ENGINEERING METHOD FOR DETERMINING THERMAL STRESSES DURING CONSTRUCTION OF FOUNDATION SLABS CONSIDERING FOUNDATION SOIL COMPLIANCE

Vasilina Sergeevna Tyurina, Anton Sergeevich Chepurnenko, Vladimir Feliksovich Akopyan

Abstract


Introduction. Massive monolithic foundation slabs are prone to early-age cracking caused by the exothermic heat of hydration of concrete. Selecting optimal strategies to address this issue can be achieved through computer-based simulations. Purpose of the study. The study is aimed at developing a simplified finite element model to determine the stress–strain state of foundation slabs during construction while accounting for foundation soil compliance, and validating this model against existing experimental data as well as results reported by other authors. In the course of the study, the following methods were used: finite element modeling with plate finite elements in the MATLAB environment, employing software developed by the authors that reduces the three-dimensional problem of determining the stress–strain state to a two-dimensional formulation. The foundation bed was modeled using the Pasternak model with two foundation moduli. The results show that the proposed solution is in good agreement with the numerical modeling data obtained by other researchers in a three-dimensional setting. Satisfactory agreement with the experimental results was also achieved. A study was conducted to assess the influence of the reinforcement ratio and the coefficient of linear thermal expansion of concrete on the stress–strain state.

Keywords


massive reinforced concrete structures; foundation slab; cracking; thermal stresses; finite element method; foundation modulus

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References


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ISSN: 2500-0055