SPECIFICS OF PERFORMING SEISMIC MICROZONING IN THE URBANIZED COASTAL AREA OF GELENDZHIK CITY FOR HIGH-RISE CONSTRUCTION
| Autor: | B. A. Trifonov, V. V. Sevost'yanov |
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| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Engineering survey. 12:82-90 |
| ISSN: | 2587-8255 1997-8650 |
| Popis: | The initial (background) seismicity of the territory of Gelendzhik with the high responsibility buildings projected for construction of (35-storey towers 123 meters high) is equal to 9 points according to the Map of General Seismicity of Russia (OSR-2015(B)) with the period of recurrence of tremors 1 time per 1000 years. The purpose of the study was to obtain the parameters of predictive seismic impacts for the site of the proposed construction taking into account regional seismotectonic and local seismic soil conditions. The influence of ground conditions on the on the seismicity of the research site was estimated when the bedrock in the Black Sea coast of the Caucasus, as a rule, lies not deep (several meters) from the surface and overlapping Quaternary sediments are flooded. Based on the result of vertical seismic profiling (VSP), a generalized geoseismic condition for the whole site was given. To determine the seismic intensity increment ΔI by the method of seismic rigidities comparison, the weighted average values of the S-waves velocities and the thickness of the soils up to the boundary of the reference soil were used in the calculations. Based on the obtained geoseismic model (results of engineering-geological and seismic studies), the NERA program calculated the parameters of seismic impacts from the most hazardous zones of origin of seismic foci (ASF) taking into account the initial seismic impacts in the territory of Gelendzhik and the results of seismic microzoning. It was found that the highest values of maximum accelerations at the studied site are caused by foci from the Mikhailovskaya and Gelendhizkskaya ASF zones; and the lower values are expected from outbreaks from the Tyapsinskaya and Akhtyrskaya ASF zones. To calculate the seismic load on the projected structures, it is proposed to use one set of synthesized accelerograms (X, Y, Z) simulating the impact from different PSF zones, which contain the entire set of vibration periods and cover the whole range of maximal velocities dangerous for the studied areas. The analysis obtained data shows good convergence of the seismic microzoning data obtained by the calculation method and seismic rigidity method. |
| Databáze: | OpenAIRE |
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