Evaluation of the response of historical structures fitted with seismic-isolation

Bogdan Felix  Apostol; Stefan Florin Balan

doi:10.59400/be.v2i1.1226

Evaluation of the response of historical structures fitted with seismic-isolation

Bogdan Felix Apostol Department of Engineering Seismology, National Institute of R-D for Earth Physics, Magurele, 077125 Ilfov, Romania
Stefan Florin Balan Department of Engineering Seismology, National Institute of R-D for Earth Physics, Magurele, 077125 Ilfov, Romania

Ariticle ID: 1226

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DOI: https://doi.org/10.59400/be.v2i1.1226

Keywords: historical retrofitted buildings; seismic isolation performance; spectral parameters; Vrancea earthquakes; medium intensity seismic activity

Abstract

The paper highlights the performance of the seismic isolation devices, installed on retrofitted buildings in reducing the seismic response when subjected to earthquakes. Two buildings from the beginning of the XX-th century in Bucharest are chosen from many more, monitored over the city area. We discuss the response of these base-seismic isolated structures, relying on good quality data acquired from the recent strong earthquake (03 November 2022, M_W = 5.0). Elastic response spectra computed from recordings at two levels of each structure are used, placed under and right above the isolating layer. At one building the existence of previous recordings and the particularity of the sensors allow a comparison with other two relatively recent medium intensity earthquakes. The assessment is carried out in terms of maximum acceleration a_max, measured at certain levels in each structure, spectral acceleration amplitude SA_max and spectral-peak corresponding period. We find that the base-isolation methodology is effective in reducing the response of the building right above the isolating layer, an observation valid for both structures, all components of the recordings, and spectral acceleration values. Moreover, the outcomes from the modal evaluation performed prior to rehabilitation and seismic isolation process are presented, by pointing out a higher newly acquired fundamental period of the isolated structures.

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Published

2024-04-23

How to Cite

Apostol, B. F., & Balan, S. F. (2024). Evaluation of the response of historical structures fitted with seismic-isolation. Building Engineering, 2(1), 1226. https://doi.org/10.59400/be.v2i1.1226

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