A large deformation of base isolation layer could be induced by the near-fault ground motions．Although the displacement-constraint devices can constraint the large displacements of the base isolation layer, impacts between the displacement-constraint devices and the superstructures of the base isolation layer may change the dynamic responses of the superstructures. 9sets of tests about base-isolated structures impacting on spring displacement-constraint devices are analyzed. The results indicate that the displacement-constraint devices can constraint the displacement of the base isolation layer well, but higher modes will be elicited and great velocity increments may be produced due to the impact. The story drifts and acceleration of superstructures will increase in the case of impact. The responses of superstructures may be reduced when the stiffness of the displacement-constraint devices and the gaps between the devices and structures are designed reasonably.
Key words
near-fault ground motion /
displacement constraint /
impact /
base-isolation /
shaking table test
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References
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Footnotes
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