Torsional Coupling in Sliding Base‐Isolated Structures
Publication: Journal of Structural Engineering
Volume 119, Issue 1
Abstract
The lateral‐torsional response of base‐isolated structures, with sliding isolation system due to bidirectional lateral ground motion, is studied. The objective of the study is to identify the key system parameters that lead to significant torsional coupling in sliding base‐isolated structures. The analysis procedure adopted can capture the highly nonlinear behavior of sliding systems in plane motion. The nonlinear biaxial stick‐slip characteristics of sliding bearings and the velocity dependence of coefficient of friction are accounted for. The study considers multistoried structures with variable number of bearings subjected to the effects of earthquakes with various frequency content and different peak ground accelerations. It is shown that, although the total superstructure response is reduced significantly due to the effects of sliding base isolation, torsional coupling can be significant depending on the superstructure eccentricity and the lateral‐torsional flexibility of the superstructure and the base.
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References
1.
Buckle, I. G., and Mayes, R. L. (1990). “Seismic isolation: History, application, and performance—World overview.” Earthquake Spectra, 6(2), 161–202.
2.
Campbell, T. I., Pucchio, C. B., Roeder, C. W., and Stanton, J. F. (1991). “Frictional characteristics of PTFE used in slide surfaces of bridge bearings.” Proc. 3rd World Conf. on Bearings for Concrete Structures, American Concrete Institute, 847–870.
3.
Constantinou, M. C., Mokha, A., and Reinhorn, A. M. (1990). “Teflon bearings in base isolation II: Modeling.” J. Struct. Engrg., ASCE, 116(2), 455–474.
4.
Constantinou, M. C., Mokha, A., and Reinhorn, A. M. (1991). “Study of sliding bearing and helical‐steel‐spring isolation system.” J. Struct. Engrg., ASCE, 117(4), 1251–1275.
5.
Eisenberger, M., and Rutenberg, A. (1986). “Seismic isolation of asymmetric shear buildings.” Engrg. Struct., 8(1), 2–8.
6.
Goel, R. K., and Chopra, A. K. (1990). “Inelastic seismic response of one‐storey asymmetric plan systems: Effects of stiffness and strength distribution.” Earthquake Engrg. Struct. Dyn., 19(3), 949–970.
7.
Hart, G. C., Dijulio, R. M., and Lew, M. (1975). “Torsional response of high rise buildings.” J. Struct. Div., ASCE, 101(2), 397–416.
8.
Hisano, M., et al. (1988). “Study of sliding isolation system: Triaxial shaking table test and its simulation.” Proc. Ninth World Conf. on Earthquake Engrg., Japan Association for Earthquake Disaster Prevention, V, 741–746.
9.
Lee, D. M. (1980). “Base isolation for torsion reduction in asymmetric structures under earthquake loading.” Earthquake Eng. Struct. Dyn., 8(3), 349–359.
10.
Mokha, A., Constantinou, M. C., and Reinhorn, A. M. (1993). “Verification of friction model of Teflon bearings under triaxial load.” J. Struct. Engr., ASCE, 119(1).
11.
Mostaghel, N., and Khodaverdian, M. (1988). “Seismic response of structures supported on R‐FBI system.” Earthquake Eng. Struct. Dyn., 16(6), 839–854.
12.
Nagarajaiah, S., Reinhorn, A. M., and Constantinou, M. C. (1990). “Analytical modeling of three dimensional behavior of base isolation devices.” Proc. Fourth U.S. Nat. Conf. on Earthquake Engrg., Earthquake Engrg. Res. Inst., 3, 579–588.
13.
Nagarajaiah, S., Reinhorn, A. M., and Constantinou, M. C. (1991a). “3D‐BASIS: Nonlinear dynamic analysis of 3D‐base isolated structures PART‐II.” Report No. NCEER‐91‐0005, Nat. Ctr. for Earthquake Engrg. Res., Buffalo, N.Y.
14.
Nagarajaiah, S., Reinhorn, A. M., and Constantinou, M. C. (1991b). “Nonlinear dynamic analysis of 3D‐base isolated structures.” J. Struct. Engrg., ASCE, 117(7), 2035–2054.
15.
Najarajaiah, S., Reinhorn, A. M., and Constantinou, M. C. (1992). “Lateral torsional response of base isolated structures: Sliding and elastomeric systems.” Report No. NCEER‐92, Nat. Ctr. for Earthquake Engrg. Res., Buffalo, N.Y.
16.
Pan, T. C., and Kelly, J. M. (1983). “Seismic response of torsionally coupled base isolated structures.” Earthquake Engrg. Struct. Dyn., 11(6), 749–770.
17.
Park, Y. J., Wen, Y. K., and Ang, A. H. S. (1986). “Random vibration of hysteretic systems under bidirectional ground motions.” Earthquake Eng. Struct. Dyn., 14(4),543–557.
18.
Pekau, O. A., and Guimond, R. (1991). “Controlling seismic response of eccentric structures by friction dampers.” Earthquake Eng. Struct. Dyn., 20(6), 505–522.
19.
Reinhorn, A. (1980). “Discussion on paper by Dempsey, K. M. and Irvine, H. M.” Earthquake Eng. Struct. Dyn., 8(1), 75–77.
20.
Reinhorn, A. M., Rutenberg, A., and Gluck, J. (1977). “Dynamic torsional coupling in asymmetric building structures.” Building Environ., 12(4), 251–261.
21.
Sadek, A. W., and Tso, W. K. (1988). “Strength eccentricity concept for inelastic analysis of symmetric structures.” Proc. Ninth World Conf. on Earthquake Engrg., Japan Association for Earthquake Disaster Prevention, V, 91–96.
22.
Su, L., Ahmadi, G., and Tadjbakhsh, I. G. (1989). “A comparative study of performance of various base isolation systems, Part I: Shear beam structures.” Earthquake Eng. Struct. Dyn., 18(1), 11–32.
23.
Zayas, V., Low, S., and Mahin, S. (1987). “The FPS system: Experimental report.” Report No. UCB/EERC‐87‐01, Earthquake Engr. Res. Ctr., Berkeley, Calif.
24.
Zayas, V., Low, S., Bozzo, L., and Mahin, S. (1989). “Feasibility and performance studies on improving the earthquake resistance of buildings using the friction pendulum system.” Report No. UCB/EERC‐89‐09, Earthquake Engrg. Res. Ctr., Berkeley, Calif.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 119 • Issue 1 • January 1993
Pages: 130 - 149
Copyright
Copyright © 1993 American Society of Civil Engineers.
History
Received: Jan 8, 1992
Published online: Jan 1, 1993
Published in print: Jan 1993
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