STRESS-STRAIN STATE FINITE ELEMENT MODEL OF PILE-FOUNDATION BRICK BUILDING VERTICAL EXTENSION

Relevance: Numerical simulation is provided for the stress-strain state of a pile-foundation brick building with the additional structure. The simulation is performed with MicroFe computer system which creates a model of the base – foundation – superstructure system. In this model, finite elements represent the piles. Purpose: The aim of the paper is to perform the finite element analysis of the base – foundation – superstructure system deformation and compare the theoretical and experimental results. Methodology/approach: Two approaches to the numerical simulation are used: 1) rigid foundation and 2) pliable foundation due to the pile displacement. Findings: The bay analysis based on the first approach shows that the stress values exceed the theoretical in some of the structures. The bay analysis based on the second approach shows that the reinforcement deficit amounts to less than 1 % as compared to the theoretical calculations. The obtained results on the estimated and actual displacement at the wall pedestal part show a 15 % difference. During constructing the additional structure, the calculated values of the stress achieve the maximum and exceed design values. With account of the piled foundation, the stress reduction is obtained in engineering structures. Results: The finite element model is designed for the base – foundation – superstructure system. As a result of comparison of theoretical and experimental results, the main parameters of the absolute and relative vertical pile displacement do not exceed the allowable values determined by the national standards.

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