Compressive behavior of concrete filled steel tubular columns subjected to long-term loading

Zhang, Dian Jie; Shuo, Yi; Wang, Yuanfeng

doi:10.1016/j.tws.2014.12.020

Cited by 24 publications

(4 citation statements)

References 20 publications

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“…They found the creep strain of CFT specimens to be significantly lower than that for unconfined concrete. Similar dimensions of specimens were tested by Ma [ 7 ] and D. J. Zhang et al [ 8 ], who measured the creep and stress–strain relationships of the CFT. R. Zhang et al [ 9 ] studied the creep behavior of CFT with various contents of expansive agent and indicated that the creep coefficient of the concrete structure increases with a reduction in the amount of expansive additives.…”

Section: Introductionmentioning

confidence: 99%

Long-Term Creep and Shrinkage Behavior of Concrete-Filled Steel Tube

2021

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A concrete-filled steel tube (CFT) combines the advantages of concrete and steel in construction and structural applications. However, research on the time-dependent deformation of the CFT under long-term sustained loading are still limited, particularly for stress transfer between the steel tube and concrete due to creep. This study investigated the creep behavior of CFT over a long period of 400 days. The creep and shrinkage strain of CFT was significantly lower than those of concrete that was not confined within a steel tube. The vertical strains of the steel tube and concrete core were almost identical, and it was shown that they were well bonded and acted as a composite. The vertical stress of steel increased by 32.7%, whereas the vertical stress of concrete decreased by 15.8% at 375 days. The stress transfer is notable and cannot be neglected in CFT design. Moreover, the results of creep and shrinkage were compared to prediction values of the B4 model and B4-TW model to verify their validity.

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Section: Introductionmentioning

confidence: 99%

Long-Term Creep and Shrinkage Behavior of Concrete-Filled Steel Tube

2021

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“…Zhong [1] proposes an empirical equation for calculating the creep deformation of axial compression for short columns. Han [24] performed a theoretical analysis of the creep characteristics of a CFST’s axial compression with the age-adjusted effective modulus of elasticity method. Chen [25] conducted experiments on 22 specimens of CFST short columns to study the effects of the recycled coarse aggregate replacement rate and the ferrule index on bearing behavior and deformation performance.…”

Section: Introductionmentioning

confidence: 99%

Experimental Studies on the Effect of Properties and Micro-Structure on the Creep of Concrete-Filled Steel Tubes

Zhang

Wang

et al. 2019

Materials

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To study different lateral restraints, different constituents of expansion agents, the influence of different steel ratios, and concrete creep properties, we carried out experiments with lateral restraint and without lateral restraint conditions separately on 12 specimens with the expansion agent content accounting for 4%, 8%, and 12% respectively. In addition, the creep tests were performed on specimens with different steel ratios of 0.0%, 3.8%, 6.6%, and 9.2%. The test results show that the lateral restraint improves the strength of the system (concrete-filled steel tubes) which resists further load after the concrete ultimate strength is surpassed and reduces the creep. The creep degree of the concrete-filled steel tube with lateral restraint is about 0.09–0.30 times smaller than that of the tube without lateral restraints. The creep degree of the concrete-filled steel tube increases as the steel ratio decreases. Creep tests with different amounts of expansion agent indicate that the creep degree of the concrete structure increases as expansion agent content decreases. To study the internal mechanism of the creep of concrete-filled steel tubes with different lateral restraints and different expansion agent concentrations, a microscopic pore structure test on the steel core concrete was conducted using the RapidAir457 pore structure instrument. Microscopic studies show that the air content and the length of the bubble chord of the laterally restrained core concrete are lower than those without lateral restraint core concrete. The amount of air content and the length of the bubble chord of core concrete specimens increase as the expansion agent content in the core concrete specimens decreases from 12% to 4%. Under the same external loading conditions, as steel ratio increases, the lateral restraint causes a further reduction of creep. The results of this study suggest that the creep of concrete can be reduced by selecting appropriate lateral restraint conditions and an optimal amount of expansion agent in the mix design of concrete for concrete-filled steel tubes.

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“…In recent years, several researchers have used the Drucker-Prager model to simulate the behavior of concrete confined by FRP or steel tubes. Dian et al [5] used the D-P plasticity model to simulate the behavior of a filled steel tube subjected to long term loading. The numerical results matched well with the experimental results.…”

Section: Introductionmentioning

confidence: 99%

Parameters estimation of Drucker-Prager plasticity criteria for steel confined circular concrete columns in compression

Al-Kutti

2018

MATEC Web Conf.

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Abstract. This paper explores the possibility to use Drucker-Prager model in Steel-Concrete composite section. Numerical simulation was conducted using finite element package to simulate the steel-concrete composite section subjected to uniaxial compressive loading. After calibration with experimental study, parametric study was conducted to evaluate the effect of the friction angle and the cohesion constant c on the stress-strain curve of composite section. Empirical relationship between the friction angle and the confined concrete compressive strength was developed and a range of cohesion constant c between 5-10 MPa was suggested for confined concrete strength range of 25 to 100 MPa, respectively.

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Compressive behavior of concrete filled steel tubular columns subjected to long-term loading

Cited by 24 publications

References 20 publications

Long-Term Creep and Shrinkage Behavior of Concrete-Filled Steel Tube

Long-Term Creep and Shrinkage Behavior of Concrete-Filled Steel Tube

Experimental Studies on the Effect of Properties and Micro-Structure on the Creep of Concrete-Filled Steel Tubes

Parameters estimation of Drucker-Prager plasticity criteria for steel confined circular concrete columns in compression

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