Experimental Study of Triaxial Behavior of Concrete under Lateral Confining Stress

Javanmardi, Pouria

doi:10.2174/1874149501711010281

Cited by 3 publications

(2 citation statements)

References 15 publications

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“…Ultimately, the findings have demonstrated that stainless-steel jackets could substantially extend the plastic deformation and strengthen frames by increasing the energy absorption capacity [10]. Further, the strain hardening features of stainless steel were discerned in preventing local buckling in steel components.…”

Section: A Classification Of Confining Approaches 1) Steel Jacketingmentioning

confidence: 93%

The Structural Impact of Confinement in the Rehabilitation of Reinforced Concrete Beams

AL-Asadi¹

2019

Journal of Southwest Jiaotong University

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Confinement is shown to be effective in restoring the initial operating capacity to the damaged concrete. However,a lack of set guidelines for design and implementation prevents it from successful implementation. In this paper, we reviewed the application of confinement in the rehabilitation of damaged concrete beams. The findings illustrate that confinement could be used as a repairing technique for damaged concrete members. The simulation analysis in ANSYS 16 helped evaluate the performance of the rehabilitated beam under stress and strain. The proposed method is shown to increase structural strength and ductility in the rehabilitated concrete beam.

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Section: A Classification Of Confining Approaches 1) Steel Jacketingmentioning

confidence: 93%

The Structural Impact of Confinement in the Rehabilitation of Reinforced Concrete Beams

AL-Asadi¹

2019

Journal of Southwest Jiaotong University

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“…Su et al studied the multiaxial mechanical behaviour of foamed concrete under triaxial confining pressures [7]. Javanmardi [8] calculated the strength relationship between the lateral confining stress and uniaxial stress by summarising the experimental data of extensive and systematic multiaxial tests and compared these with the proposed relationships by other researchers [9][10][11][12][13][14][15][16]. Glatz et al developed a novel, high-temperature and high-pressure triaxial system that is suitable for X-ray computed tomography (CT) scanning to capture the role of effective stress on the fluid distribution of rocks under high triaxial pressures [17].…”

Section: Introductionmentioning

confidence: 99%

Mesoscale Modelling of Concretes Subjected to Triaxial Loadings: Mechanical Properties and Fracture Behaviour

et al. 2021

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The mechanical properties and fracture behaviour of concretes under different triaxial stress states were investigated based on a 3D mesoscale model. The quasistatic triaxial loadings, namely, compression–compression–compression (C–C–C), compression–tension–tension (C–T–T) and compression–compression–tension (C–C–T), were simulated using an implicit solver. The mesoscopic modelling with good robustness gave reliable and detailed damage evolution processes under different triaxial stress states. The lateral tensile stress significantly influenced the multiaxial mechanical behaviour of the concretes, accelerating the concrete failure. With low lateral pressures or tensile stress, axial cleavage was the main failure mode of the specimens. Furthermore, the concretes presented shear failures under medium lateral pressures. The concretes experienced a transition from brittle fracture to plastic failure under high lateral pressures. The Ottosen parameters were modified by the gradient descent method and then the failure criterion of the concretes in the principal stress space was given. The failure criterion could describe the strength characteristics of concrete materials well by being fitted with experimental data under different triaxial stress states.

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Numerical analysis of the local damage of RC beams under close‐in explosions based on the calibrated Karagozian & Case (K&C) concrete model

Xu,

Liu,

Huang

et al. 2024

Structural Concrete

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Limited research has been carried out to investigate the local damage features of reinforced concrete (RC) beams under close‐in explosions. To better capture the local damage features of rectangular cross‐sectional RC beams, a numerical study on the RC beams subjected to close‐in explosions based on the calibrated Karagozian & Case (K&C) concrete model was conducted in LSDYNA. First, a systematic calibration of the K&C model for concrete was performed in the single‐element numerical analysis. Calibration of the K&C model consists of parameter determination for the new strength surfaces, modification of the damage function to better feature the tensile behavior of concrete, elimination of the element size effect by introducing an element size factor and determination of the scaled damage factors. The new strength surfaces are verified and determined through both the approximation calculation method and the parameter fitting method. And the damage function was modified by reducing the termination of λ to better characterize the brittleness of concrete and feature the tensile failure. A comparison between the numerical results and the corresponding experimental results demonstrates that the calibrated K&C model and established FEM model of RC beams subjected to close‐in explosions can well characterize the local damage features of RC beams. On this basis, a further parameter analysis on the factors influencing the local damage response of RC beams was conducted by considering reinforcement details (stirrup spacing and longitudinal reinforcement diameter) and charge details (charge mass and aspect ratio). Results show that the close‐in explosions destroyed the concrete corners in the blast surface with shear stress first and the side shear failure of concrete corners weakens the concrete core strength and contributes to the greater loss of concrete core. Rear spalling damage was initially caused by the bond failure between the tensile longitudinal reinforcement and the surrounding concrete. Furthermore, increasing stirrup spacing, tensile longitudinal reinforcement diameter, and charge mass contribute to the increase in local damage sizes.

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Experimental Study of Triaxial Behavior of Concrete under Lateral Confining Stress

Cited by 3 publications

References 15 publications

The Structural Impact of Confinement in the Rehabilitation of Reinforced Concrete Beams

The Structural Impact of Confinement in the Rehabilitation of Reinforced Concrete Beams

Mesoscale Modelling of Concretes Subjected to Triaxial Loadings: Mechanical Properties and Fracture Behaviour

Numerical analysis of the local damage of RC beams under close‐in explosions based on the calibrated Karagozian & Case (K&C) concrete model

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