Probabilistic assessment of FRP-confined reinforced concrete columns

Baji, Hassan; Ronagh, Hamid Reza; Li, Chun‐Qing

doi:10.1016/j.compstruct.2016.07.003

Cited by 26 publications

(15 citation statements)

References 64 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Therefore, it is suggested that COV of t f and E f can be taken to be 0.08 and 0.1, respectively. As can be seen in Table 4, Weibull or Gumbel distribution can be used for t f , whereas Gumbel or Lognormal distribution is better fitted for E f which is denoted to results extracted from Reference [39]. It is also assumed that f co , H, and D follow the Normal distribution with COV of 0.18, 0.1, and 0.1, respectively [56].…”

Section: F CC F Comentioning

confidence: 99%

“…Keshtegar [26] and Keshtegar and Miri [38] used conjugate HL-RF (CHL-RF) for analyzing corroded pipes and conical structure and found that CHL-RF improved the convergence speed of FORM for nonlinear problems. Baji et al [39] conducted reliability analysis of reinforced concrete columns retrofitted with FRP wrap under eccentric axial loading. They applied the advanced first-order Second moment method for reliability analysis.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Reliability Analysis of FRP-Confined Concrete at Ultimate using Conjugate Search Direction Method

et al. 2020

View full text Add to dashboard Cite

In this paper compressive strength and ultimate strain results in the current database of fiber-reinforced polymer (FRP)-confined concrete are used to determine the reliability of their design space. The Lognormal, Normal, Frechet, Gumbel, and Weibull distributions are selected to evaluate the probabilistic characteristics of six FRP material categories. Following this, safety levels of the database are determined based on a probabilistic model. An iterative reliability method is developed with conjugate search direction for evaluating the reliability. The results show that Lognormal and Gumbel distributions provide best probability distribution for model errors of strength and strain enhancement ratios. The developed conjugate reliability method provides improved robustness over the existing reliability methods owing to its faster convergence to stable results. The results reveal that the part of the database containing normal strength concrete (NSC) heavily confined (i.e., actual confinement ratio (flu,a/f’co) > 0.5) by low and normal modulus carbon fibers (i.e., fiber elastic modulus (Ef) ≤ 260 GPa) and moderately confined (i.e., 0.3 ≤ flu,a/f’co ≤ 0.5) by aramid fibers exhibits a very high safety level. The segments of the database with a low and moderate safety level have been identified as i) NSC moderately and heavily confined by higher modulus glass fibers (i.e., Ef > 60 GPa), ii) high strength concrete (HSC) moderately and heavily confined (i.e., flu,a/f’co > 0.3) by glass fibers, iii) HSC lightly confined (i.e., flu,a/f’co ≤ 0.2) by carbon fibers, and iv) HSC lightly confined by aramid fibers. Additional experimental studies are required on these segments of the database before they can be used reliably for design and modeling purposes.

show abstract

Section: F CC F Comentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reliability Analysis of FRP-Confined Concrete at Ultimate using Conjugate Search Direction Method

et al. 2020

View full text Add to dashboard Cite

show abstract

“…The primary reasons stem from the increase in loading conditions, manufacturing defects, changes in intended usage, or design code requirements and progress in the deterioration mechanisms due to aging of the structure . Uncertainty related to material degradation and some design parameters can dramatically affect the mechanical behavior and expected failure modes over the lifetime of strengthened structures . A key factor in the robustness of strengthening design is comprehensive consideration of the possible failure modes and the durability of materials subjected to harsh environmental conditions.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3] Uncertainty related to material degradation and some design parameters can dramatically affect the mechanical behavior and expected failure modes over the lifetime of strengthened structures. 4 A key factor in the robustness of strengthening design is comprehensive consideration of the possible failure modes and the durability of materials subjected to harsh environmental conditions. Many advantages have been recognized for the application of fiber-reinforced polymer (FRP) to strengthen RC elements.…”

mentioning

confidence: 99%

Life cycle reliability assessment of reinforced concrete beams shear‐strengthened with carbon fiber reinforced polymer strips in accordance with fib bulletin 14

Taki

Firouzi

Mohammadzadeh

2018

Structural Concrete

View full text Add to dashboard Cite

The results of time‐variant reliability analysis of shear‐strengthened reinforced concrete (RC) beams with externally bonded fiber‐reinforced polymer (FRP) are presented with an emphasis on the effects of environmental harshness and effective design parameters. The effects of chloride‐induced pitting corrosion and FRP degradation are considered using Monte Carlo simulation to assess the influence of environmental deterioration on the fib 2001 limit states instead of applying design reduction factors. For the defined worked example, the proposed method specifies the remaining lifetime of the strengthened beam by considering a reasonable value for the target reliability index. With regard to the reliability index profiles, it is shown that chloride‐induced pitting corrosion has a greater effect on the shear capacity of strengthened beams than the degradation of the FRP. It was found that the FRP reinforcement ratio has a considerable effect on the governing failure mode; hence, it is important to calibrate the proposed safety verifications of fib bulletin 14 using sufficient experimental data for the relevant random variables in a reliability‐based context.

show abstract

“…Modelling the constitutive behaviour of FRP confined concrete has been the subject of many investigations [6][7][8][9]. A comprehensive review of models developed to predict the axial stress-strain behaviour of FRP-confined concrete in circular sections can be found in [10].…”

Section: Introductionmentioning

confidence: 99%

Jacketing of existing reinforced concrete structures with composites in view of seismic rehabilitation

2018

View full text Add to dashboard Cite

Seismic rehabilitation of pre-code existing buildings requires the choice of the method of strengthening and the determination of the amount of materials to be used optimally. Accurate evaluation of the building response in terms of its capacity at the initial state and that obtained after application of some reinforcement should be performed. For regular buildings, the nonlinear static analysis procedure constitutes a powerful tool that is used to estimate seismic performance. This procedure is characterised by its high effectiveness to account for the non-linear characteristics of the materials involved and provides a direct mean to shape the capacity curve of the construction; enabling then to make the correct decision about rehabilitation task with regards to a desired performance state. In this work, the nonlinear static pushover analysis was performed by means of ZeusNL software. Use was made of the Moroccan seismic regulations RPS2000 version 2011to determine the targeted seismic demand. Considering a four floor reinforced concrete building which is undersized with regards to actual seismic regulation, jacketing with fiber reinforced composites at different reinforcement rates was analyzed. The obtained results were expressed in terms of the lateral resistance capacity and the building tip displacement. Optimal jacketing of columns was then determined.

show abstract

Probabilistic assessment of FRP-confined reinforced concrete columns

Cited by 26 publications

References 64 publications

Reliability Analysis of FRP-Confined Concrete at Ultimate using Conjugate Search Direction Method

Reliability Analysis of FRP-Confined Concrete at Ultimate using Conjugate Search Direction Method

Life cycle reliability assessment of reinforced concrete beams shear‐strengthened with carbon fiber reinforced polymer strips in accordance with fib bulletin 14

Jacketing of existing reinforced concrete structures with composites in view of seismic rehabilitation

Contact Info

Product

Resources

About