Published in Scientific Papers. Series E. Land Reclamation, Earth Observation & Surveying, Environmental Engineering, Vol. II
Written by Claudiu-Sorin DRAGOMIR, Andreea DUTU, Ioan-Sorin BORCIA
At present, earthquake engineering can take advantage, among others, of the modern consolidated technique, namely “seismic base isolation”. Base isolation is a technique that is easily enforceable in the case of buildings or other structures of new building, but it can also be used for the ”strengthening” of already existing buildings. This technique has been often used with success, first in New Zeeland and USA, and now also in Italy, Japan, and other countries. The main objective of paper is to analyze the dynamic response of base isolation system under specific localseismic conditions. Local seismic conditions were established on the base of Vrancea earthquake records obtained during strong Vrancea earthquakes in 1977, 1986 and 1990. As results of this analysis at the end of paper are presented pros and cons for applying the strengthening methods to buildings located in Bucharest. The most important aspect is that high amplifications are present in response spectra of relative displacements at long periods. For this seismic local condition are very difficult to design an effective base isolation system.
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response spectra
