Análise comparativa de métodos aproximados para cálculo do efeito local de segunda ordem em um pilar de concreto armado

Abstract

It is essential to consider second order efforts with a greater propensity to horizontal displacements in current buildings, with slender columns. For the consideration of the efforts, the study aimed to analyze these effects in an example column, through the presentation and relation of the calculation methods Standard column: stiffness "k" and approximate curvature, P Delta and application of the program P Calc. An example column was used to which the standard column methods obtained in NBR 6118(2014) were applied, later they were compared with the iterative method of fictitious loads P Delta, and finally, the P calc program will be used applying the standard column method coupled with M, N, 1/r diagrams for the consideration of the effects with the purpose of elaborating a table containing the combination of the diagrams. The results show the value of second order moments of the approximate stiffness "k" method only 0.81% higher than the process coupled to diagrams, together presenting the lowest moment values of the study, and a difference of 1.09% between the P Delta process and the approximate curvature system. The maximum difference between the moments was 7.7% showing the effectiveness of the results.