Evaluating the shear design equations of FRP-reinforced concrete beams without shear reinforcement

Ali, Ahmed H.; Mohamed, Hamdy M.; Chalioris, Constantin E.; Deifalla, Ahmed Farouk

doi:10.1016/j.engstruct.2021.112017

Cited by 53 publications

(23 citation statements)

References 45 publications

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“…Vital infrastructures suffer from the risk of demolition due to a lack of maintenance, severe environmental conditions due to steel corrosion, and the sudden nature of slabcolumn connection failures. Thus, fiber-reinforced polymers (FRPs) are replacing steel to avoid problems due to steel corrosion because of their excellent properties, which include, but are not limited to, being non-corrosive in nature, having a high strength-to-weight ratio, and performing well under fatigue [1][2][3][4][5]. It is worth noting that, back in the 90's, FRPs were used for strengthening structures and continue to be valuable in this field [6,7].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Strength of Slab-Column Connections with FRPs Using Machine Learning Algorithms

Salem

Deifalla

2022

Polymers

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Slab–column connections with FRPs fail suddenly without warning. Machine learning (ML) models can model the behavior with high precision and reliability. Nineteen ML algorithms were examined and compared. The comparisons showed that the ensembled boosted tree model showed the best, most precise prediction with the highest coefficient of determination (R2) (0.98), the lowest Root Mean Square Error (RMSE) (44.12 kN), and the lowest Mean Absolute Error (MAE) (35.95 kN). The ensembled boosted model had an average of 0.99, a coefficient of variation of 12%, and a lower 95% of 0.97, respectively, in terms of the measured strength. Thus, it was found to be more accurate and consistent compared to all implemented machine learning models and selected traditional models. In addition, the significance of various parameters with respect to the predicted strength was identified, where the effective depth was the most significant by a factor of 0.9, and the concrete compressive strength was the lowest by a factor of 0.3.

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Section: Introductionmentioning

confidence: 99%

Evaluation of the Strength of Slab-Column Connections with FRPs Using Machine Learning Algorithms

Salem

Deifalla

2022

Polymers

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“…To some extent, FRP can be regarded as a conventional material in civil engineering after more than 30 years research and application, especially in the field of structure retrofitting. Currently, the application of FRP is gradually expanding into new construction [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

I-shaped ECC/UHPC composite beams reinforced with steel bars and BFRP sheets

Dong¹,

Ji²,

Liu³

et al. 2022

Sustain. Struct.

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This paper proposes a new type of small-sized I-shaped engineered cementitious composite (ECC)/ ultra-high performance concrete (UHPC) composite beam which has the potential to be suitable for corrosive environments. The lower tensile part of the beam was made of ECC material (2/3 of the height), and the top compressive part was made of UHPC material (1/3 of the height). Inner embedded steel bars and surface-bonded basalt fiber reinforced polymer (BFRP) sheets were adopted as the reinforcing materials in combination. A total of nine I-shaped beams were designed and tested under four-point bending test. The influence of parameters such as the ratio of the embedded tensile steel bars, the top UHPC flange, and the surface bonded tensile BFRP sheet on the behavior of the beams was investigated. The results showed that the I-shaped ECC/UHPC composite beams have excellent comprehensive performance, and thanks to the ultra-high durability of the component materials, they have ultra-high durability that ordinary I-steel beams do not have and thus have broad application prospects in corrosive environments. The shear resistance capacity of the thin-walled ECC web needs to be further improved, and UHPC is recommended for the web in the follow-up study.

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“…The concrete members, especially columns, usually require strengthening because of loading eccentricity, impact or seismic loads, or being exposed to harsh environments such as saltwater, chemical substances, or temperature cycles. Accordingly, various studies have been performed on application of FRP sheets and tubes for improving the performance of concrete structural components 11–17 . For instance, in one of the recent studies on FRP‐confined columns, Wang et al 11 experimentally investigated the performance of CFRP‐wrapped RC columns with rectangular sections under eccentrical loads, considering the effects of preloading level.…”

Section: Introductionmentioning

confidence: 99%

“…improving the performance of concrete structural components. [11][12][13][14][15][16][17] For instance, in one of the recent studies on FRP-confined columns, Wang et al 11 experimentally investigated the performance of CFRP-wrapped RC columns with rectangular sections under eccentrical loads, considering the effects of preloading level. Mai et al 12 studied the nonuniform wrapping techniques for improving the failure strength of FRP-confined rectangular columns.…”

Section: Introductionmentioning

confidence: 99%

Predictive model for slenderness limit of circular RC columns confined with FRP wraps

Arabshahi

Tavakkolizadeh

2021

Structural Concrete

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Application of fiber-reinforced polymer (FRP) for retrofitting and rehabilitation of concrete structures is a common method. The main role of FRP confinement for reinforced concrete (RC) columns is to increase the ultimate strength and strain of confined concrete core and therefore improve in the load carrying capacity of the columns. However, it is possible that a previously short column fails due to buckling after the application of FRP confinement. In other words, the enhanced compressive strength of a retrofitted column may go beyond its buckling load. Therefore, a design criterion to predict this condition is necessary for the designers in the preliminary and final stages of the design. In this paper, a predictive model is proposed to determine the slenderness limit of FRPconfined circular RC columns. The suggested relation was derived using one of the accurate design-oriented strength models for FRP-confined concrete columns as well as analytically derived buckling equations. The effect of hybrid FRP confinement is also incorporated in the suggested slenderness limit. Moreover, a parametric study was performed on the suggested model to specify most influential parameters. The accuracy of the proposed relation was evaluated using a database of experimental results collected from previous studies. The results of the evaluations demonstrated acceptable accuracy of the proposed relation in predicting behavior and failure mode of FRP-confined RC columns.

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Evaluating the shear design equations of FRP-reinforced concrete beams without shear reinforcement

Cited by 53 publications

References 45 publications

Evaluation of the Strength of Slab-Column Connections with FRPs Using Machine Learning Algorithms

Evaluation of the Strength of Slab-Column Connections with FRPs Using Machine Learning Algorithms

I-shaped ECC/UHPC composite beams reinforced with steel bars and BFRP sheets

Predictive model for slenderness limit of circular RC columns confined with FRP wraps

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