Reliability of R.C. cross-sections designed for simple bending according to the 2014 and 2023 versions of NBR 6118 code
Abstract
This article presents a comparative study of the reliability of reinforced concrete (R.C.) cross-sections subjected to simple bending, designed at the ultimate limit state and following the recommendations of the 2014 and 2023 versions of the Brazilian code NBR 6118. The analyses are based on reliability theory by implementing the FORM algorithm on three rectangular cross-section configurations, considering fixed dimensionless bending moments and five different concrete strength classes between C30 and C90. Although the elements designed by NBR 6118:2023 have shown additions of up to 19% in steel consumption as a consequence of the implementation of the fragility coefficient (ηc), the results show no significant improvements in reliability compared to the 2014 version of NBR 6118.
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