Equivalent material model of corroded prestressing steel strand

Jeon, Chi-Ho; Jae-Bin, Lee; Lon, Sokanya; Shim, Chang-Su

doi:10.1016/j.jmrt.2019.02.010

Cited by 76 publications

(62 citation statements)

References 7 publications

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“…When approaching the failure stage, the steel strands broke suddenly for the beams B-Y-0, B-Y-50, and B-Y-100, as shown in Figure 5. Note that local corrosion (pit) significantly affects the mechanical properties of steel strand (Darmawan and Stewart, 2007; Jeon et al, 2019). The minimum diameters of individual steel wires near the fracture of the steel strands were measured using the micrometer to further characterize the local corrosion, as shown in Table 4, and the minimum diameter can be regard as the representation of the local corrosion damage of steel strand.…”

Section: Resultsmentioning

confidence: 99%

“…Corrosion is one major cause of long-term deterioration in pretensioned concrete (PSC) structures (Harries, 2009; Rinaldi et al, 2010) and could be more serious than that in reinforced concrete (RC) structures due to the high compressive stress applied through prestressed tendons (El Menoufy and Soudki, 2014). On one hand, corrosion of prestressed tendons leads to the cracking and spalling of concrete cover and reduces cross section of prestressed tendons (Jeon et al, 2019; Li et al, 2006; Zhao et al, 2012); on the other hand, the cracking and spalling of concrete cover provide paths for corrosion medium into steel rebars and promote the development of corrosion (Duffo et al, 2004). In addition, tendon corrosion weakens the bond between the tendon and concrete (Wang et al, 2017), and degraded the tensile strength of strands (Li and Yuan, 2013; Wang et al, 2018), resulting in time-dependent prestress loss.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation on long-term behavior of prestressed concrete beams under coupled effect of sustained load and corrosion

Yang

Guo

2020

Advances in Structural Engineering

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Prestressed concrete beams are widely used in construction, while they may be attacked by the corrosion medium during the service. Past research works show that coupled effect of high stress and corrosion can significantly deteriorate the performance of prestressed concrete structures. This article presents an experimental investigation on long-term behavior of prestressed concrete beams under the coupled effect of sustained load and corrosion. During the accelerated corrosion process, six prestressed concrete beams were subjected to different levels of sustained loads, and time-dependent prestress loss and concrete stains were recorded and analyzed. It is observed that the local corrosion (i.e. pitting corrosion) of the steel strands was significantly affected by the sustained load level, and the coupled effect led to more serious damage on the beams than individual sustained load or corrosion. Bending loads were finally applied to investigate the influence of corrosion on flexural capacities of these beams. It was found that the flexural capacities and failure mode of the beams were significantly influenced by corrosion. Meanwhile, the corrosion has more significant effect on tension strength of strands rather than bond strength.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental investigation on long-term behavior of prestressed concrete beams under coupled effect of sustained load and corrosion

Yang

Guo

2020

Advances in Structural Engineering

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“…10(a) shows, the maximum pit-depth of corroded prestressing strand obeys the Gumbel extreme value distribution. Some existing studies also use the Gumbel extreme value distribution model to describe the depth of corrosion pits (Darmawan and Stewart 2007b;Jeon et al 2019). As Fig.…”

Section: Probability Distribution Of Corrosion Pitsmentioning

confidence: 99%

Corrosion Morphology and Mechanical Behavior of Corroded Prestressing Strands

Wang

Tang

Dai

et al. 2020

ACT

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The corrosion morphology and the mechanical behavior of corroded prestressing strands are investigated in the present study. Nineteen corroded strands are obtained through controlling stress level, corrosion time and chloride ion concentration under artificial climate conditions. A total of 119 corrosion pits are counted to investigate the geometric morphology of corrosion pits. A depth-width ratio parameter is first defined to describe the distribution law of corrosion pits, which obeys the lognormal distribution. A tension test is conducted to investigate the mechanical behavior of corroded strands. The fracture morphology and micro-cracks of corroded steel wires are observed by the scanning electron microscopy. A constitutive model is proposed to predict the stress-strain curve of corroded prestressing strands and verified by the experimental results. Results show that the maximum corrosion loss of strand increases by 4.91% when the stress level changes from 45% to 75% of strand yield strength. The high stress level can promote the propagation of corrosion micro-cracks on strand surface. The propagation of corrosion micro-cracks has a significant effect on ultimate strength of strand, while has a little effect on elastic modulus. The proposed model can give an accurate prediction for the stress-strain of corroded prestressing strand.

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“…In recent years, a series of collapse accidents of prestressed concrete bridges have occurred. The investigation results show that the fatigue damage of prestressed steel bar could be accelerated by holes, moisture, and chloride ions in the prestressed duct, and then causes prestressed concrete bridge structure failure [10]. As the most widely used prestressed steel bar, the steel strand is always in the conditions of higher stress levels and smaller cross-sectional area.…”

Section: Introductionmentioning

confidence: 99%

Strain Conditions Monitoring on Corroded Prestressed Steel Strands in Beams Based on Fiber Bragg Grating Sensors

Fan

Lin

et al. 2020

Sensors

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Fiber Bragg Grating (FBG) sensors, with excellent properties, have been widely adopted to monitor the mechanical parameters in civil engineering in recent years. On the other hand, the current study on fatigue performance of corroded prestressed steel strands is still limited, and this is mainly because the long-term strain conditions monitoring is difficult to conduct. Based on the aforementioned considerations, a total of six beam specimens were fabricated in this study. The loading mode of four points bending was adopted in the form of sinusoidal waves in the experiments. On basis of the experimental results, it can be concluded that the fatigue life of the beam decreases sharply with the increase of the corrosion rate of steel strands. Besides, with the increase of the maximum fatigue load, the fatigue life of the beam will decrease significantly. Furthermore, the existing fatigue damage of steel strand inside the beam before corrosion may further accelerate its fatigue failure. As a result, the fatigue life of the beam is reduced because of the stress concentration. Under the same external load, the strain increment and the residual strain of steel strands in the stages of loading and unloading after corrosion increase significantly compared with other stages, while the existing residual strain always shows an increasing trend at various static loading stages. Therefore, the corrosion of steel strand seriously affects not only its mechanical properties, but also its fatigue performance. Finally, the FBG sensors are capable of measuring the steel strand strain, as well as the long-term strain conditions.

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Equivalent material model of corroded prestressing steel strand

Cited by 76 publications

References 7 publications

Experimental investigation on long-term behavior of prestressed concrete beams under coupled effect of sustained load and corrosion

Experimental investigation on long-term behavior of prestressed concrete beams under coupled effect of sustained load and corrosion

Corrosion Morphology and Mechanical Behavior of Corroded Prestressing Strands

Strain Conditions Monitoring on Corroded Prestressed Steel Strands in Beams Based on Fiber Bragg Grating Sensors

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