Open AccessEarthquake simulation testing of a stepping frame with energy-absorbing devices
Author(s) -
James M. Kelly,
D. F. Tsztoo
Publication year - 1977
Publication title -
bulletin of the new zealand society for earthquake engineering/nzsee quarterly bulletin
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.917
H-Index - 36
eISSN - 2324-1543
pISSN - 1174-9857
DOI - 10.5459/bnzsee.10.4.196-207
Subject(s) - structural engineering , earthquake shaking table , frame (networking) , foundation (evidence) , base isolation , ground motion , base (topology) , energy (signal processing) , computer science , geology , engineering , geotechnical engineering , mechanical engineering , physics , mathematics , mathematical analysis , archaeology , history , quantum mechanics
Results are reported of earthquake simulation tests on a model frame with a partial base isolation system that includes energy-absorbing devices. The isolation system was modeled on a stepping bridge concept developed for the New Zealand Railways, and the energy-absorbing devices, based on the plastic torsion of rectangular mild steel bars, functioned only when the frame base lifted off the foundation. Two series of tests using scaled accelerations from the El Centro N-S 1940 and Pacoima Dam 1971 earthquake ground motion records were used as input to the shaking table on which the tests were performed. Results from these tests are compared to those from earlier tests on an identical frame with the foundation (1) anchored as in conventional design, and (2) permitted to uplift freely. The response of
the frame with the energy-absorbing devices installed was improved over
that of both the fixed frame and the frame allowed to uplift freely for the El Centro accelerations. Although the results are not as favourable for the Pacoima Dam input, the feasibility of the energy-absorbing devices associated with a partial base isolation system is established as an alternative to anchored frames and frames allowed to uplift freely.