Performance deterioration of corroded RC beams and reinforcing bars under repeated loading

Sun, Junzu; Huang, Qiao; Ren, Yuan

doi:10.1016/j.conbuildmat.2015.08.066

Cited by 53 publications

(15 citation statements)

References 40 publications

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“…In general, the loss of flexural strength of test specimens subjected to fatigue and corrosion was almost twice the loss of flexural strength of those subjected to corrosion only (CHEN; ZHENG; WAND, 2009). Further research carried out later observed that the increase in the degree of corrosion of the reinforcement decreased the fatigue strength of reinforced concrete beams, causing them to fracture fragile (YI et al, 2010;SUN;HUANG;REN, 2015). These studies found that beams with noncorroded reinforcements withstood more than 2,000,000 cycles of fatigue, in other words, the fatigue test did not significantly influence the performance of the studied beams.…”

Section: Literature Reviewmentioning

confidence: 98%

Experimental analysis on the combined effects of corrosion and fatigue in reinforced concrete beams

Stein

Graeff

2019

Ambient. constr.

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nfrastructure elements, especially reinforced concrete bridges and viaducts, are exposed to a combination of degrading processes throughout their life cycle, such as corrosion and fatigue. The combined effects of both processes are known to be more harmful to the structure than the sum of both deterioration processes considered individually. Due to the limited amount of studies in this field, this research aims to evaluate, by experimental analysis, the combined effects of fatigue and corrosion on reinforced concrete beams. Eight beams measuring 7 x 14 x 130 cm were cast and divided in four groups of 2 beams each: one group for reference beams, one for corroded beams with a loss of mass of 10%, one for beams subjected to 200,000 cycles and the last for corroded fatigued beams. The results show that the combined processes drastically reduce the load capacity of the beams by less than half compared to the reference beams. It was also observed that fatigue life decreased and the failure mode changed to fragile.

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Section: Literature Reviewmentioning

confidence: 98%

Experimental analysis on the combined effects of corrosion and fatigue in reinforced concrete beams

Stein

Graeff

2019

Ambient. constr.

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“…The reason can be concluded that the performance deterioration of the specimens supplies a specific stress state variation for the rebar at the bottom in this work which is different from that in literature [10,22], due to the different processes of material degradation (e.g., the concrete degradation caused by fatigue cracks [10,[23][24][25][26], the prestressed strand degradation resulted from fatigue plasticity [27]), specimen stiffness degradation and curvature variation [8][9][10][11][12][13][14], and so forth. Thirdly, the corrosion of the rebar generally results in an obvious reduction of specimen fatigue life [4,6,8,21]. It causes an obviously lower fatigue life predicted by the model [21] compared with that by the other models (Figure 8(c)); therefore, the corrosion of rebar influences the fatigue life of the bridge.…”

Section: S-n Modelmentioning

confidence: 99%

“…In detail, Figure 8 and (2) show that the bridge subjected to the train loading with a 30-ton axle weight (i.e., Δσ r ≈ 120 MPa) satisfies the fatigue life requirement of the Chinese standard [20] (i.e., N f ≈ 10 6.57 ≈ 3.7 × 10 6 > 2.0 × 10 6 ). However, considering the environmental effects, such as the corrosion of rebar/prestressed strand, especially taking into account the negative effects of the low quality of concrete casting, and so forth, the coupling of train loads and environmental effects generally highly reduces the fatigue life of the bridge compared with that only of train loading [4,6,8,21] (see Figure 8(c)). …”

Section: Performance Deterioration Of Heavy-haul Railwaymentioning

confidence: 99%

“…As an essential method, the experimental investigations in the literature are generally able to be concluded in the following three aspects: the investigation on the fatigue performance deterioration of the reinforced concrete (RC) beams or strengthened RC beams [4][5][6][7], the investigation on that of the partially prestressed concrete (PC) beams [8][9][10][11][12][13][14], and the investigation on that of the heavy-haul railway bridges [15][16][17]. For example, Zhang et al [8] observed on the partially PC beams with corroded rebars and found out that the fatigue life of the beams decreases and the rate of the stiffness degradation and the midspan deflection development grows with the corrosion ratio increasing.…”

