Yegupov V. Investigation of seismic resistance of buildings and structures

The thesis deals with the calculation of buildings and structures of increased responsibility for seismic impacts. It is shown that not taking into account a number of geophysical factors leads to a significant change in the magnitude of seismic influences, often in a dangerous direction. To assess the reliability of the objects of the increased class of responsibility (CC2 and CC3), it is necessary to obtain additional geophysical data (wave propagation speed under the structure, the prevailing period of soil oscillation and synthesized accelerograms taking into account the ground conditions of the construction site). Theoretical modeling of seismic influences and numerical experiments made it possible to establish that the unevenness of the soil oscillation field, the seismic wave filtration by the geological medium, and the appearance of resonance oscillations in structures with strong subcrustal earthquakes in the Vrancea zone may increase seismic loads by several times. The calculated accelerograms and reaction spectra based on the results of the SMR make it possible to significantly reduce the cost of this earth-resistant construction due to the optimal choice of design solutions that avoid the coincidence of the prevailing frequencies corresponding to peak accelerations in seismic waves, the resonant frequencies of the underlying soil strata and the natural frequencies of the designed building ), with the preservation of the necessary reliability of highly responsible structures. Key words: class of consequences (responsibility), earthquake, seismic microzoning, calculated accelerograms, buildings, structures