Akademik Veri Yönetim Sistemi
12th International İstanbul Scientific Research Congress on Life, Engineering, an Applied Sciences, İstanbul, Türkiye, 21 - 23 Ocak 2023, ss.111-116
İzmir
is located in a seismically active tectonic zone. After the major M6,6
earthquake occured in October 30, 2020, it is clearly realized that buildings
should be investigated very carefully. In this study, microtremor measurements
have been used to determine various building’s period and strength
characteristics, as a non-destructive way of exploring bearing frame structure
of the buildings. It is possible to measure dominant periods and amplifications
at each floor, and also to calculate floor spectral ratios (FSR). Microtremor
data were collected at each floor of 5 buildings in Karşıyaka, in the North of
İzmir Bay. The buildings were selected along the shoreline and the construction
ages as well as the heights were chosen to be similar, in order to make a
consistent comparison between the results. The data were recorded at each floor
of the buildings and outside the buildings simultaneously for 60 minutes and
HVSR curves were obtained by using GEOPSY software. The validation of periods
were determined using FSR in order to calculate damping ratios accurately. The
variation range and tendency between damping ratio and period of each floor with
damping ratios and vulnerability indices, along with the preliminary influence
factor, were presented and discussed. In addition, a fitting curve was plotted
indicating the relation between the damping ratio and dominant natural
frequencies of the floors of each building. Furthermore, evaluation of
strength, natural dominant vibration period and vulnerability index of the
buildings were estimated by interpreting microtremor data. As a result, it was
determined that 3 of the 5 buildings were seismically risky.