Shock and Vibration

Shock and Vibration / 1998 / Article

Open Access

Volume 5 |Article ID 418528 |

Edward G. Fischer, Thomas P. Fischer, "Quasi-Resonance Effects Observed in The 1994 Northridge Earthquake, and Others", Shock and Vibration, vol. 5, Article ID 418528, 6 pages, 1998.

Quasi-Resonance Effects Observed in The 1994 Northridge Earthquake, and Others

Received18 Sep 1995
Revised26 Jun 1998


Sine-beat phenomena have been found in the 1994 Northridge earthquake records, and they are capable of producing time-history responses and damaging quasi-resonance effects in structures. Linear, single DOF (degree of freedom) oscillators, in lieu of nonlinear, multiple DOF systems, have been found adequate to discuss the failures of tall circuit breakers during the 1971 San Fernando and the 1989 Loma Prieta quakes in California. The use of sine-beat excitation for seismic-shaking-table tests of equipment continues to be a conservative simulation of earthquakes.

Copyright © 1998 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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