Experimental evaluation of the flexural behavior of corroded P/C beams

Rinaldi, Zila; Imperatore, Stefania; Valente, C.

doi:10.1016/j.conbuildmat.2010.04.029

Cited by 96 publications

(45 citation statements)

References 8 publications

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“…One of the main and direct consequences of the corrosion process is the reduction of the steel cross‐section—uniform or localized on the entire reinforcement length—and a worsening of the reinforcing steel strength in tension and ductility properties . Consequently, a reduction of the bearing and dissipative capacity of the structural element may occur …”

Section: Influence Of the Corrosion On The Tensile Behaviour Of Steelmentioning

confidence: 99%

Experimental investigations on the effects of the steel rebar corrosion at structural level

Imperatore

Rinaldi

Spagnuolo

2019

Structural Concrete

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The paper presents some of the results obtained in the framework of a wide research program funded by the Italian Ministry of Instruction and Research, on the corrosion effects on existing structures. Both the aspects related to ultimate and serviceability states are analyzed. In particular, in the first case, the study is devoted to the definition of constitutive relationships of the steel rebars subjected to the corrosion. Many studies are available in literature on this topic, mainly with reference to the tensile behavior; the compressive one is generally neglected. The compressive and buckling behavior of corroded steel bar is discussed in this article with reference to experimental test results, and the importance of accounting for this peculiar aspect is motivated. Finally, with reference to serviceability states and based on tensile tests on reinforced concrete ties, the influence of corrosion on bond transfer length and crack pattern, due to low corrosion amount, not affecting the local and global strength, is clearly shown.

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Section: Influence Of the Corrosion On The Tensile Behaviour Of Steelmentioning

confidence: 99%

Experimental investigations on the effects of the steel rebar corrosion at structural level

Imperatore

Rinaldi

Spagnuolo

2019

Structural Concrete

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“…Li and Yuan [7] believed that the effect of slight corrosion rates (less than 2.87%) is not significant to the flexural capacity, but will lead to the remarkable degradation of ultimate deflection for the beams with wire rupture failure. e tests of Rinaldi et al [8] and Zhang et al [9] show that the ultimate capacity of PC beams decreases with the increase of corrosion degree and turns the failure mode from ductile to brittle. An analysis model is proposed by Wang et al [5] to predict the failure and flexural strength of PC beams under chloride corrosion condition.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Flexural Behavior of Prestressed Concrete Beams Reinforced by CFRP under Chloride Environment

Liu

Fan

2019

Advances in Civil Engineering

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In order to study the effects of initial damages, CFRP reinforcement, and chloride corrosion on the flexural behavior of prestressed concrete beams, ten prestressed concrete beams were designed and manufactured, which were preloaded with 0%, 40%, and 60% of the ultimate load to crack. Then, part of the beams were reinforced by CFRP and immersed in chloride condition for 120 days. After that, the four-point bending tests were performed. Then, the sectional strain, deformation, flexural stiffness, flexural capacity, ductility, and the cracking characteristics were researched. The test results demonstrate that the sectional strain of PC beams still follows the plane cross section assumption after a pure bending deformation considering of the initial cracks, chloride corrosion, and CFRP reinforcement. The initial damage accelerates the chloride corrosion, resulting in the loss of initial stiffness, ductility, and cracking load, and the reduction in flexural capacity is less than 10%, and the failure modes of these beams are prone to change from concrete crushing to shear failure. In the cracking stage, the reinforcement of CFRP inhibits the bending deformation, leading to the reduction in stiffness degradation rates and the increase of cracking load, and the ultimate load increases by 12.8%∼18.7%. The reinforcement of CFRP constrains the development of cracks, increases the cracks numbers by 50%∼130%, decreases the cracking rates of beam bottoms by 52.5%, and reduces the average crack widths by 65.8% at 195 kN. It can be seen that the reinforcing effect of CFRP is more significant compared with the weakening effect of short-term chloride corrosion and initial damage on the flexural behavior.

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“…Corroded strands are usually characterized by a reduction in wire cross section and loss of strength and ductility. [4][5][6] Furthermore, PC structure can experience the stress corrosion cracking (SCC) related to the state of stress in the wires [7][8][9][10] and often associated to hydrogen embrittlement. 4,[11][12][13][14] Considering concrete-to-steel interface behavior, corrosion leads cracking and/or spalling of the concrete cover, 15 which cause bond strength reduction and anchorage failure likelihood.…”

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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Experimental evaluation of the flexural behavior of corroded P/C beams

Cited by 96 publications

References 8 publications

Experimental investigations on the effects of the steel rebar corrosion at structural level

Experimental investigations on the effects of the steel rebar corrosion at structural level

Experimental Study on Flexural Behavior of Prestressed Concrete Beams Reinforced by CFRP under Chloride Environment

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

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