Behavior and design-oriented model for elliptical FRP-confined concrete under axial compression

Chen, Guipeng; Wang, Yanlei; Yu, Tao; Wan, Baolin; Zhang, Bing; Qing, Liu

doi:10.1016/j.engstruct.2021.113387

Cited by 28 publications

(8 citation statements)

References 75 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This might have been associated with the confinement efficiency being reduced as the column sections became more elliptical, i.e., aspect ratios of 2 and 3. A similar decrease in axial loads was observed by Zeng et al (2021and Chen et al (2021 also in 2021. Columns without CFRP with an aspect ratio of 3 (E-C-0) reduced the axial load to 23.2% of column E-A-0.…”

Section: The Confining Effect Of Carbon Fibre Reinforced Polymer On U...supporting

confidence: 82%

Finite element, analytical, artificial neural network models for carbon fibre reinforced polymer confined concrete filled steel columns with elliptical cross sections

et al. 2023

View full text Add to dashboard Cite

In the present era of architecture, different cross-sectional shapes of structural concrete elements have been utilized. However, this change in shape has a significant effect on load-carrying capacity. To restore this, the use of column confinements with elliptical sections has gained attention. This paper aim to investigate the effect of elliptical shape sections of confined concrete reinforced with Carbon Fiber Reinforced Polymer (CFRP) and steel tube on axial load-carrying capacity. This study is achieved using following tools Finite Element (FE) in Abaqus and Artificial Neural Networks (ANN) modeling. The study involved a 500-mm-high column with three sets of aspect ratios: 1.0, 1.5, and 2.0. In each aspect ratio, three different layers of CFRP were used, i.e., .167, .334, and .501-mm. Analytical results showed that with the increase in aspect ratio from 1 to 2, there is a decrease in ultimate axial load of about 23.2% on average. In addition, the combined confining pressure of steel tube and CFRP increases with a decrease in dilation angle as the number of CFRP layers increases. The failure mode for the column with a large aspect ratio is local buckling at its mid-height along the minor axis. The result showed a good correlation between FE and experimental results of ultimate stress and strains, with a mean squared error of 2.27 and .001, respectively. Moreover, ANN and analytical models showed a delightful correlation of R2 of .97 for stress models and .88 for strain models, respectively. The elliptical concrete section of the column confined with steel tubes can be adopted for a new architectural type of construction; however, with more than three aspect ratios, the wrapping of the section with CFRP jackets is highly recommended.

show abstract

Section: The Confining Effect Of Carbon Fibre Reinforced Polymer On U...supporting

confidence: 82%

Finite element, analytical, artificial neural network models for carbon fibre reinforced polymer confined concrete filled steel columns with elliptical cross sections

et al. 2023

View full text Add to dashboard Cite

show abstract

“…Since the tensile strength of CFRP at failure is usually lower than that obtained from the plane tensile test (Chen et al, 2022, 2023), Lam and Teng (2004) suggested using a discount factor of 0.58 for the tensile strength obtained from the plane tensile test of CFRP, so the tensile strength of CFRP was taken as 0.58fcf for the calculation of the CFRP tensile stress. Figure 9 illustrates the stress state of the circular CFRP-CFDSTs.…”

Section: Discussionmentioning

confidence: 99%

Analytical and experimental investigation on axial compression capacity of carbon fiber-reinforced plastic-confined concrete-filled double-skin steel tube stub columns

Tang

Qin

Hong

et al. 2023

Advances in Structural Engineering

View full text Add to dashboard Cite

Concrete-filled double-skin steel tubes (CFDSTs) are widely used in civil engineering. During the service life of CFDSTs, their bearing capacity can be easily weakened by the corrosion of outer steel tubes. This study investigated the interaction mechanism and reinforcement effects of carbon fiber-reinforced plastic (CFRP)-confined CFDSTs under axial compression. Typical failure modes, axial load-shortening curves, and axial load-strain behaviors of CFDST and CFRP-confined CFDST (CFRP-CFDST) specimens were obtained. The test results showed that the ultimate bearing capacity of stub columns with concrete strength of C40 and C60 increased by 19.78% and 15.12%, respectively, when wrapped with two layers of CFRP sheets, and by 41.60% and 37.99%, respectively, when wrapped with four layers of CFRP sheets. In addition, the FE modeling of CFRP-CFDSTs was established and validated by experimental results. On this basis, the parametric analysis was conducted. To avoid local buckling and yield failure of the inner steel tubes before the outer steel tubes, a calculation formula was proposed for predicting the minimum wall thickness of the inner tube. Furthermore, the prediction formulas for the bearing capacity of CFDSTs and CFRP-CFDSTs were proposed.

