Abstract
Usually, projects of torsion beams situations caused by marquees are made considering a prescriptive methodology, not considering the unsureness related to the problem. When such uncertainties are ignored, projects can be oversized or not satisfactorily safe. An option to overcome this problem is an application of reliability theory, which consists of quantifying structural safety using probability of failure. Thus, the probability of failure of a beam subjected to torsion caused by a marquee is estimated in this article. For this, the reliability methods FORM (First Order Reliability Method) and Monte Carlo are applied. The reliability analysis are evaluated considering the variation of the geometric dimensions and the properties of the materials involved. It is also done an analysis of the sensitivity indexes of the random variables that are part of the proposed problem limit state equation. The random variable of greatest contribution to failure was the specific weight of the concrete, with 60% of the composition of the probability of failure. The Fck, in turn, was the random variable that contributed the most to the reliability of the beam. The results demonstrate the importance of considering the uncertainties inherent in structural project of beams subjected to torsion.
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