Role of longitudinal reinforcement on the behavior of under reinforced concrete beams subjected to fatigue loading

Prashanth, M.H.; Singh, P. Johan; Kishen, J.M. Chandra

doi:10.1016/j.ijfatigue.2019.03.047

Cited by 21 publications

(7 citation statements)

References 12 publications

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“…The initiation of failure in reinforced concrete (RC) bridges commonly stems from the failure of reinforcements due to factors like corrosion and fatigue (Su et al, 2022). The fatigue life of a well-designed RC beam is contingent upon the dimensions and quantity of reinforcements (Prashanth et al, 2019). Regarding the fatigue performance of reinforcements, Han et al (2015) identified three stages of residual strain in ordinary reinforcements in partially precast (PC) beams under fatigue loading, proposing a model for predicting fatigue residual strain.…”

Section: Introductionmentioning

confidence: 99%

Fatigue performance analysis of precast segmental assembled concrete beams

Liang,

Ren,

Tong

et al. 2024

Advances in Structural Engineering

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In recent years, assembled bridges have become widely utilized in bridge construction, raising concerns about durability-related bridge diseases over time. These issues significantly impact the fatigue life of assembled bridges, necessitating an in-depth exploration of their fatigue performance. While existing research primarily concentrates on the transverse connection of multiple longitudinal beams, there is a notable dearth of studies on longitudinal precast segmental assembled bridges. This paper addresses this gap by establishing a fatigue benchmark finite element model for segmental assembled concrete beams, building upon existing experiments. The study employs numerical simulation to analyze the entire fatigue process, examining stress distribution, damage development, and considering the influence of reinforcement corrosion. Furthermore, a fatigue life prediction method, based on fatigue residual strength (R), is proposed for predicting the fatigue life (N) of concrete in precast segmental assembled beams. Results reveal that prestressed and ordinary reinforcements experience increasing stress with loading cycles, peaking around 100,000 cycles. Throughout fatigue loading, compressive stress in concrete remains low, preventing fatigue compression failure. However, tensile stress near joints gradually rises, initiating cracks at the mid-span beam’s bottom. With continued cyclic loading, these cracks propagate towards the loading point. The upper and lower limits of fatigue life predicted by the fatigue life prediction method closely align with the compressive fatigue test values of concrete, proposed fatigue life prediction method is efficient and accurate.

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Section: Introductionmentioning

confidence: 99%

Fatigue performance analysis of precast segmental assembled concrete beams

Liang,

Ren,

Tong

et al. 2024

Advances in Structural Engineering

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“…During the operation of heavy-haul railway RC bridges, they are subjected to repeated long-term train loads, leading to a continuous accumulation of fatigue damage in both the steel and concrete components within the structure. Fatigue damage is one of the main reasons for the deterioration of RC beams [9][10][11]. The increase in train axle load and annual traffic volume will increase the risk of fatigue cracking and failure of RC bridges.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Reliability Assessment of RC Beams in Heavy-Haul Railways Based on Point Estimate Method

Shi,

Song,

Cui

et al. 2023

Materials

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Heavy-haul railways have a high passing frequency of trains with a large axle weight, causing rapid accumulation of fatigue damage in reinforced concrete (RC) bridge structures, which significantly affects the safety of the bridges. To study the fatigue reliability of RC beams in heavy-haul railways, the fatigue performance function for RC beams in heavy-haul railways was established, and the fatigue reliability assessment method for bridge structures in heavy-haul railways based on the point estimate method (PEM) was developed. An 8 meter-span plate beam in an existing heavy-haul railway illustrates the method. The train axle weight and dynamic coefficient were considered random variables, and the first four moments of equivalent stress ranges were obtained. The traffic quantity of the heavy-haul railways was investigated, and the fatigue reliability was evaluated using the proposed method. In addition, the effects of annual freight volume and train axle weight on fatigue reliability were discussed. Results indicate that PEM can effectively and accurately evaluate the fatigue reliability of RC beams in heavy-haul railways. In the first 20 years of operation, the fatigue failure probability was less than the limit value specified in the standard. The increase in annual traffic volume and train axle weight will cause a significant increase in fatigue failure probability. The research results of this paper are expected to provide an important basis for the design and maintenance of reinforced concrete bridges for heavy-haul railways in the future.

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“…M.H.P. [12] studied the effect of reinforcement on reinforced concrete beams under bending fatigue load, using acoustic emission technology. The experimental results show that the steel rebar provides remarkable ductility to reinforced concrete beams in which crack opening displacement and mid-span vertical displacement increase with the increase in rebar strain under increasing fatigue load, thus increasing their fatigue life.…”

Section: Introductionmentioning

confidence: 99%

Performance of CRTS-II Ballastless Track–Bridge Structural System Rebars under Fatigue Loading Test

et al. 2021

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To study the evolution of mechanical properties of steel rebars in the China Railway Track System Type II (CRTS II) ballastless track–bridge structural system under repeated train loads, a 1/4 scale three-span ballastless slab track simple-supported bridge structural system specimen was manufactured and subjected to a multistage fatigue test with 18 million cycles. The experimental results show that the strain amplitude of the steel bar changes proportionally to the fatigue stress amplitude, and there is an obvious strain increase in the loading stage 4, where the fatigue stress amplitude is the largest. During the test, the cumulative strain–amplitude ratio first decreases then increases. At the end of the test, the cumulative strain–amplitude ratio increases by 5.46% and 5.32%, respectively, at L/2 and L/4 sections. The load–strain curve of the steel rebar keeps the shape of an oblique straight line. The slope increases first and then decreases with a degradation at the end of the test of 5.14% and 4.82%, respectively, at L/2 and L/4 sections. The mechanical properties of the rebar are enhanced under the first three million fatigue loading cycles: this is the fatigue strengthening stage. The mechanical properties of reinforcement gradually degrade from the three millionth cycle to the end of the test: this is the fatigue damage stage. Finally, based on the material fatigue damage model and the multistage cumulative damage criterion, the change rule of the load–strain curve slope of steel rebars in the fatigue damage stage is obtained by finite element simulation. The simulation results agree well with the experimental data, proving the validity of the calculation method proposed in this paper.

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Role of longitudinal reinforcement on the behavior of under reinforced concrete beams subjected to fatigue loading

Cited by 21 publications

References 12 publications

Fatigue performance analysis of precast segmental assembled concrete beams

Fatigue performance analysis of precast segmental assembled concrete beams

Fatigue Reliability Assessment of RC Beams in Heavy-Haul Railways Based on Point Estimate Method

Performance of CRTS-II Ballastless Track–Bridge Structural System Rebars under Fatigue Loading Test

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