Comparison of SEAONC Base Isolation Tentative Code to Shake Table Tests
Publication: Journal of Structural Engineering
Volume 116, Issue 4
Abstract
The base isolation subcommittee of the seismology committee of the Structural Engineers Association of Northern California (SEAONC) prepared a tentative code in 1986 for base‐isolated structures. Two main procedures were proposed by the tentative code for the seismic analysis of base‐isolated structures. The first approach uses simplified formulas similar to the equivalent static‐analysis formulas recommended by the uniform building code. The second approach uses dynamic‐analysis procedures (time history and response spectra analyses). In this paper, the values obtained from code‐simplified formulas are compared to experimental results from an earthquake‐simulator testing of a nine‐story steel structure mounted on a combined sliding‐bearing and rubber‐bearing isolation system. Of particular interest is the validity and accuracy of such simplifications when the isolation system is nonlinear. A simplified analysis for base‐isolated structures is possible, and more careful consideration should be given to the ground‐shaking parameters and to the base shear reduction factor.
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References
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Chalhoub, M. S., and Kelly, J. M. (1988). “Earthquake simulator testing of a combined sliding bearing and rubber bearing base isolation system.” Report No. EERC‐87/04, Earthquake Engrg. Res. Center, Univ. of Calif., Berkeley, Calif.
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Newmark, N. M. (1973). “A study of vertical and horizontal spectra.” Report Wash‐1255, U.S. Atomic Energy Commission, Apr.
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Newmark, N. M., and Hall, W. J. (1982). Earthquake spectra and design. Earthquake Engrg. Res. Inst., Berkeley, Calif.
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“Tentative provisions for the development of seismic regulations for buildings.” (1978). ATC3‐06, Appl. Tech. Council, June.
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Tentative seismic isolation design requirements. (1986). Base Isolation Subcommittee of the Seismological Committee of the Struct. Engrs. Association of Northern Calif., Sep.
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Copyright © 1990 ASCE.
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Published online: Apr 1, 1990
Published in print: Apr 1990
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