Development of CSMM-based shell element for reinforced concrete structures

Luu, C. H.; Mo, Y. L.; Hsu, Thomas T. C.

doi:10.1016/j.engstruct.2016.11.064

Cited by 45 publications

(17 citation statements)

References 18 publications

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“…It also redistributes the internal force of static and statically indeterminate structures, resulting in excessive structural deformation, a significant reduction in overall strength, and even a loss of bearing capacity. With the current wide range, high quality, and general use of concrete materials, concrete creep has become one of the major problems that threatens concrete structural development and the safety of concrete construction and long-term stability [2,3].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Creep Damage Constitutive Model of Concrete Based on Fractional Calculus Theory

Zhang

Zhu

et al. 2019

Materials

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Concrete creep has become one of the major problems that threatens concrete structural development and construction. However, a reasonable and accurate calculation model for numerical analysis is the key to control and solve the creep deformation of concrete. To better describe the concrete nonlinear creep damage evolution rule, the visco-elasticity Plasticity Rheological Theory, Riemann Liouville Theory and Combined Model Theory are quoted, and the Able dashpot is used to reconstruct fractional-order soft-body composite elements to propose the expression of the stress-strain relationship of the elastomer, visco-elasticity plasticity body, and Viscoplasticity body, considering the evolution of the concrete compression damage process. A nonlinear creep damage constitutive model of concrete, based on fractional calculus theory, is conducted, and the parameters of the specific calculation method of the model are given. The influence of stress level σ, fractional order n and material parameter α on the concrete creep process is determined by a sensitivity analysis of the model parameters. The creep process and deformation amount of concrete in practical engineering can be effectively controlled by the results of the proposed sensitivity analysis. The research results can be used to provide guidance and reference for the safe construction of concrete engineering in actual practice.

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Section: Introductionmentioning

confidence: 99%

Nonlinear Creep Damage Constitutive Model of Concrete Based on Fractional Calculus Theory

Zhang

Zhu

et al. 2019

Materials

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“…As presented in previous research (Luu et al, 2017), the demarcation point of ε sy in equation (1) should be substituted by 0.002, which gives…”

Section: Basic Equations Of the Smmt For Pc Composite Bgcswsmentioning

confidence: 99%

“…As presented in previous research (Luu et al, 2017), the demarcation point of e sy in equation 1should be substituted by 0.002, which gives n 12 ð Þ torsion = 0:16 + 680e sf for e sf ł 0:002 ð2aÞ n 12 ð Þ torsion = 1:52 for e sf .0:002 ð2bÞ…”

Section: Hsu/zhu Ratios For Torsionmentioning

confidence: 99%

A softened membrane model for prestressed concrete composite box girders with corrugated steel webs under pure torsion

Shen

Wan

et al. 2018

Advances in Structural Engineering

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Torsion can be regarded as a principal factor in some cases, such as in curved girders and eccentrically loaded girders, when conducting the structural analysis of prestressed concrete composite box girders with corrugated steel webs. Recently, a rational model, called the softened membrane model for torsion, was proposed for the torsional analysis of reinforced concrete members; thereafter, this model was extended to prestressed concrete members under pure torsion and called softened membrane model for torsion prestressed concrete. This article presents a modified model, the softened membrane model for torsion prestressed concrete for prestressed concrete composite box girders with corrugated steel webs, to analyze full torsional behavior. To build the model, the softened membrane model for torsion in reinforced concrete members is first extended to perform the torsional analysis of prestressed concrete composite box girders with corrugated steel webs by incorporating the torsional contribution of corrugated steel webs. Afterward, the initial stresses and strains due to prestressing are considered to extend the softened membrane model for torsion to softened membrane model for torsion prestressed concrete for prestressed concrete composite box girders with corrugated steel webs by modifying the equilibrium equations, convergence criteria, and constitutive laws of materials. The modified model is validated by experimental data and is proven to be capable of predicting the overall torque–twist curve, especially the precracked branch and postcracked ascending branch. In addition, a comparison between the softened membrane model for torsion and softened membrane model for torsion prestressed concrete indicates that the torque values before and after concrete cracking will be overestimated and underestimated, respectively, without considering the effect of the initial stresses and strains. Finally, another comparison shows that the softened membrane model for torsion prestressed concrete is superior to the rotating-angle truss model for torsion in its ability to predict the precracked branch of the torque–twist curve.

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“…Extensive studies has now been carried out to lucidly explain the mechanism of shear failure, which has formed several well-established theories. The studies are regarding the 45-degree truss analogy [7], the variable truss method [8], the strut-and-tie model [9] and more advanced concepts such as the modified compression field, the disturbed stress field, and the softened truss and the compressive force path method [10][11][12][13]. Some of these theories have now been adopted by the currently available design specifications, although many of them still rely on empirical equations which were based on regression analysis of experimental results with different test parameters.…”

Section: Introductionmentioning

confidence: 99%

Visualization of Shear Cracks in a Reinforced Concrete Beam using the Digital Image Correlation

Tambusay¹,

Suryanto²,

Suprobo³

2018

International Journal on Advanced Science, Engineering and Information Technology

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A low-cost digital image correlation system is used to visualize the formation and propagation of concrete cracking in a reinforced concrete beam. The system employed comprises an ordinary digital camera, a remote image recording controller (a smartphone) and a freely-available, open-source image correlation software package Ncorr. In this paper, the application of this system is demonstrated to obtain a comprehensive time-lapse of longitudinal strain fields developing before and after the onset of shear cracking, thus allowing one to appreciate the mechanisms of shear failure in the beam fully. It is shown that the longitudinal strain fields obtained from the DIC system are in a good agreement with hand-drawn crack maps and that obtained from nonlinear finite element analysis.

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Development of CSMM-based shell element for reinforced concrete structures

Cited by 45 publications

References 18 publications

Nonlinear Creep Damage Constitutive Model of Concrete Based on Fractional Calculus Theory

Nonlinear Creep Damage Constitutive Model of Concrete Based on Fractional Calculus Theory

A softened membrane model for prestressed concrete composite box girders with corrugated steel webs under pure torsion

Visualization of Shear Cracks in a Reinforced Concrete Beam using the Digital Image Correlation

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