Soil-structure interaction of a building with a foundation slab with the dynamic models of Barkan and Savinov, Russian Standard SNIP 2.02.05-87 and Gazetas and Mylonakis

Abstract

The analysis of the Soil-Structure Dynamic Interaction in the seismic response of buildings has been the subject of study in multiple investigations, highlighting its relevance in structural safety, especially in contexts of high seismicity such as Peru. Studies carried out by Villarreal (2023), Braña, Gamón, Fundora and Martínez (2022) indicate that the structural behavior of buildings can be modified by considering the soil-structure interaction in the structural analysis and modeling of buildings. By incorporating the dynamic coefficients obtained with the elastic properties of the soil stratum, it is feasible to determine if there is any significant variation in the structural behavior of the model, in this sense the present study proposes as a research objective: to determine if the incorporation of the dynamic models of soil structure interaction of Barkan & Savinov, Russian Standard SNIP 2.02.05-87 and Gazetas & Mylonakis established in the NIST GCR 12-917-21 standard, can significantly modify or influence the structural behavior of the building to be considered within the structural analysis and later in the Peruvian standard E030. The building considered for the analysis has a structural system by shear absorbent walls (high rigidity), and the foundation is uniform by means of a foundation slab of e=0.40 cm. Through the study of soil mechanics, the properties of the soil were determined, categorizing the soil as S3, with an elasticity modulus Es=1150 ton/m2 and a Poisson coefficient μ=0.30, the height of the stratum at the foundation level is 1.20 m. The building is located in a peak acceleration zone of 0.25g. Through the analysis of the results, it was demonstrated that the structure having high rigidity does not significantly modify its period, being the greatest variation of the period of 1.60% for the Barkan & Savinov model, followed by the Gazetas & Mylonakis model with 1.42%. Concerning the drifts, a significant increase was observed in the level in contact with the foundation, with an average variation of 16.56% in the most flexible XX' direction of the building, while in the most rigid direction the increase was 10.50%. The results of the drifts were verified through a time history analysis, considering the Lima Earthquake of October 1966 and its two components (EW-NS), verifying that for the EW case the increase in the drift was 16.82%, while for the NS case an increase of 16.81% was obtained, both in the XX' direction. These results led to the conclusion that there was a significant increase in lateral deformations at the level in contact with the foundation slab, while the variation in the fundamental period and shear stresses were not significant, largely due to the structural system of shear-absorbing walls, which have a higher rigidity than other construction systems.