show abstract

“…Many researches have demonstrated the effectiveness of the rehabilitation technique for buildings and structures by bonding composite materials which are used as external reinforcement (Li et al, 2022;Ait Taleb and Si Salem, 2015;Sirach et al, 2022;Ismail et al, 2019;Huang et al, 2022;Zeng et al, 2017;Wang et al, 2018;Shayanfar et al, 2022;Chen et al, 2021aChen et al, , 2021bGuo et al, 2022;Djenad et al, 2022aDjenad et al, , 2022bZeng et al, 2019;Ozbakkaloglu and Lim, 2013;Michael and Georgiou, 2022;Zhu et al, 2022;Wang et al, 2022). In addition, numerous studies have been conducted to study the behavior and to estimate the capacities of columns fully wrapped with FRP (Wang et al, 2018;Shayanfar et al, 2022;Chen et al, 2021aChen et al, , 2021b. One can cite the experimental works of Lam et al (2021) about the axial compressive behavior of ultrahigh performance concrete externally and fully confined with FRP.…”

Section: Introductionmentioning

confidence: 99%

“…One can cite the experimental works of Lam et al (2021) about the axial compressive behavior of ultrahigh performance concrete externally and fully confined with FRP. Also, Chen et al (2021aChen et al ( , 2021b have investigated the behavior of fully FRP confined elliptical concrete stub columns submitted to axial compression. Authors have highlighted the effects of the amount of FRP confinement and the high strength of unconfined concrete.…”

Section: Introductionmentioning

confidence: 99%

“…In this connection, Woldemariam et al (2020) have used the Monte Carlo simulation to evaluate the failure probability and reliability of the strength reduction factor of confined concrete columns with unplasticized polyvinyl chloride tube. Using the same subset simulation method, Chen et al (2021aChen et al ( , 2021b recommended probabilistic prediction and explicit databases for adjustments and fitting of deterministic models for strength and strain enhancement in external wrapping of CFRP on reinforced concrete (RC) columns. Ahmad and Raza (2020) provided a reliability approach of confinement-strength models to estimate the outcome of concrete cylinders confined with CFRP through artificial neural network.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental behavior and reliability of predamaged concrete columns externally repaired with FRP spiral strips under axial compression

Ahmed

Salem²,

Taleb³

et al. 2022

WJE

View full text Add to dashboard Cite

Purpose This paper aims to investigate the experimental behavior and the reliability of concrete columns repaired using fiber-reinforced polymers (FRPs) under axial compression loading. The expression of the ultimate axial resistance was assessed from the experimental data of damaged concrete cylinders repaired by externally bonded double-FRP spiral strips. Design/methodology/approach The tested columns bearing capacity mainly depends of the elasticity modulus of both damaged and undamaged concrete have been considered in addition to the applied load and the cylinder diameter as random variables in the expression of the failure criterion. The reliability indicators were assessed using first order second moment method. Findings The emphasized test results, statistically fitted show that the strength has been retrofitted for all repaired specimens whatever the degree of initial damage. However, the gain in axial strength is inversely proportional to the degree of damage. Originality/value The efficiency of a new FRP repair procedure using double-spiral strips was studied. This research provides a technical and economical solution for retrofitting existing concrete columns. Finally, the random character of the variables that govern the studied system shows the accuracy and safety of the proposed original design.

show abstract

Behavior and design-oriented model for elliptical FRP-confined concrete under axial compression

Cited by 28 publications

References 75 publications

Finite element, analytical, artificial neural network models for carbon fibre reinforced polymer confined concrete filled steel columns with elliptical cross sections

Finite element, analytical, artificial neural network models for carbon fibre reinforced polymer confined concrete filled steel columns with elliptical cross sections

Analytical and experimental investigation on axial compression capacity of carbon fiber-reinforced plastic-confined concrete-filled double-skin steel tube stub columns

Experimental behavior and reliability of predamaged concrete columns externally repaired with FRP spiral strips under axial compression

Contact Info

Product

Resources

About