Análise das manifestações patológicas da ponte sobre o rio Pedra no município de Delmiro Gouveia – AL: estudo de caso

Abstract

In structures of special reinforced concrete works of art (eg bridges and viaducts) the periodic assessment of pathologies is of great importance given the need to maintain a level of structural safety in accordance with current regulations, thus avoiding ruin and increasing protection against life as well as heritage conservation. However, in Brazil, it is not common to perform periodic maintenance on the bridges, consequently, the manifestations are frequently observed. In Alagoas, currently several structures do not fit within the standards required by standards, offering potential risks to their users and the environment. Therefore, the present work analyzes visually and by means of in loco tests the pathologies present in some of the structural components of the bridge over the Pedra River of Delmiro Gouveia - AL, based on the current norms: NBR 6118 (2014), NBR 7584 (2012), NBR 14178 (2001), NBR 15575 (2013), Standard DNIT / 090 (2006), Standard DNIT / 122 (2009), Road Inspection Manual DNIT / 709 (2004) and LNEC E391 (2019) . Based on the results of the analysis, it is noted that the structure contains several places where there is the compromise of the reinforcement due to oxidation, as well as carbonation, openings, efflorescence attack foci, infiltration, clogging of the drainage system, among others. Through the sclerometry test it was possible to verify that there was a reduction of about 23.3% of the resistance between the more and less resistant columns, as well as 16.19% resistance differences between faces of the same pillar. With current construction methods in the field of civil engineering, an analyzed bridge comprises a state concerned with structural stability or the use of deeper studies in which it is possible to draw up corrective and periodic maintenance plans in order to ensure safety in use and structurally revitalize the work.