Abstract:Mi más sincero reconocimiento y gratitud se dirige, en primer lugar, a los Directores de esta tesis, Dr. Carmen Andrade Perdrix y Dr. Jesús Rodríguez Santiago, cuya experiencia, consejo y dedicación han permitido que este trabajo llegue a buen término. A Carmen Andrade querría agradecerle no sólo compartir conmigo una pequeña parte de sus vastos conocimientos en el campo de la corrosión de armaduras, sino especialmente, transmitirme su pasión por la investigación. A Jesús Rodríguez le debo su constante apoyo d… Show more
“…The model variables were calibrated from the results of pull‐out tests on nonstressed wires, and its theoretical results were verified by comparing them with the data extracted from an experimental campaign on prestressed beams. Further details can be found in Anaya 31 and Anaya et al 32 …”
Section: Methodsmentioning
confidence: 99%
“…The model variables were calibrated from the results of pull-out tests on nonstressed wires, and its theoretical results were verified by comparing them with the data extracted from an experimental campaign on prestressed beams. Further details can be found in Anaya 31 and Anaya et al 32 The methodology followed in this research, which has both a theoretical and an experimental component and consists of several distinct stages, has been shown as an efficient procedure to identify, analyze, and measure the main geometric and mechanical variables involved in the phenomenon of corrosion in prestressed elements. The stages in which this work has evolved follow:…”
Bond is an essential property that guarantees the composite action in prestressed concrete (PC) members. This bond may be degraded due to different reasons, corrosion‐induced damage being one of the most frequent ones. The transfer length is the key indicator that describes the bond properties between prestressing steel and concrete. The analysis and design of PC members with prestressing wires require a realistic assessment of the bond transfer length. This paper presents an analytical study of the influence of the governing geometrical and mechanical variables on bond behavior in PC members undergoing steel corrosion. A model describing the deterioration of the transfer length due to corrosion, calibrated and verified through experimental tests, is proposed along with simplified expressions for the assessment of transfer lengths in PC members with corroded wires.
“…The model variables were calibrated from the results of pull‐out tests on nonstressed wires, and its theoretical results were verified by comparing them with the data extracted from an experimental campaign on prestressed beams. Further details can be found in Anaya 31 and Anaya et al 32 …”
Section: Methodsmentioning
confidence: 99%
“…The model variables were calibrated from the results of pull-out tests on nonstressed wires, and its theoretical results were verified by comparing them with the data extracted from an experimental campaign on prestressed beams. Further details can be found in Anaya 31 and Anaya et al 32 The methodology followed in this research, which has both a theoretical and an experimental component and consists of several distinct stages, has been shown as an efficient procedure to identify, analyze, and measure the main geometric and mechanical variables involved in the phenomenon of corrosion in prestressed elements. The stages in which this work has evolved follow:…”
Bond is an essential property that guarantees the composite action in prestressed concrete (PC) members. This bond may be degraded due to different reasons, corrosion‐induced damage being one of the most frequent ones. The transfer length is the key indicator that describes the bond properties between prestressing steel and concrete. The analysis and design of PC members with prestressing wires require a realistic assessment of the bond transfer length. This paper presents an analytical study of the influence of the governing geometrical and mechanical variables on bond behavior in PC members undergoing steel corrosion. A model describing the deterioration of the transfer length due to corrosion, calibrated and verified through experimental tests, is proposed along with simplified expressions for the assessment of transfer lengths in PC members with corroded wires.
Since catastrophic failures caused by corrosion deterioration have been observed worldwide, nowadays a key research topic consists in the reliable prediction of the long‐term performance of corroded reinforced concrete structures. In this article, firstly, a refined model for the assessment of the residual service life of prestressed concrete (PC) beams has been presented. The analytical model, according to the most recent formulations proposed in the scientific literature, allows to take into account the effects induced by corrosion over time in the calculation of bending, shear, and anchorage resistances. Secondly, a case study concerning a PC beam without transversal reinforcement, exposed to wet‐dry cycles using seawater, has been presented considering the spatial variability of corrosion. To this aim, a constant and a varying spatial distribution of corrosion have been assumed. Finally, the residual service life values, evaluated according to the two assumed spatial distributions of corrosion in strands, have been compared. The proposed model can be used for the prediction of the possible failure modes of PC beams over time, considering both the reduction of the mechanical properties of the prestressing steel and the bond degradation due to corrosion deterioration according to recent experimental evidence.
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