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Stress assessment in reinforcement for columns with concrete creep and shrinkage through Brazilian technical normative

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Abstract

In this paper, the induced stress in longitudinal reinforcement bars with cross sections subjected to concrete creep and shrinkage was evaluated. The study was performed for a reinforced concrete column, with loading varying from zero—in which the structure is exclusively subjected to self-weight—to forces close to the loss of stability by bifurcation of equilibrium. A real precast concrete pole, extremely slender, with geometry varying lengthwise, was the structure chosen for the analysis. The aspects related to the material nonlinearity, as well as creep, shrinkage and the development of characteristic concrete strength, were taken into account following Brazilian normative recommendations in NBR 6118:2014 (Design of structural concrete—Procedure) by the Brazilian Association of Technical Standards (ABNT). The critical buckling load was defined according to the structural frequency by using particularly nonlinear formulations. The results were obtained for different instants without exceeding the expected time for convergence of results. The maximum relative value found for the reinforcement stress was 1.24% of the steel yield strength, eliminating the possibility of yielding material.

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Authors and Affiliations

  1. Department of Construction and Structures, Polytechnic School, Federal University of Bahia (UFBA), Rua Prof. Aristides Novís, Nº 02, 5º andar, Federação, Salvador, BA, CEP: 40210-630, Brazil

    Alexandre de Macêdo Wahrhaftig & Kaique Moreira Matos Magalhães

  2. Graduate Program in Civil Engineering (PPEC), Polytechnic School, Federal University of Bahia (UFBA), Rua Prof. Aristides Novís, Nº 02, 8º andar, Federação, Salvador, BA, CEP: 40210-630, Brazil

    Lázaro Sabas Marques Silva Cheles Nascimento

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  1. Alexandre de Macêdo Wahrhaftig
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  2. Kaique Moreira Matos Magalhães
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Correspondence to Alexandre de Macêdo Wahrhaftig.

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The authors declare that all the data, models and code generated or used during the study appear in the submitted article; that there is no conflict of interest to declare; and that there was no funding.

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Technical Editor: Andre T. Beck.

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de Macêdo Wahrhaftig, A., Magalhães, K.M.M. & Nascimento, L.S.M.S.C. Stress assessment in reinforcement for columns with concrete creep and shrinkage through Brazilian technical normative. J Braz. Soc. Mech. Sci. Eng. 43, 6 (2021). https://doi.org/10.1007/s40430-020-02731-6

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  • DOI: https://doi.org/10.1007/s40430-020-02731-6

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