Stress-strain relationship of FRP confined concrete columns under combined axial load and bending moment

Cao, Yugui; Wu, Yu-Fei; Jiang, Cheng

doi:10.1016/j.compositesb.2017.09.063

Cited by 70 publications

(23 citation statements)

References 54 publications

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“…Parameter n should be constant. Recent studies also indicated that the FRP-confinement stiffness, concrete compressive strength, and concrete damage level did not affect the parameter n value [11,12,34,36]. The performance of the n value is shown in Figure 10b, in which AV = 1.01 and IAE = 0.11.…”

Section: Analytical Stress-strain Modelingmentioning

confidence: 86%

Effect of Strain Rates on the Stress–Strain Behavior of FRP-Confined Pre-Damaged Concrete

et al. 2020

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There are many studies on fiber-reinforced polymer (FRP)-confined pre-damaged concrete under quasi-static strain rates. However, few studies have focused on FRP-confined pre-damaged concrete under high strain rates. Thus, an experimental and analytical investigation was conducted to obtain the mechanical behavior of FRP-confined pre-damaged concrete under different strain rates. The results show that the stress–strain curves, ultimate stress, and strain values were affected by strain rate and the extent of concrete damage. A stress–strain model of FRP-confined pre-damaged concrete considering the strain rate was developed by modifying a stress–strain model of FRP-confined pre-damaged concrete under quasi-static loading. The proposed model was evaluated by using test data. The evaluation results show that the proposed model can predict the stress–strain behavior of FRP-confined pre-damaged concrete under different strain rates.

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Section: Analytical Stress-strain Modelingmentioning

confidence: 86%

Effect of Strain Rates on the Stress–Strain Behavior of FRP-Confined Pre-Damaged Concrete

et al. 2020

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“…Many experimental investigations on eccentrically loaded FRP confined columns have been carried out on circular columns [ 30 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 ] and noncircular columns [ 28 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 ]. Other investigations [ 29 , 31 , 51 ] focused on finite element modeling (FEM) to investigate the effect of the load eccentricity on FRP-confined concrete columns.…”

Section: Introductionmentioning

confidence: 99%

Axial Strength of Eccentrically Loaded FRP-Confined Short Concrete Columns

Jiang

2020

Polymers

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This paper presents an experimental program that includes 78 fiber reinforced polymer (FRP)-confined square concrete columns subjected to eccentric loading. The degradation of the axial strength of FRP-confined short concrete columns due to the load eccentricity is investigated in this work. A larger load eccentricity leads to a greater decrease in the axial strength. From the test results, it is found that FRP confinement can cause less strength degradation compared with that of unconfined concrete specimens. For FRP-confined square concrete specimens, the strength enhancement due to FRP confinement increases with increasing load eccentricity. However, the increasing load eccentricity decreases the confinement efficiency for FRP-confined circular concrete specimens. The relationship between the strength of eccentrically loaded FRP-confined square columns and their corner radii is evaluated.

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“…The benefits of this technique are the improvement of the axial strength, strain ductility and energy dissipation capacity of the confined concrete. Thus, the behavior of concrete columns confined with FRP has been extensively studied, leading to a significant number of stress–strain models, some focused on circular cross-sections [ 1 , 2 , 3 , 4 , 5 ] and others focused on square and rectangular ones [ 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 ]. In addition to that, some studies are concentrated on modeling the stress–strain behavior of both circular and non-circular FRP confined concrete columns [ 17 , 18 , 19 , 20 , 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

“…Megalooikonomou and Papavasileiou [ 27 ] also proposed an iterative approach to model both the axial and lateral stress–strain response of square and rectangular FRP-confined RC concrete columns with sparse stirrups, so that the contribution of the stirrups is not taken into account. Except for the studies by Cao et al [ 5 ], Eid and Paultre [ 9 ], Isleem et al [ 10 ] and Wang and Isleem [ 17 ], which refer to columns with internal steel reinforcement, most of these models do not take into account the presence of the internal steel reinforcement.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Ultimate Strain for Rectangular Reinforced Concrete Columns Confined with Fiber Reinforced Polymers under Cyclic Axial Compression

Fanaradelli

Rousakis

2020

Polymers

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This paper investigates the crucial design parameters for the prediction of the ultimate axial compressive deformation of reinforced concrete columns externally confined with fiber reinforced polymer (FRP) materials. Numerous test results of available columns with a square and rectangular section under cyclic axial loading were gathered in an advanced database. Herein, the database is enriched with necessary design parameters in order to address the unique tensile strain field variation of the FRP jacket. Since there is a lack of consequent recording of the FRP strain field in existing experiments, three dimensional pseudodynamic finite element analyses results from several characteristic cases of tested columns are utilized to address this gap. Therefore, a hybrid experimental–analytical database is formed, including several critical FRP strains, steel strains and deformations. A modified model is proposed to predict the ultimate axial strain for reinforced concrete columns externally confined with FRP materials. The proposed model aims to address indirectly the effects of the internal steel cage, concrete section shape and of their interaction with the external FRP jacket on the critical tensile strain of the FRP jacket at failure of the column. The predictive performance of the model over the available tests of (reinforced concrete) RC columns under cyclic compression is remarkably improved when compared against the performance of other existing models. It provides predictions with average ratio (AR) of 0.96 and average absolute error (AAE) of 36.5% and therefore may contribute to safer seismic resistant redesign.

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Stress-strain relationship of FRP confined concrete columns under combined axial load and bending moment

Cited by 70 publications

References 54 publications

Effect of Strain Rates on the Stress–Strain Behavior of FRP-Confined Pre-Damaged Concrete

Effect of Strain Rates on the Stress–Strain Behavior of FRP-Confined Pre-Damaged Concrete

Axial Strength of Eccentrically Loaded FRP-Confined Short Concrete Columns

Prediction of Ultimate Strain for Rectangular Reinforced Concrete Columns Confined with Fiber Reinforced Polymers under Cyclic Axial Compression

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