THE COMPARISON OF DEFORMATION CALCULATION RESULTS OF STRUCTURES UNDER SEISMIC IMPACT USING MOHR-COULOMB AND HARDENING SOIL SMALL (HSS) SOIL MODELS

This study examines the behavior of buildings under seismic impacts considering different soil models. Nowadays, along with the use of numerical methods in the analysis and design of engineering projects, it is known that this method is widely used in the analysis of problems related to geotechnical engineering construction. Comparative data on displacements, moments, and forces have been obtained for the Mohr-Coulomb soil model and the Hardening Soil Small (HSS) model. The software Plaxis 2D is used for the analysis of both models. The application of such complexes requires special attention to soil foundation models and parameter assignment. The selection of appropriate parameters and soil models can significantly influence the results of numerical analysis. The Mohr Coulomb elastic-plastic model is one of the most widely used models adopted in cases of hardness estimation of materials independent of surface tension. However, it was found that, the stress stiffness in the behaviour model and the difference in stiffness between initial loading and unloading/re-loading are important modelling aspects when discussing seismic effects and play an important role in predicting ground motions. A comprehensive comparison of the results for the Mohr-Coulomb and Hardening Soil models reveals several important differences, which are presented in this article.