Modeling for complete stress-strain curve of circular concrete columns confined with steel spiral and FRP

Wei, Yang; Miao, Kunting; Zhang, Xi; Zhou, Yongfeng; Zheng, Kaiqi

doi:10.1016/j.jobe.2021.103294

Cited by 12 publications

(6 citation statements)

References 61 publications

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“…However, the data processing of DIC is complex. Installing strain gauges around the mid-height section and laser displacement sensors were adopted in this test, which have been also verified in most previous studies on FRP-confined concrete [ 1 , 2 , 3 , 4 , 5 , 6 ]. Figure 3 b illustrates the layout of the strain gauges and the linear variable displacement transducers (LVDTs).…”

Section: Experimental Programmentioning

confidence: 56%

“…It is well known that steel tubes and fiber reinforced polymer (FRP) material as external confinement of concrete enhances concrete axial compressive strength and ductility significantly [ 1 , 2 , 3 ]. These FRP tubes or steel tubes, acting as stay-in-place structural forms for fresh concrete, can also protect the encased concrete from potentially aggressive environments, e.g., deicing salts and other chemicals [ 4 , 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

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Compressive Behavior of Bamboo Sheet Twining Tube-Confined Concrete Columns

et al. 2021

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This study experimentally investigated various axial compressive parameters of a new type of confined concrete, which is termed bamboo sheet twining tube-confined concrete (BSTCC). This new composite structure was composed of an outer bamboo composite tube (BCT) jacket and a concrete core. Under axial compression, the parameters of thirty-six specimens include concrete strength (i.e., C30 and C50) and BCT thickness (i.e., 6, 12, 18, 24, and 30 layers). The mechanical properties of the BSTCC specimens from the perspective of the failure mode, stress-strain relationship, effect of BCT thickness and dilation behavior were analyzed. The results showed that, in compression, with an increase in BCT thickness in the range of 18-layers of bamboo sheets, the strength increased remarkably. When the strength of the concrete core was high, the confinement effect of the BCT was reduced. In addition, the BCT thickness relieved the dilation of the BSTCC specimens. Finally, the experimental results were compared with predictions obtained from 7 existing FRP-confined concrete models. All the predictions had good agreement with the test results, which further confirmed that the models developed for FRP-confined concrete can provide an acceptable approximation of the ultimate strength of the BSTCC specimens.

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Section: Experimental Programmentioning

confidence: 56%

Section: Introductionmentioning

confidence: 99%

Compressive Behavior of Bamboo Sheet Twining Tube-Confined Concrete Columns

et al. 2021

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“…The formulas for calculating fcu and εcu of FRP-stirrup composite−confined circular concrete columns have been established [65]: ( ) 0.9 0.86 0.75 3.27 5.35…”

Section: Ultimate Stress Fcu and Ultimate Strain εCumentioning

confidence: 99%

“…The peak stress and strain models of FRP-stirrup composite-confined circular concrete columns were obtained [65]. β is the peak strain inhibition coefficient of FRP to stirrupconfined concrete, and its recommended value is 0.65.…”

Section: Peak Stress F CC and Peak Strain ε Ccmentioning

confidence: 99%

Influence of the Cross-Sectional Shape and Corner Radius on the Compressive Behaviour of Concrete Columns Confined by FRP and Stirrups

Wei

Wang

et al. 2022

Polymers

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Axial compression tests were carried out on 72 FRP (fiber reinforced polymer)–stirrup composite−confined concrete columns. Stirrups ensure the residual bearing capacity and ductility after the FRP fractures. To reduce the effect of stress concentration at the corners of the confined square−section concrete columns and improve the restraint effect, an FRP–stirrup composite−confined concrete structure with rounded corners is proposed. Different corner radii of the stirrup and outer FRP were designed, and the corner radius of the stirrup was adjusted accurately to meet the designed corner radius of the outer FRP. The cross−section of the specimens gradually changed from square to circular as the corner radius increased. The influence of the cross−sectional shape and corner radius on the compressive behaviour of FRP–stirrup composite−confined concrete was analysed. An increase in the corner radius can cause the strain distribution of the FRP to be more uniform and strengthen the restraint effect. The larger the corner radius of the specimen, the better the improvement of mechanical properties. The strength of the circular section specimen was greatly improved. In addition, the test parameters also included the FRP layers, FRP types and stirrup spacing. With the same corner radius, increasing the number of FRP layers or densifying the stirrup spacing effectively improved the mechanical properties of the specimens. Finally, a database of FRP–stirrup composite−confined concrete column test results with different corner radii was established. The general calculation models were proposed, respectively, for the peak points, ultimate points and stress–strain models that are applicable to FRP−, stirrup− and FRP–stirrup−confined concrete columns with different cross−sectional shapes under axial compression.

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“…Many existing studies show that composite structures can effectively enhance the overall mechanical properties of a structure [1][2][3][4][5]. Currently, composite structures formed by the combination of steel tubes, steel spirals, fiber-reinforced polymer (FRP) and concrete are diffusely applied in civil engineering [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Performance of Circular Concrete-Filled FRP-Grooved Steel Composite Tube Columns under Axial Compression

et al. 2021

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A new structure termed “concrete-filled FRP-grooved steel composite tube (CFGCT) column” is proposed, which is composed of a stress-released steel tube (i.e., grooved steel tube), fiber-reinforced polymer (FRP) and concrete. Axial load tests were carried out on twenty-four specimens to investigate the constraint effect of this structure. Three main experimental variables were considered: the steel tube thickness, the FRP type, and the FRP layer. The failure modes, stress-strain relationships and the effect of the main experimental variables were discussed. The stress-strain curves of this new structure are composed of an initial linear part, a nonlinear transition part, a strengthening part and a residual part. The test results demonstrate that the bearing capacity of the structure was improved, and that the mechanical mechanism of the structure was simplified due to the stress-released grooves. Based on the test results and previous studies, formulas for calculating the ultimate stress (fcu), ultimate strain (εcu), peak stress (fcc) and peak strain (εcc) were proposed. In addition, models for predicting the stress-strain curves of CFGCT columns were put forward, and the models could precisely simulate the stress-strain curve of this new composite structure. Hence, this study indicates that a structure composed of FRP and stress-released steel tube can effectively constrain concrete.

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Modeling for complete stress-strain curve of circular concrete columns confined with steel spiral and FRP

Cited by 12 publications

References 61 publications

Compressive Behavior of Bamboo Sheet Twining Tube-Confined Concrete Columns

Compressive Behavior of Bamboo Sheet Twining Tube-Confined Concrete Columns

Influence of the Cross-Sectional Shape and Corner Radius on the Compressive Behaviour of Concrete Columns Confined by FRP and Stirrups

Performance of Circular Concrete-Filled FRP-Grooved Steel Composite Tube Columns under Axial Compression

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