Analysis of earthquake resistance of civil buildings during the formation of a thawing bowl in permafrost soils

Introduction. The construction of civil buildings in permafrost areas is accompanied by risks associated with the formation of a thawing bowl at the base. Materials and methods. Numerical modeling of the "building – foundation – base" system under seismic impacts of various frequency compositions has been performed. Aim. Assessment of the impact of the thawing bowl on the earthquake resistance of civil buildings with various structural systems, taking into account seismic impacts of various frequency compositions. Results. It has been established that the presence of a thawing bowl changes the dynamic behavior of a building depending on its structural system and the frequency characteristics of an earthquake. The most pronounced increase in horizontal displacements is observed for medium–rigid and flexible structural systems in the low- and medium-frequency range, while rigid frameless systems maintain a more stable behavior. Conclusions. The results show that when calculating seismic impacts in permafrost conditions, it is necessary to consider the integral system "building–foundation–base". Taking into account the joint work of the structure and the thawing ground allows for a more accurate assessment of the seismic response of buildings with various structural systems.