castellated beams, Litzka, numerical model, finite element method, structural reliability
Resumo
This paper presents a safety evaluation of Litzka castellated beams, based on calculation models proposed in the technical literature. It is noteworthy that there are currently no applicable Brazilian standards or official design criteria for this type of structure. The safety assessment is carried out through structural reliability analysis of the beams and advanced finite element-based analysis of their actual resistance. The effects of geometric imperfections and residual stresses on the resistance of the beams are considered. Statistical parameters related to model error, material strength, geometric properties, and permanent and variable loads are taken into account in the reliability evaluation. Reliability indices are obtained for load combinations according to Brazilian, American, and European standards. These indices reflect the safety level of the beams designed according to the analyzed models. The results are compared with target reliability indices recommended by ASCE and Eurocode.
