). “Study of a sliding‐type base isolation system: System composition and element properties.” Proc., 9th World Conf. on Earthquake Engineering, Vol. 5, 735–740.
14.
Kelly, J. M. (1982). “The influence of base isolation on the seismic response of light secondary equipment.” Report No. UCB/EERC‐81/17, Earthquake Engineering Research Center, University of California, Berkeley, Calif.
15.
Kelly, J. M. (1986). “Aseismic base isolation: Review and bibliography.” Soil Dyn. Earthquake Engrg., 5(3), 202–216.
16.
Kelly, J. M., and Chitty, D. E. (1980). “Control of seismic response of piping systems and components in power plants by base isolation.” Engrg. Struct., 2(13), 187–198.
17.
Kelly, J. M., and Sackman, J. L. (1978). “Response spectra design methods for tuned equipment‐structure systems.” J. Sound Vib., 59(2), 171–179.
18.
Kelly, J. M., and Tsai, H. C. (1985). “Seismic response of light internal equipment in base‐isolated structures.” Earthquake Engrg. Struct. Dyn., 13(6), 711–732.
19.
Lin, J., and Mahin, S. A. (1985). “Seismic response of light subsystems on inelastic structures.” J. Struct. Engrg., ASCE, 111(2), 400–417.
20.
Manolis, G. D., and Juhn, G., Constantinou, M. C., and Reinhorn, A. M. (1990). “Secondary systems in base‐isolated structures: Experimental investigation stochastic response and stochastic sensitivity.” NCEER Report No. 90–0013, National Center for Earthquake Engineering Research, Buffalo, N.Y.
21.
Manolis, G. D., Juhn, G., and Reinhorn, A. M. (1988). “Experimental investigation of primary‐secondary system interaction.” NCEER Report No. 88–0019, National Center for Earthquake Engineering Research, Buffalo, N.Y.
22.
Mokha, A., Constantinou, M. C., and Reinhorn, A. M. (1990). “Teflon bearings in aseismic base isolation. I: Testing.” J. Struct. Engrg., ASCE, 116(2), 438–454.
23.
Mokha, A., Constantinou, M. C., and Reinhorn, A. M., and Zayas, V. (1991). “Experimental study of friction pendulum isolation system.” J. Struct. Engrg., ASCE, 117(4), 1201–1217.
24.
Mostaghel, N., and Khodaverdian, M. (1987). “Dynamics of resilient friction base isolator (R‐FBI).” Earthquake Engrg. Struct. Dyn., 15(. 3), 379–390.
25.
Reinhorn, A. M., Soong, T. T., Lin, R. C. Wang, W. P., Fukao, Y., Abe, H., and Nakai, M. (1989). “1:4 scale model studies of active tendon system and active mass dampers for aseismic protection.” NCEER Report No. 89–2006, National Center for Earthquake Engineering Research, Buffalo, N.Y.
26.
Sackman, J. L., and Kelly, J. M. (1980). “Equipment response spectra for nuclear power plant systems.” Nucl. Engrg. Des., 57(2), 277–294.
27.
Singh, M. P. (1975). “Generation of floor response spectra.” J. Engrg. Mech. Div., ASCE, 101(5), 593–607.
28.
Singh, M. P. (1988). “Seismic design of secondary systems.” Probal. Engrg. Mech., 3(3), 151–158.
29.
Suarez, L. E., and Singh, M. P. (1987). “Eigenproperties of nonclassically damped primary structure and equipment systems by a perturbation approach.” Earthquake Engrg. Struct. Dyn., 15(5), 565–583.
30.
Suarez, L. E., and Singh, M. P. (1988). “Dynamic synthesis of nonclassically damped substructures.” J. Engrg. Mech., ASCE, 115(1), 52–70.
31.
Zayas, V., Low, S. S., and Mahin, S. A. (1987). “The FPS earthquake resisting system: Experimental report.” Report No. UCB/EERC‐87/01, Earthquake Engineering Research Center, University of California, Berkeley, Calif.
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Copyright © 1992 ASCE.
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Published online: Aug 1, 1992
Published in print: Aug 1992
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