Compressive performance evaluation of concrete confined by stirrups at elevated temperature using DIC technology

Liu, Yanhua; Zeng, Lei; Xiang, Sheng; Mo, Jinxu; Zhang, Jicheng; Chen, Juan; Cheng, Guoyuan

doi:10.1016/j.conbuildmat.2020.119883

Cited by 19 publications

(10 citation statements)

References 36 publications

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“…The lateral restraints on concrete cylinders are uniform and continuous. The formula for calculating the coupling lateral restraint strength fl of FRP and stirrups on circular concrete columns is shown in Equation (1), in which Ag is the total section area of restrained concrete specimens (including core concrete cross-sectional area Acc, stirrup cross-sectional area As and FRP cross-sectional area Af), flf is the effective lateral restraint force of the FRP and fls is the effective lateral restraint force of the spiral stirrups. The area distribution of each component of the specimen is shown in Figure 1.…”

Section: Effective Confinement Pressurementioning

confidence: 99%

“…At present, stirrups and fibrereinforced polymers (FRPs) are two types of common binding materials in engineering. Closely spaced stirrups or spiral stirrups are often used to provide a higher lateral binding force to core concrete, but their effect of improving the concrete bearing capacity in actual engineering is still limited [1,2]. FRPs have the advantages of a light weight, high strength, good corrosion resistance and fatigue resistance.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Effective Confinement Pressurementioning

confidence: 99%

Section: Introductionmentioning

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

View full text Add to dashboard Cite

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“…The DIC technology was also used in evaluating the sensitivity of concrete to elevated and low temperatures. Thus, this method was used in [27] to monitor the propagation of cracks in concrete exposed to elevated temperatures and, in [28], in concrete exposed to low temperatures. It should be pointed out that in the research presented in [28], the 3D-DIC technology was used, and the satisfactory matching of the crack propagation paths detected by the 3D-DIC method with the actual situation was highlighted; in the research presented in [27], 2D-DIC was used, and as such, it was assessed as suitable for monitoring crack propagation.…”

Section: Introductionmentioning

confidence: 99%

Pavement Structure Characteristics and Behaviour Analysis with Digital Image Correlation

2023

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Digital image correlation (DIC) is a method of point displacement measurement by an optical system. If two cameras are used for capturing the same point displacement, three-dimensional data are obtained using the 3D-DIC method. The areas of application of this method in pavement construction are diverse, but it is mainly used for displacement monitoring during standard tests of the failure of specimens due to load application. Furthermore, DIC technology was used only for testing particular material characteristics and assuming their influence on the overall pavement system. Within this research, DIC was applied in two areas: defining material mechanical characteristics and analyses of pavement structure behaviour under cyclic loading. The scope of this research was to gain more insights into DIC’s potential application within pavement behaviour analyses, specifically on cement-bound granular material (CBGM) characterisation. Results from this study confirm the suitability of 3D-DIC technology for pavement material characterisation. Furthermore, it is shown that certain trends of material behaviour defined on the simple material level of each independent pavement layer will significantly differ when it is placed in the system, and this kind of complex analysis is possible by using 3D-DIC technology.

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“…However, from previous reports, it is known that the addition of FA to concrete has a positive effect on the parameters of fracture mechanics of 28-day and older concretes and a negative effect on the properties of composites at a young age [ 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 ]. This disadvantageous property of the material could be improved by substituting the cement binder FA in combination with SF.…”

Section: Introductionmentioning

confidence: 99%

Studies of Fracture Toughness in Concretes Containing Fly Ash and Silica Fume in the First 28 Days of Curing

Golewski

Gil

2021

Materials

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This paper presents the results of the fracture toughness of concretes containing two mineral additives. During the tests, the method of loading the specimens according to Mode I fracture was used. The research included an evaluation of mechanical parameters of concrete containing noncondensed silica fume (SF) in an amount of 10% and siliceous fly ash (FA) in the following amounts: 0%, 10% and 20%. The experiments were carried out on mature specimens, i.e., after 28 days of curing and specimens at an early age, i.e., after 3 and 7 days of curing. In the course of experiments, the effect of adding SF to the value of the critical stress intensity factor—KIcS in FA concretes in different periods of curing were evaluated. In addition, the basic strength parameters of concrete composites, i.e., compressive strength—fcm and splitting tensile strength—fctm, were measured. A novelty in the presented research is the evaluation of the fracture toughness of concretes with two mineral additives, assessed at an early age. During the tests, the structures of all composites and the nature of macroscopic crack propagation were also assessed. A modern and useful digital image correlation (DIC) technique was used to assess macroscopic cracks. Based on the conducted research, it was found the application of SF to FA concretes contributes to a significant increase in the fracture toughness of these materials at an early age. Moreover, on the basis of the obtained test results, it was found that the values of the critical stress intensity factor of analyzed concretes were convergent qualitatively with their strength parameters. It also has been demonstrated that in the first 28 days of concrete curing, the preferred solution is to replace cement with SF in the amount of 10% or to use a cement binder substitution with a combination of additives in proportions 10% SF + 10% FA. On the other hand, the composition of mineral additives in proportions 10% SF + 20% FA has a negative effect on the fracture mechanics parameters of concretes at an early age. Based on the analysis of the results of microstructural tests and the evaluation of the propagation of macroscopic cracks, it was established that along with the substitution of the cement binder with the combination of mineral additives, the composition of the cement matrix in these composites changes, which implies a different, i.e., quasi-plastic, behavior in the process of damage and destruction of the material.

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Compressive performance evaluation of concrete confined by stirrups at elevated temperature using DIC technology

Cited by 19 publications

References 36 publications

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

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

Pavement Structure Characteristics and Behaviour Analysis with Digital Image Correlation

Studies of Fracture Toughness in Concretes Containing Fly Ash and Silica Fume in the First 28 Days of Curing

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