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

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