Experimental Study on Anchoring Bond Behavior of Pre-Tensioned Prestressed Concrete Beams with Corroded Steel Strands

Li, Fu Min; Shi, Xiao; Jia, Fu Ping

doi:10.4028/www.scientific.net/amr.243-249.304

Cited by 3 publications

(9 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…More recently, the Polcevera Viaduct in Genoa, which was in service for over 50 years, collapsed, likely due to the combined effects of corrosion and fatigue [23][24][25]. Although scientific efforts are being devoted to the assessment of the residual structural performance of prestressed RC members damaged by corrosion [26][27][28], few experimental studies have been conducted to explore the flexural behavior of corroded pretensioned reinforced concrete (PRC) beams [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47]. The beams realized with the pretensioning technique, where the strands are adherent to the concrete, respond differently to the corrosion phenomenon with respect to the case of beams realized with the post-tensioning technique [38,48].…”

Section: Introductionmentioning

confidence: 99%

“…Although scientific efforts are being devoted to the assessment of the residual structural performance of prestressed RC members damaged by corrosion [26][27][28], few experimental studies have been conducted to explore the flexural behavior of corroded pretensioned reinforced concrete (PRC) beams [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47]. The beams realized with the pretensioning technique, where the strands are adherent to the concrete, respond differently to the corrosion phenomenon with respect to the case of beams realized with the post-tensioning technique [38,48]. In fact, once corrosion occurs, in pretensioning, the variation in bonds between strands and concrete influences the state of coaction, which does not occur in post-tensioning.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Residual Flexural Capacity of Corroded Prestressed Reinforced Concrete Beams

Kioumarsi

Benenato

Ferracuti

et al. 2021

Metals

View full text Add to dashboard Cite

Infrastructures and industrial buildings are commonly exposed to aggressive environments and damaged by corrosion. In prestressed reinforced concrete structures, the potential risks of corrosion could be severe since reinforcements are already subjected to high amounts of stress and, consequently, their load-bearing capacity could abruptly decrease. In recent years, some experimental studies have been conducted to explore the flexural behavior of corroded pretensioned reinforced concrete (PRC) beams, investigating several aspects of residual structural performance. Although many studies have been done in this area, there is no concise paper reviewing the state-of-the-art research. Accordingly, the main objective of this paper is to provide a review of the available experimental tests for residual capacity assessment of corroded PRC beams. Based on the state-of-the-art review, a degradation law for the flexural strength of corroded PRC beams is suggested.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Residual Flexural Capacity of Corroded Prestressed Reinforced Concrete Beams

Kioumarsi

Benenato

Ferracuti

et al. 2021

Metals

View full text Add to dashboard Cite

show abstract

“…Corrosion of embedded steel rebars has a tremendous impact on the long‐term performance of reinforced concrete (RC) structures, either prestressed or non‐prestressed, accelerating its deterioration and aging, and reducing its safety and expected service life . Optimal decision‐making about maintenance, repair, and operation of corroding RC structures must consider the structural deteriorating effects of corrosion, which are strongly dependent on the actual corrosion levels (measured in terms of rebar's cross section loss percentage) and on its spatial variability …”

Section: Introductionmentioning

confidence: 99%

“…Corrosion of embedded steel rebars has a tremendous impact on the long-term performance of reinforced concrete (RC) structures, either prestressed or non-prestressed, accelerating its deterioration and aging, and reducing its safety and expected service life. [1][2][3][4][5][6][7] Optimal decision-making about maintenance, repair, and operation of corroding RC structures must consider the structural deteriorating effects of corrosion, which are strongly dependent on the actual corrosion levels (measured in terms of rebar's cross section loss percentage) and on its spatial variability. [8][9][10][11] Several research works have been devoted to the topic of corrosion of RC structures, but only few have addressed reliable and versatile methods to assess the corrosion levels actually present, including their distribution along the reinforcing bars (RBs) length.…”

mentioning

confidence: 99%

A new method for corrosion assessment of reinforcing bars based on close‐range photogrammetry: Experimental validation

Cavaco

Pimenta

Valença

2019

Structural Concrete

View full text Add to dashboard Cite

In most developed countries, a significant portion of the nation's Gross Domestic Product (GDP) is spent on maintenance of reinforced concrete (RC) structures suffering from corrosion. Although extensive research has been devoted to this issue, little attention has been given to the study of accurate methods to quantify corrosion and its spatial variability. As a result, scattered data can be found in the literature, relating the rates of corrosion, its penetration depth, and the resulting structural deteriorating effects. In this paper, a new cost‐effective and versatile method for corrosion assessment of RC structures based on close‐range photogrammetry is proposed. This method was validated by applying it to an experimental research on an accelerated corrosion test of reinforcing bars (RBs). The tests performed show that the proposed method can provide accurate results independent of the RB diameter, length, and corrosion level (measured in terms of rebar's cross section loss percentage), as long as sufficient image overlapping is ensured along the axial and radial axes of the rebar. The results obtained also prove that the method is suitable to measure spatial variability of corrosion attack, providing much better results than those gained from existing geometrical models based on the maximum pit depth. More precise results can be achieved by using semi‐professional Digital Single‐Lens Reflex Cameras (DSLR) cameras having the additional advantage to be suitable for low levels of corrosion attack. However, the research performed shows that accurate results can also be obtained even when a less sophisticated or a smartphone camera is used.

show abstract

“…e loss of cross area and mechanical behavior of steel strands and the degradation of bond behavior between concrete and steel strands [4][5][6] will have a significant influence on the safety of prestressed concrete structures. 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.…”

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

View full text Add to dashboard Cite

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.

show abstract

Experimental Study on Anchoring Bond Behavior of Pre-Tensioned Prestressed Concrete Beams with Corroded Steel Strands

Cited by 3 publications

References 5 publications

Residual Flexural Capacity of Corroded Prestressed Reinforced Concrete Beams

Residual Flexural Capacity of Corroded Prestressed Reinforced Concrete Beams

A new method for corrosion assessment of reinforcing bars based on close‐range photogrammetry: Experimental validation

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

Contact Info

Product

Resources

About