Mitigation of earthquake hazards using seismic isolation systems Page: 3 of 4
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evident. For earthquake #42, the simulated
transverse acceleration at the first floor of the
isolation building is about 54% of the ordinary
building, whereas in the recorded data it is about
66%. At the roof level, the advantage of base
isolation becomes more pronounced. The
analytical results indicate that, in the transverse
and longitudinal directions, the accelerations of
the isolated building are about 23% and 27% of
the ordinary building. In the observation data the
acceleration ratios are about 26% and 33%. This
further demonstrates that as the floor elevation
increases the degree of acceleration reduction also
To illustrate the effect of the isolation system, Fig.
2 compares both observed and calculated
accelerations in the transverse direction at the roof
level for earthquake #44. As can be seen, the
accelerations are greatly reduced for the isolated
From the results of this study it can be concluded
that the seismic isolation system is very effective
for reducing the earthquake hazard.
This work was supported by the U.S. National
Science Foundation, Agreement No. CES-
Wang, C. Y., et al., 1991, "Seismic Response
Analyses of Base Isolated Structures with High
Damping Elastomeric Bearings," PVP-Vol. 220,
Book No. H00647, San Diego, CA, pp. 15-22.
Table 1. Comparison of Accelerations of Isolated and Ordinary Buildings
Ordinary Bldg., A0 Isol. Bldg., A Accel. Ratio, A1/A
Eq. Obs. Cal. Obs. Cal.
No. Loc. Dir. (gal) (gal) (gal) (gal) Obs. Cal.
T 7.18 6.96 1.87 1.59 0.26 0.23
L 7.29 7.16 2.46 1.94 0.33 0.27
1st T 2.10 2.45 1.39 1.33 0.66 0.54
Floor L 2.79 3.58 1.90 1.70 0.68 0.47
T 8.73 8.56 1.44 1.34 0.16 0.16
L 5.43 5.27 1.09 0.86 0.20 0.16
1st T 1.66 1.95 1.19 0.97 0.71 0.50
Floor L 1.43 2.05 0.93 0.76 0.65 0.37
Note: T: Trapsverse
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Wang, C.-Y. Mitigation of earthquake hazards using seismic isolation systems, article, June 1, 1996; Illinois. (digital.library.unt.edu/ark:/67531/metadc667864/m1/3/: accessed September 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.