Análise linear de estruturas de concreto armado com redistribuição de esforços

Abstract

Structural analysis is one of the most important phases in the design of buildings, as it provides the planned stresses and deformations for the structure, allowing the checks on the ultimate and service limit states in NBR 6118: 2014. In order to study the types of structural analysis in reinforced concrete structures, NBR 6118: 2014 considers the application of linear analysis and redistribution of effort, which allows the redistribution of effort according to the characteristic of each element. This redistribution is limited to the redistribution coefficients and the relative position of the neutral line, which can be controlled by the choice of the reinforcements of the cross sections of the elements analyzed. In this work it is shown how to carry out the analysis without and with redistribution of efforts for the structural elements, using software of analysis and structural dimensioning for the accomplishment of the analyzes. From the results obtained for the two analysis models it was concluded that after applying the redistribution coefficient chosen, the positive bending moments increased, however, there was no significant increase of the calculated armature in relation to the dimensionlessness without redistribution. The negative bending moments, when compared to the analysis without and with redistribution of efforts, reached the redistribution of the desired effort, that is to say, there was redistribution and therefore reduction in the area of steel calculated in the supports, which directly influences the value of steel consumption.