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221
Earthquake
Sylmar 90
Sylinar 90
Sylmar 90
Newhall 90
Newhall 90
NewhaU 90
El Centro
El Centre
El Centre
MRD
0.0 V
40V
Control
0.0 V
4.0V
Control
0.0 V
4.0V
Control
Table 4 Continued
Base Ace. (g) First Fl Acc.(g)
0.38 0.296 0.384 0.478
0.43 0.324 0.482 0.576
0.40 0.32 0.481 0.515
0.42 0.56 0.484 0.359
0.565 0.75 L 0.544 0.60
0.58 0.73 0762 0.60
0.44 0.192 0.301 0.497
0.40 0.308 0.364 0.541
0.38 0.282 0.344 0.54
Sec. Fl. Ace. (g)
0.333 0.48
0.435 0.55
0.412 0.51
0.359 0.551
0.59 0.785
0.609 0.774
0.352 0.45
0.66 0.76
0.66 0.75
Conclusions
Analytical study of smart sliding isolated structure with MR dampers is presented. New detailed nonlinear
analytical models for the smart sliding isolated structure and MR damper are developed and the solution
procedure is presented. The analytical results are verified using shake table test results. The response to
several near fault earthquakes is presented. From the presented analytical and experimental results T it is
evident that the smart sliding isolation system with MR dampers is capable of reducing the base displacement
response and the total isolation force further to the passive high damping case, while maintaining the
interstory drifts and accelerations within bounds
Acknowledgments
Funding for this project provided by the National Science Foundation CAREER Grant (CMS-996290),
with Dr. S. C. Liu and Dr P. Chang as program directors, is gratefully acknowledged
References
Gavin, H. and Aldernir, U. (2001). "Behavior and response of auto-adaptive seismic isolation," Proc. U.
S. Japan Workshop in Urban Earthquake Disaster Mitigation, Seattle, WA.
Maddan, G. J., Wongprasert, N., and Symans, M. D. (2000). "Adaptive seismic isolation systems for
structures subjected to disparate earthquake ground motions,'" Proc. Structures Congress, ASCE, Philadelphia
Ṅagarajaiah, S, Sahasrabudhe, S., and Iyer, R. (2000). "Seismic Response of Sliding Isolated Bridges with
Smart Dampers Subjected to Near Source Ground Motions," Proc. Structures Congress, ASCE, Philadelphia.
Sahasrabudhe, S., Nagarajaiah, S., and Hard, C. (2000). "Experimental Study of Sliding Isolated Buildings
with Smart Dampers," Proc.Eng. Mech. Conf., ASCE, UT Austin.
Sahasrabudhe, S., and Nagarajaiah, S. (2001)."Sliding Isolated Buildings with Smart Dampers: Shake
Table Studies," Proc. Structures Congress, ASCE, Washington D. C.
Spencer, B.F, Johnson, R. A., and Ramallo, J. C., (2000)."Smart isolation for seismic control," JSME
Int. J. Series C-Mech. Sys. Machine Elem. And Manufacturing, 43 (7), 704-711.
Taylor, D. P., and Constantinou, M. C. (2001). "Fluid Dampers for Applications of Seismic Energy
Dissipation and Seismic Isolation" Taylor Devices Inc., also see http://www.taylordevices.com/.
Yang, J. N., and Agrawal, A. K. (2002)."Semiactive hybrid control systems for nonlinear buildings against
near-field earthquakes," Eng. Structures, 24 (3): 271-280.
Yoshioka, H., Ramallo, J. C.; and B. F. Spencer Jr. (2002). "Smart Base Isolation Strategies Employing
Magnetorheological Dampers," J. of Eng. Mechanics, ASCE, Vol. 128, No. 5.