Behavior of square and rectangular ultra high-strength concrete-filled FRP tubes under axial compression

Ozbakkaloglu, Togay

doi:10.1016/j.compositesb.2013.05.007

Cited by 141 publications

(59 citation statements)

References 41 publications

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“…Experimental studies also indicate that with rounded corners, the FRP wraps have better confinement effect on the rectangular concrete columns [1,16,17]. Furthermore, it is found that better confinement can be achieved by enlarging the radius of the rounded corners [1,11,16,17].…”

Section: Introductionmentioning

confidence: 80%

Finite element analysis of axially loaded FRP-confined rectangular concrete columns

Kwan

Ouyang

et al. 2015

Engineering Structures

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Section: Introductionmentioning

confidence: 80%

Finite element analysis of axially loaded FRP-confined rectangular concrete columns

Kwan

Ouyang

et al. 2015

Engineering Structures

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“…At present, the axial compression bearing capacity calculation methods of normal CFST which considered the confining effect include two types: unified strength theory and limit analysis theory calculation method. For example, the Chinese specifications were CECS28: 2012 and JTDG/T D65-60; see (2) and (3) respectively. The two calculation methods were used to calculate the compression bearing capacity of the tested specimens and then compared with the test results.…”

Section: Calculation Methods Of Axial Bearing Capacitymentioning

confidence: 99%

“…CFST has been widely used in the civil engineering due to its high capacity, good plasticity, excellent seismic resistance, and convenient construction properties. There are also some other kinds of composite materials, such as the double-skin FRP-HSC-steel columns (DSTCs) [1][2][3] and concrete filled FRP tubes (CFFTs) [4]. However, many steel tubes in current projects were mainly filled with the ordinary concrete [5][6][7], but with the development of ultrahigh strength concrete (UHSC), the ultrahigh strength concrete filled steel tube (UHSCFST) with core concrete strength exceeding C80 has been gradually applied in the civil engineering.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Ultrahigh Strength Concrete Filled Steel Tube Short Columns under Axial Load

Zhou

Mou

Tang

et al. 2017

Advances in Materials Science and Engineering

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Based on the project of Modaoxi Bridge, an experimental study on the compressive behavior of ultrahigh strength concrete filled steel tube (UHSCFST) short column was conducted. A total of 9 UHSCFST specimens were tested, and the cube strength ( cu ) of the core concrete reached 115.4 MPa. Main parameters were the confining factor ( = 0.608, 0.919, and 1.015), steel ratio ( = 14.67%, 20.02%, and 21.98%), and steel strength ( = 349 MPa, 352 MPa, and 427 MPa). The axially loading test results showed that the visible damage of steel tube occurred under the ultimate load. The higher the confining effect, the less the damage features. And all specimens basically presented a drum-type failure mode. The confining effect of steel tube effectively changed the brittle failure mode of ultrahigh strength concrete (UHSC) and tremendously improved the load bearing capacity and ductility of specimens. Moreover, the higher the steel ratio and steel strength of the specimens, the stronger the confining effect. Meanwhile the excellent mechanical properties will be obtained. Also it is recommended that the UHSCFST prefers Q345 or above strength steel tube to ensure sufficient ductility, and the steel ratio should be more than 20%. Furthermore, the confining effect of steel tubes can improve the ultimate bearing capacity of the ultrahigh strength CFST short columns.

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“…Ozbakkaloglu [12] conducted a research on the behavior of square and rectangular Ultra-High Strength Concrete-Filled FRP Tube (UHSCFFT) columns under axial compression. It was revealed that su ciently con ned square and rectangular columns could exhibit a compressive behavior with high ductility.…”

Section: Introductionmentioning

confidence: 99%

Seismic Response Evaluation of Reinforced High Strength Concrete Columns based on the Modified Constitutive Model

2017

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KEYWORDSHigh strength concrete; Seismic assessment; Modi ed strength model; Cyclic loading; Second order force e ect; Reinforcement ratio.Abstract. The current study deals with strength and seismic ductility assessment of reinforced High-Strength Concrete (HSC) columns. We have studied the nonlinear response of HSC columns with various reinforcement and axial force ratios subjected to cyclic loading. The study consists of primary veri cation of mathematical nonlinear model and further calibration to ensure the required accuracy. The existing experimental work is assumed as veri cation pilot that consists of four columns. Column members di er in the strength and axial force. Concrete has 63.1 MPa mean strength and 0.3% crushing strain. The longitudinal and transverse reinforcements are based on ACI 318 regulations in experiment. We have used the nonlinear ber-element code in OpenSees environment for the modeling and analysis of models. The existing proposed stress-strain curve is modi ed to ensure the validity of assessment. Calibration procedure has led to conclusion that the post-yield slope needs to be modi ed in HSC model as the average value of ACI 363 reference. We have developed twelve extra models to estimate the interaction of concrete strength, rebar ratio, and axial force e ect on the seismic performance. Parametric study of calibrated models reveals that the seismic energy dissipation in HSC members is the function of the provided longitudinal reinforcement ratio and lateral con ning stirrup amount.

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Behavior of square and rectangular ultra high-strength concrete-filled FRP tubes under axial compression

Cited by 141 publications

References 41 publications

Finite element analysis of axially loaded FRP-confined rectangular concrete columns

Finite element analysis of axially loaded FRP-confined rectangular concrete columns

Experimental Study on Ultrahigh Strength Concrete Filled Steel Tube Short Columns under Axial Load

Seismic Response Evaluation of Reinforced High Strength Concrete Columns based on the Modified Constitutive Model

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