Prediction of the IC debonding failure of FRP-strengthened RC beams based on the cohesive zone model

Zhang, Jingchun; Guo, Rong; Li, Shengyue; Zhao, Shusen

doi:10.1590/1679-78256208

Cited by 5 publications

(3 citation statements)

References 64 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The model used the bond stress-slip model proposed by Lu et al [20] to characterize the interface elements between the EB FRP and concrete. Zhang et al [34] proposed an FE model for the prediction of IC debonding in FRP-strengthened RC beams based on fracture mechanics and the cohesive zone model. The constructed model also relied on theoretical derivations and available experiments.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Modeling of Debonding Failures in FRP-Strengthened Concrete Beams Using Cohesive Zone Model

et al. 2022

View full text Add to dashboard Cite

Intermediate crack (IC) debonding and concrete cover separation (CCS) are common types of debonding failures in concrete beams flexurally strengthened with fiber-reinforced polymer (FRP) composites. In this paper, a three-dimensional finite element (FE) model was developed to simulate the flexural behavior and predict the critical debonding failure in FRP-strengthened beams. The two critical debonding failures were considered in the FE model by implementing a cohesive zone model based on fracture mechanics considering the effect of the related parameters. The input values used for the cohesive zone model are modified in this study to obtain accurate and consistent predictions. The FE model was validated by comparison with experimental results tested by the authors for beams particularly prone to fail by either of the two critical debonding failures. The results obtained from the FE model agree well with the experimental results for both of the debonding failures and the corresponding capacities at failure. In general, the ratio of the experimental to numerical ultimate capacities was within 5%, and so was the ratio of the experimental to numerical mid-span deflections at debonding failures. The FE model developed in this study was then used to conduct a parametric study investigating the effect of shear span-to-depth ratio and spacing of steel stirrups on the ultimate capacity and type of debonding failure in FRP-strengthened beams. The results of the parametric study revealed that increasing the spacing of steel stirrups caused a significant decrease in the load capacity at concrete cover separation failure. In addition, varying the shear span-to-depth ratio was seen to have an important effect on the type of debonding failure and corresponding capacities for the FRP-strengthened beams having the same cross-section geometry and CFRP reinforcement.

show abstract

Section: Introductionmentioning

confidence: 99%

Finite Element Modeling of Debonding Failures in FRP-Strengthened Concrete Beams Using Cohesive Zone Model

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Based on the relevant codes and experimental studies [6][7][8][10][11][12][25][26][27][28][29][30][31][32], in the primary indicator system, according to the literature [18][19][20][21][22][23][24], as shown in Figure 2, independent indicators and mixed indicators systems are constructed, respectively. Among them, the mixed indicator is a linear combination of independent indicators.…”

Section: Primary Indicator Systemmentioning

confidence: 99%

“…These models for predicting PE and IC debonding have facilitated the study of the debonding failure of FRP-strengthened RC beams. Still, they have significant coefficients of variation between the calculated and experimental values [21,29]. Therefore, it is necessary to conduct a deeper study on debonding failure to establish more accurate models for predicting PE and IC debonding.…”

Section: Introductionmentioning

confidence: 99%

Prediction of the Debonding Failure of Beams Strengthened with FRP through Machine Learning Models

Zhang

2023

Buildings

View full text Add to dashboard Cite

Plate end (PE) debonding and intermediate crack (IC) debonding are the two main failure modes of beams strengthened with fiber-reinforced polymer (FRP) in flexure. Therefore, it is essential to clarify the force state of the structure when debonding occurs in strengthened beams. This paper collected 229 beams with debonding failure as the database, of which 128 were PE debonding and 101 were IC debonding. Correlation and grey correlation analysis were used to establish the indicator systems for predicting PE and IC debonding and to identify the critical indicators among them. Five machine learning models, linear regression, ridge regression, decision trees, random forests, and back propagation (BP) neural networks, were used to build the two debonding prediction models. Optimization of the best prediction among the five machine learning models took place using the Dung Beetle Optimizer (DBO) algorithm, which has competitive performance with state-of-the-art optimization approaches in terms of convergence rate, solution accuracy, and stability. Finally, the optimal prediction model was compared with the models suggested by codes, and it was found that the established model can well predict PE and IC debonding.

show abstract

Experimental tests and numerical simulations on the mechanical response of RC slabs externally strengthened by passive and prestressed FRP strips

Moshiri

Martinelli

Breveglieri

et al. 2023

Engineering Structures

View full text Add to dashboard Cite

Prediction of the IC debonding failure of FRP-strengthened RC beams based on the cohesive zone model

Cited by 5 publications

References 64 publications

Finite Element Modeling of Debonding Failures in FRP-Strengthened Concrete Beams Using Cohesive Zone Model

Finite Element Modeling of Debonding Failures in FRP-Strengthened Concrete Beams Using Cohesive Zone Model

Prediction of the Debonding Failure of Beams Strengthened with FRP through Machine Learning Models

Experimental tests and numerical simulations on the mechanical response of RC slabs externally strengthened by passive and prestressed FRP strips

Contact Info

Product

Resources

About