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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:41 |
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Conference: Bucharest University Faculty of Physics 2018 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Analysis of accelerometric data recorded on IFA building and free-field during recent moderate earthquakes
Authors:
Alexandru TIGANESCU(1), Carmen Ortanza CIOFLAN(1), Gheorghe MARMUREANU(1), Stefan Florin BALAN(1)
Affiliation:
1) National Institute for Earth Physics
E-mail
alexandru.tiganescu@infp.ro
Keywords:
structural monitoring, Magurele area, response spectra, Vrancea earthquakes
Abstract:
All the buildings from Bucharest area are exposed to high seismic hazard. The last two major earthquakes occurred in 1940 (Mw = 7,7) and 1977 (Mw = 7,4) and have had large socio-economic impact on our society. In the perspective of a future strong event, a very useful tool is to track and evaluate the response of buildings subjected to earthquakes. The National Institute for Earth Physics is monitoring six instrumented buildings and the data is transmitted in real-time to the National Data Center. This paper aims to analyze the accelerometric data recorded on one of these instrumented buildings, IFA (Institute of Atomic Physics), and free-field data from Magurele seismic station. The monitoring process, for the building, started in 2013 and the instrumentation consists of three “Triaxial Seismic Accelerometers” installed at the basement, 6th floor and 10th floor. Six recent earthquakes with moment magnitudes ranging from 4.5 to 5.6 and a large variety of depths were selected for the analysis. The corrected acceleration time-histories and response spectra were computed and discussed. An amplification of the accelerations with height is observed on the building, as expected, and the shape of the response spectra for the stations located in free-field and at the basement is similar, but the acceleration values are different. For a broader perspective, the free-field response spectra from moderate recent earthquakes were compared to the ones in 1986 and 1990, at the same location. This study will contribute to a better understanding of the structural response of IFA building during an earthquake and to mitigation of seismic risk for Magurele area.
Acknowledgement:
This paper was carried out within Nucleu Program 2018, supported by Ministry of Research and Innovation, project numbers: PN PN18150101.
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