Creep of compression fly ash concrete-filled steel tubular members

Han, Bing; Jiao, Yu-Ying; Xie, Huibing; Zhu, Li

doi:10.1016/j.tws.2017.01.034

Cited by 8 publications

(4 citation statements)

References 15 publications

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“…The three-parameter model is an appropriate model for describing the viscoelastic nature of many solids [13] and is often used to study the phenomenon in various scientific fields. Adaptation of the Burgers model in different fields of structural analysis can be found in [14][15][16][17][18][19]. The total deformations of the Kelvin-Voigt model are given by ε = ε e + ε v , where ε e is the deformation of the elastic model and ε v is the deformation of the Kelvin-Voigt model.…”

Section: Solution Of the Three-parameter Rheological Modelmentioning

confidence: 99%

Using Dynamic Analysis to Adjust the Rheological Model of Three Parameters to the Eurocode Creep Criteria

Wahrhaftig¹

2020

Dynamical Systems Theory

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A dynamic analysis of vibration for considering a three-parameter rheological model to fit the same results as predicted for creep by the Eurocode (EN 1992) criteria is performed based on the adjustment of its parameters. The use of a rheological model of three parameters as a valid alternative for real problems brings a huge facility for mathematical implementation and manipulation due the simplicity of the solution. For adjustment of the elastics and the viscous parameters, a numerical simulation to calculate the fundamental frequency of an actual reinforcement concrete pole is carried out in comparison with the standard Eurocode criteria. In this determination, the geometry variation, a concentrated force present at the free end of the structural element, and the self-weight of the structure are considered. The physical nonlinearity of the concrete due to the cracks is also considered by reducing of the flexural stiffness, and its viscoelastic behavior is included in the calculation through a temporal modulus of elasticity. In the analysis, the ground was modeled as a set of distributed springs along the foundation length. The frequency over time is then analytically calculated as the critical buckling load for different instants after the structure to be loaded.

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Section: Solution Of the Three-parameter Rheological Modelmentioning

confidence: 99%

Using Dynamic Analysis to Adjust the Rheological Model of Three Parameters to the Eurocode Creep Criteria

Wahrhaftig¹

2020

Dynamical Systems Theory

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“…Hamed and Bradford (2010) performed a similar analysis in their mathematical investigation of creep in RC beams strengthened with fiber-reinforced polymers. Han et al (2017a) experimentally investigated creep in a concrete-filled steel tube. In addition, Irfan-ul-Hassan et al (2016) established the relationship between the modulus of elasticity and time and quantified the Young's modulus by performing an experimental examination of cylindrical specimens.…”

Section: Overviewmentioning

confidence: 99%

Analytical determination of the vibration frequencies and buckling loads of slender reinforced concrete towers

Wahrhaftig

Silva

Brasil

2019

Lat. Am. j. solids struct.

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This study focused on improving the design of slender structures with reinforced concrete (RC) telecommunication towers as the main application. Analytical procedure based on Rayleigh's method to compute the first natural vibration frequency and the critical buckling load was development. All the nonlinearities present in the system were considered, in addition to the soil-structure interaction and the variation of the geometric properties along the length of the structure. The geometric nonlinearity and imperfections of the tower structure were computed as functions of the axial load using a geometric stiffness matrix. Further, the material nonlinearity was accounted for by reducing the flexural stiffness. As concrete structures exhibit viscoelasticity, creep was calculated using the Eurocode 2 model. The soilstructure interaction was modeled as a set of distributed springs. To validate the proposed method, the first frequency and critical buckling load were compared with those yielded by FEM simulations. The frequency results were in good agreement with those of the FEM simulations, indicating that the proposed method is sufficiently accurate for use in engineering design applications and easy to implement. On the other hand, the buckling load results obtained using the proposed method and FEM differed significantly, motivating further investigation.

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“…The results show that the creep effect has a considerable influence on the static response of CFST even if loads were applied at a very great age, while the shrinkage in the concrete core has a quite limited impact on the overall deformation of CFST. Han et al (2017) established a linear compressive stress–strain relationship of fly ash concrete-filled steel tubes (FACST) and introduced the equations of creep prediction of FACST. In these literatures, the principle of superposition was used in their methods by treating the stress decrease as stress increase with a negative sign.…”

Section: Introductionmentioning

confidence: 99%

Creep of concrete-filled steel tube considering creep-recovery of the concrete core

Mei

Wang

Zou

et al. 2019

Advances in Structural Engineering

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Concrete creep results in the strain increment of concrete-filled steel tube. In this article, a new method was established for creep prediction of concrete-filled steel tube considering the creep-recovery effect of the concrete core with creep model and separate creep-recovery model, named two-function method. Five creep models including the recent proposed B4 model and two separate creep-recovery models were used in the method. First, the creep models were compared with 197 test curves of creep of sealed concrete. The results show that the B4 model offers the highest prediction accuracy for load duration time longer than 200 days. Then, the two-function method was used for creep prediction of normal strength concrete-filled steel tube and high-strength concrete-filled steel tube. For comparison, the creep prediction method for concrete-filled steel tube based on the principle of superposition was also adopted. The principle of superposition did not predict the creep of concrete-filled steel tube accurately. The calculation results based on the two-function method are closer to the test data, especially for normal strength concrete-filled steel tube. Finally, the uncertainty of creep in concrete-filled steel tube was analyzed considering the variability of the concrete strength. The results indicate that the variances calculated by the methods with the MC 2010 creep model are smaller than that of the B4 model. The creep strains of concrete-filled steel tube calculated by the two-function method are subject to normal distribution.

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Creep of compression fly ash concrete-filled steel tubular members

Cited by 8 publications

References 15 publications

Using Dynamic Analysis to Adjust the Rheological Model of Three Parameters to the Eurocode Creep Criteria

Using Dynamic Analysis to Adjust the Rheological Model of Three Parameters to the Eurocode Creep Criteria

Analytical determination of the vibration frequencies and buckling loads of slender reinforced concrete towers

Creep of concrete-filled steel tube considering creep-recovery of the concrete core

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