A Model for the Analysis of Ultimate Capacity of RC and PC Corroded Beams

Transverse reinforcement plays a key role in the response behavior of reinforced concrete beams. Therefore, corrosion of steel stirrups may change the failure mode of elements from bending to shear, leading to a brittle and catastrophic crisis. It is important to strengthen reinforced concrete beams with corroded stirrups to enhance the shear resistance. This paper presents a formulation, based on the modified compression field theory, to estimate the ultimate shear of reinforced concrete beams strengthened with FRP, because of stirrup corrosion. The detrimental effect of corrosion on steel stirrup yield strength was taken into account by introducing an empirical decay law. The effective strain of FRP reinforcement was adequately evaluated by considering both debonding and tensile stress rupture. The proposed model was validated against collected experimental results, showing a good ability to evaluate shear strength. Moreover, a numerical analysis was carried out to highlight the role of the key parameters predicting the ultimate shear.

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“…The step value of θ was calculated by Equation (11). Then the ultimate shear was obtained by Equation (9).…”

Section: Iterative Proceduresmentioning

confidence: 99%

“…In the literature, several models have alternatively been proposed to evaluate the shear strength of RC beams with corroded stirrups [11][12][13][14] or reinforced with composites [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Ultimate Shear of RC Beams with Corroded Stirrups and Strengthened with FRP

et al. 2019

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“…Finally, no data are available in literature concerning the study of corroded prestressed beams without transversal reinforcement, with the exception of papers published by authors. 27 In the past years, different authors proposed numerical and analytical approaches for the evaluation of the residual capacity of corroded beams ( 28,29 among few others). Generally, these models are usually tested on artificially corroded prestressed beams and hypothesize degraded properties evenly distributed.…”

Section: Introductionmentioning

confidence: 99%

“…In the past years, different authors proposed numerical and analytical approaches for the evaluation of the residual capacity of corroded beams ( 28–29 – among few others). Generally, these models are usually tested on artificially corroded prestressed beams and hypothesize degraded properties evenly distributed.…”

Section: Introductionmentioning

confidence: 99%

Numerical evaluation of the corrosion effects in prestressed concrete beams without shear reinforcement

Belletti

Vecchi

Bandini

et al. 2020

Structural Concrete

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Corrosion of prestressed concrete structures causes size reduction of strands, degradation of mechanical properties of steel, cracking of the surrounding concrete, and bond decay at steel-to-concrete interface. In this paper, a numerical approach able to take into account all the effects involved in the corrosion process by using nonlinear finite element analysis (NLFEA) and membrane or shell elements modeling is proposed. Two different strategies are adopted to model strands: the smeared and the discrete approaches. The results obtained using these latter strategies are validated by comparing NLFEA results with experimental measurements of a naturally corroded prestressed beam tested at the "Instituto de Ciencias de la Construcción Eduardo Torroja" in Madrid. Finally, pros and cons of the proposed modeling approach are critically analyzed, demonstrating that considering the actual spatial corrosion distribution is necessary to predict the position where failure occurs.

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“…Therefore, research on the influence of steel corrosion on the global behavior of concrete structures has been both intensive and extensive in the past few decades [2,3]. However, studies have focused more on reinforced concrete (RC) structures than on prestressed concrete (PC) structures, even though PC structures have been used in many constructions and are increasingly being used in new constructions that are particularly vulnerable to steel corrosion [4].…”

Section: Introductionmentioning

confidence: 99%

Resistencia a flexion de vigas postensadas de hormigón con corrosión. Ensayos a gran escala y simulación numérica.

Recupero

Spinella²,

Bernat³

et al. 2020

hya

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An experimental campaign on corroded post-tensioned concrete beams is being carried out at the University of Messina (Italy). The main goal of the research project is to study the influence of the tendon corrosion on the response behaviour of post-tensioned concrete beams subjected to a transversal load. In 2006, six beams were cast with a tendon placed at the centroid of the cross-section. Corrosion of the tendons was artificially induced in each specimen by injecting a chemical solution or an acid in some parts of the duct. The experimental results have showed how external causes, reproduced by artificial defects, can induce several critical issues, and undermine both the durability and the load bearing capacity of the beams. The load bearing capacity of the beam with defects was reduced until half of the one recorded for the specimen with not corroded tendon. In addition, a non-linear and time dependent analysis model, developed at UPC in Barcelona, was used to simulate the response of the tested beams, with the purpose of experimentally verifying the capacity of the model to capture the effects of corrosion along the time. A parametric study was performed with the numerical model to capture the influence of the degree of corrosion, (defined as the % loss of steel mass) on the serviceability response and on the ultimate capacity. By comparing the theoretical and the experimental results, the degree of corrosion was estimated and compared with that observed subsequently on the tested beams. Good correlation was obtained, thus allowing the numerical model to be used as a “virtual lab” to study the influence of several parameters on the structural response of corroded post-tensioned beams.

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A Model for the Analysis of Ultimate Capacity of RC and PC Corroded Beams

Cited by 12 publications

References 27 publications

Ultimate Shear of RC Beams with Corroded Stirrups and Strengthened with FRP

Ultimate Shear of RC Beams with Corroded Stirrups and Strengthened with FRP

Numerical evaluation of the corrosion effects in prestressed concrete beams without shear reinforcement

Resistencia a flexion de vigas postensadas de hormigón con corrosión. Ensayos a gran escala y simulación numérica.

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