The earthquake record and the code for designing and constructing buildings in seismic regions in Bulgaria have shown that the country is exposed to a high seismic risk due to local shallow and regional strong intermediate-depth seismic sources and that the available strong-motion database is quite limited and therefore not at all representative of the real hazard. The problem of seismic microzonation is of crucial importance for Sofia due to rapid urbanization at the national level and to the significant growth of the city that has led to the construction of a large volume of new residential and high-rise administrative and business buildings. Sofia is exposed to a high seismic risk. Macroseismic intensities in the range of VIII–X (MSK) can be expected in the city. The earthquakes that influence the hazard in Sofia originate either beneath the city or are caused by seismic sources located in a radius of 40–300 km. The city is also affected by remote seismic zones located in Turkey, Greece and Romania. The built environment is particularly vulnerable to the long-period elements of the Vrancea seismic zone in Romania. The high seismic risk and the lack of instrument records of regional seismicity require the development of a viable seismic microzonation procedure that supplies seismic input consistent with current codes (norms) and considers local site geology in detail as well. In this study, the results of applying a seismic microzonation procedure for designing and constructing a 34-storey administrative building in Sofia are shown. Both regional (20–300 km zone) and far-distant seismicity (zone with radius larger than 300 km) were analyzed in order to define characteristic parameters for probable earthquake scenarios. Both deterministic and probabilistic seismic hazard estimates were made. On the basis of the analyses, accelerograms were generated considering one-dimensional linear models and making use of the geomechanical and geophysical characteristics of the soil at the construction site that were obtained by in situ ?measurements. Using the results obtained, seismic risk estimates and seismic monitoring prescriptions for the planned building are provided.
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Paskaleva, I., Simeonov, S., Koleva, N., Kouteva, M., Hadjiiski, K. (2008). An Assessment Of The Parameters Controlling Seismic Input For The Design And Construction Of A High-Rise Building: A Case Study For The City Of Sofia. In: Zaicenco, A., Craifaleanu, I., Paskaleva, I. (eds) Harmonization of Seismic Hazard in Vrancea Zone. NATO Science for Peace and Security Series C: Environmental Security. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-9242-8_12
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