Scholarly record

SEISMIC MONITORING OF STRUCTURES SUBJECTED TO MEDIUM INTENSITY EARTHQUAKES

Ştefan Florin Bălan

Abstract

The paper presents accelerations, response spectra and spectral ratio for two tower-type buildings, one in Southern part of Bucharest, T1, at ~160 km from the epicenter zone, and other, T2, near the epicenter zone, Vrancea. These seismic characteristics are all from recorded earthquakes triggered in the above mentioned area. 3 triaxial seismic accelerometers were used on 3 levels at each building. The accelerations recorded on the analyzed structures were a result of Vrancea medium magnitude earthquakes between 2014-2017 years, with magnitudes Mw ranging from 3.8 to 5.6, and focal depths between about 40 km to 148 km. An analysis of structural response was made concerning each building, T1 on 12 seismic events and T2 on 6 ones, and with 4 common seismic events for both structures. Maximum accelerations at three buildings levels and acceleration response spectra at the basement of buildings are calculated for two strongest earthquakes, and spectral ratio (top/base) for three, respectively two strongest seisms. The recorded data and subsequent analysis will contribute to a better understanding of the structures responses, even subjected to medium magnitude seismic events, and to the mitigation of seismic risk for densely populated areas.

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