Simplified global geometric and physical nonlinear analysis of reinforced concrete columns considering haunch variation and regular cross-sections

Abstract

The main objective of this work aims to present computational results related to the global nonlinear geometric and simplified physical analysis of reinforced concrete columns with haunch variation and rectangular cross-sections, considering the buckling in relation to the axis of greater inertia, through the use of an algorithm capable of using Simpson's Rule to obtain the equivalent stiffness of the element and to perform the iterative process P-Δ for the determination of slender column design demands. It is worth mentioning that these demands serve as a key element for the realization of a safe and cost-effective design of the structures. In order to validate the results obtained, the values of the 2nd order bending moments were compared with the answers determined from the column stability criterion (Gamma z coefficient) recommended by ABNT NBR 6118:2023. The methodology used provided consistent and more conservative results than the simplified method recommended by the Brazilian standard.