Fatigue performance simulation of reinforced concrete beams externally strengthened with side bonded CFRP sheets

Zou, Chuanlong; Ibrahim, Zainah; Hashim, Huzaifa; Liang, Qing Quan; Ayough, Pouria; Jameel, Mohammed

doi:10.1016/j.engstruct.2024.118530

Engineering Structures

2024

DOI: 10.1016/j.engstruct.2024.118530

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Fatigue performance simulation of reinforced concrete beams externally strengthened with side bonded CFRP sheets

Chuanlong Zou,

Zainah Ibrahim,

Huzaifa Hashim

et al.

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2024

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Cited by 3 publications

References 59 publications

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Flexural performance of BFRP grid–ECC in strengthening damaged RC beams

Deng,

Liu,

Zhou

et al. 2024

Structures

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Flexural performance of BFRP grid–ECC in strengthening damaged RC beams

Deng,

Liu,

Zhou

et al. 2024

Structures

View full text Add to dashboard Cite

Equivalent Fatigue Constitutive Model Based on Fatigue Damage Evolution of Concrete

Chen,

Sun,

Zhang

et al. 2024

Applied Sciences

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Concrete structures such as bridge decks and road pavements are subjected to repetitive loading and are susceptible to fatigue failure. A simplified stress–strain analysis method that can simulate concrete behavior with a sound physical basis, acceptable prediction precision, and reasonable computation cost is urgently needed to address the critical issue of high-cycle fatigue in structural engineering. An equivalent fatigue constitutive model at discrete loading cycles incorporated into the concrete damaged plasticity model (CDPM) in Abaqus is proposed based on fatigue damage evolution. A damage variable is constructed from maximum fatigue strains, and fatigue damage evolution is described by a general equation whose parameters’ physical meaning and value range are identified. With the descending branch of the monotonic stress–strain curve as the envelope of fatigue residual strength and fatigue damage evolution equation as shape function, fatigue residual strength, residual stiffness, and residual strain are calculated. The equivalent fatigue constitutive model is validated through comparison with experimental data, where satisfactory simulation results were obtained for axial compression and flexural tension fatigue. The model’s novelty lies in integrating the fatigue damage evolution equation with CDPM, explicitly explaining performance degradation caused by fatigue damage. The proposed model could accommodate various forms of concrete constitution and fatigue stress states and has a broad application prospect for fatigue analysis of concrete structures.

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In Situ Testing Evaluation and Numerical Simulation of CFRP-Strengthened Reinforced Concrete Two-Way Slab with Initial Defect

Sheng,

Gong

2024

Buildings

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Carbon fiber-reinforced polymer (CFRP) composites, renowned for their high strength-to-weight ratio, are increasingly utilized in the strengthening of structural components. The application of CFRP for strengthening concrete components notably improves the cracking moment and substantially elevates the ultimate load-bearing capacity. This study focuses on a reinforced concrete (RC) two-way slab with an initial defect, specifically an initial deflection. To avert deformations or damages that could break structural integrity during service, the slab was strengthened by adhering CFRP to its underside. An in situ multi-stage loading test was conducted to evaluate the load-bearing capacity of the CFRP-strengthened slab, and the findings revealed that the mid-span deflection of the two-way slab incrementally reached 1.64 mm after the loading stages, with no observable signs of concrete cracking, debonding, or tearing of the CFRP-strengthened slab. The failure modes indicated a transition from concrete compression damage to CFRP anchorage stress concentrations, highlighting the effective stress distribution and load-sharing synergy provided by CFRP-strengthening. Additionally, a numerical model based on the finite element (FE) method was developed using ABAQUS to simulate the component’s performance during the loading process. A comparison between the measured mid-span deflection of the strengthened slab and the numerically simulated values confirmed the high accuracy and rationality of the simulation method. Utilizing the validated numerical model, an analysis of the slab’s ultimate load capacity was conducted, demonstrating that the CFRP strengthening technique effectively increased the load-bearing capacity of the initially imperfect RC two-way slab by nearly 50%.

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Fatigue performance simulation of reinforced concrete beams externally strengthened with side bonded CFRP sheets

Cited by 3 publications

References 59 publications

Flexural performance of BFRP grid–ECC in strengthening damaged RC beams

Flexural performance of BFRP grid–ECC in strengthening damaged RC beams

Equivalent Fatigue Constitutive Model Based on Fatigue Damage Evolution of Concrete

In Situ Testing Evaluation and Numerical Simulation of CFRP-Strengthened Reinforced Concrete Two-Way Slab with Initial Defect

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