Section: Introductionmentioning

confidence: 99%

“…Secondly, Luo et al [16] investigated on the variation of the midspan deflection, the stiffness, and the material strain during the fatigue life and developed a simplified analysis method on the variation, based on the scale model experiments; literature [15] developed a stiffness degradation model and a related damage evolution model. However, initially, the investigation results in literature [4][5][6][7][8][9][10][11][12][13][14]16] are generally not applicable to the performance deterioration of the heavy-haul railway bridges (i.e., PC beams), due to the different material/structural parameters or fatigue loading. For example, literature [4][5][6][7] observed on the performance deterioration of the RC beams but not PC beams, literature [8][9][10][11][12][13][14] focused on that of PC beams with rectangular sections [8-10, 12, 14] or different dimension T-type sections [11,13] compared with the typical heavy-haul railway bridges of T-type sections, and literature [16] analyzed that of unbonded PC beams rather than the bonded bridges.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Performance Deterioration of Heavy-Haul Railway Bridges under Fatigue Loading Monitored by a Multisensor System

Shan

Yuan

et al. 2018

Journal of Sensors

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Heavy-haul railway bridges play an increasingly essential role in the transportation in China due to the increasing transport volume. The performance deterioration of the scale models of a typical heavy-haul railway bridge under fatigue loading is monitored in this work, based on a multisensor system including the fiber-reinforced polymer optical fiber Bragg grating and electrical resistance strain gauges, linear variable displacement transducer, and accelerometer. Specifically, by monitoring/ observing on the failure mode, fatigue life, load-midspan deflection response, material strain development, and so forth, this work develops an S-N model by comparing the relationship between fatigue life and rebar stress range with that between fatigue life and load level and proposes a damage evolution model considering the coupling of the stiffness degradation and inelastic deformation of specimens. It is found that the fatigue life of specimens is determined by the fatigue life of the rebar at the bottom and it may be lower than 2.0 million cycles with a 30-ton axle weight when environmental factors are taken into account. The predictions of the models agree well with experimental results. Therefore, this work furthers the understanding of the fatigue performance deterioration of the bridges by using a multisensor system.

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Numerical analysis of high and low‐cycle flexural fatigue for reinforced concrete beams under full‐range of varying amplitudes

Huang

Gong

Jin

et al. 2021

Structural Concrete

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Structural reinforced concrete (RC) experiences cyclic loads during their service life, and in practice, the load amplitude can always change, which will lead to a mixed high and low-cycle fatigue failure. This paper aims to investigate the fatigue behaviors of RC beams under different load levels and more importantly, their sequential effects. Based on the path-dependent constitutive models, the structural degradation under different repeated loads are comprehensively investigated by numerical simulation of higher consistency with the reality. It is fairly indicated that a clear bi-linear character may exist in the socalled S-N diagram, of which the high-cycle fatigue failure is attributed to rupture of main reinforcement under tension, while the low-cycle fatigue failure is controlled by the concrete failure in flexural compression zone. A simple design method to consider mixed low and high cycle fatigue is proposed to quantify this bi-linear character. For the varying amplitude of cyclic loads, the high-to-low loading sequence may cause a shortened fatigue life. More interestingly, if a rather high heavy load (0.85 or 0.95 of the static capacity) is applied just once before ordinary fatigue loads (ex. 0.6), the deflection may significantly increase, while the stiffness and final fatigue life would be slightly reduced in view of nonlinear mechanics.

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Performance deterioration of corroded RC beams and reinforcing bars under repeated loading

Cited by 53 publications

References 40 publications

Experimental analysis on the combined effects of corrosion and fatigue in reinforced concrete beams

Experimental analysis on the combined effects of corrosion and fatigue in reinforced concrete beams

Performance Deterioration of Heavy-Haul Railway Bridges under Fatigue Loading Monitored by a Multisensor System

Numerical analysis of high and low‐cycle flexural fatigue for reinforced concrete beams under full‐range of varying amplitudes

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