Comparative numerical analysis between integral and conventional reinforced concrete bridges subjected to indirect effect of temperature
DOI:
https://doi.org/10.5216/reec.v21i1.77221Keywords:
Thermal effect, Integral bridges, Temperature variationAbstract
ABSTRACT: This article presents a comparative analysis between the structural behavior of integral, semi-integral abutment and conventional bridges to verify the variation of bending moments resulting from the indirect action of a thermal gradient. For this, a numerical analysis was performed using the finite element method (FEM), considering the three different structural systems mentioned. Moreover, soil deformability was considered through soil-structure interaction (SSI), using p-y curves, in which the soil adjacent to the foundations was represented by a set of horizontal springs, with non-linear behavior, and, in the case of landfill soil adjacent to the abutment, by linear springs. Then, a comparison was made between the results obtained through the different structural systems, as well as the comparison of the results obtained through the FEM, with the analytical models. The results showed that, for integral bridges and semi-integral abutment bridges, the effects of the thermal gradient caused significant increases in internal forces, representing an unfavorable effect that must be considered on the design of these structural systems. Additionally, for the conventional bridges, the effects of the gradient provoked negative moments in the isostatic spans, characterizing a favorable behavior, however inferior when compared to the effects on integral systems.
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