Análise da verificação de peças submetidas à compressão e flexo-compressão de acordo com as normas NBR 7190:1997 e NBR 7190:2022

Abstract

Wood is widely used in civil construction, and as a structural material, it must be analyzed to ensure user safety. The verification of wooden components is standardized by NBR 7190 Wood Structures Design Code, which, after more than two decades without updates, was revised and introduced a new way of analyzing components subjected to compression and combined bending and compression. This study analyzed the differences between the two versions of the standard, NBR 7190 (ABNT, 1997) and NBR 7190-1 (ABNT, 2022), for sawn woods of the dicotyledonous class. The method aimed to establish a section and loading for each case: simple compression and combined bending and compression, varying the bar length. Calculations and graphs were performed using Microsoft Excel software. The results show that the change in verification criteria impacted the acceptance coefficients, allowing for a continuous curve without discontinuities. The adjustment in the modulus of elasticity made the 2022 standard more stringent, and the removal of k_mod3 altered the beginning of the curve for small slenderness ratios. Furthermore, it was found that the 2022 standard no longer classifies bars according to slenderness ratio, simplifying the design process for compressed and combined bending and compression pieces and imposing stricter verification checks. Therefore, the NBR 7190-1 (ABNT, 2022) standard offers a more efficient and less complex process that facilitates its application.