Influence of Thermo-Mechanical Properties on Pre-Stressed Beams Subjected to Temperature Cycles
DOI:
https://doi.org/10.70567/mc.v41i5.29Keywords:
Uncertainty, Thermo-Mechanical Properties, Parametric Study, Thermal CyclesAbstract
Prestressed concrete beams are extensively used in the construction industry and may be exposed to extreme loads, such as those caused by building fires. Concrete is a material that evolves over time, particularly when exposed to high temperatures; it is sensitive to the highest temperature reached an nowadays the importance of the descending phase is recognized. This work employs the finite element method to model load histories using transient thermo-mechanical analysis. The objective is to capture, through a parametric probabilistic approach, the structural effects of uncertainties in the thermal and mechanical properties of prestressed beams subjected to thermal cycles. The descending branch is analyzed at various rates, and the mechanical response is evaluated. The maximum entropy principle is used to derive the probability density functions for the random parameters.
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