Impact of Dilation Angle and Viscosity on the Ultra-High Performance Concrete Behavior in Abaqus

Jabbar, Adil M.; Hamood, Mohammed J.; Mohammed, Dhiyaa H.

doi:10.1109/icasea53739.2021.9733087

Cited by 3 publications

(5 citation statements)

References 18 publications

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“…The interaction between steel plates and concrete is chosen as a surface-to-surface contact in an initial step. Two contact properties are selected; tangential behavior with a friction coefficient of 0.45 and normal behavior with hard contact to prohibit the penetration between the two surfaces [17]. The analysis is performed using a static general step of loading.…”

Section: 2numerical Simulation Of Columnsmentioning

confidence: 99%

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Numerical Analysis of Sectional Shape Effect on Behavior of Short Concrete Columns

Mahdi Jabbar,

Salim Danha,

Abdulmajeed Hasan

2024

ejuow

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This paper numerically investigates the effect of sectional shape on the structural behavior of short concrete columns when subjected to axial loading. Seven concrete columns that possess the same cross-sectional area, longitudinal reinforcement ratio, tie-bar diameter, and spacing are analysed via Abaqus software. The concrete compressive strength is equal for all columns. The loading is applied at the plastic centroid of the cross-section. The results show that the plus-shaped cross-sectional column sustains the highest load, while the T-shaped section bears the lowest loading. The plus-shaped, square, rectangular, and circular columns endure a higher loading than the T-shaped ones by 12.3 %, 10.7 %, 10.7 %, and 8.7 %, respectively. Concerning the longitudinal displacement, the T-shaped column exhibits the highest shortening, while the octagonal section shows the minimum shortening. Failure of all columns occurs due to the yielding of the longitudinal bars, followed by a fracturing of the concrete. All columns roughly show the same cracking load, while the T-shaped section exhibits a higher displacement than others at the cracking state, followed by an L-shaped column. However, all other columns show the same longitudinal displacement at the cracking load.

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Section: 2numerical Simulation Of Columnsmentioning

confidence: 99%

“…The elastic behavior is simulated by the elastic modulus and Poisson's ratio. The concrete Damage Plasticity (CDP) model is applied to define the plastic behavior of concrete after cracking [17], [18]. Hognestad formula is adopted to explain the stress-strain relationship of concrete in compression, as shown in Figure 3.…”

Section: 3concrete Materials Modellingmentioning

confidence: 99%

Numerical Analysis of Sectional Shape Effect on Behavior of Short Concrete Columns

Mahdi Jabbar,

Salim Danha,

Abdulmajeed Hasan

2024

ejuow

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“…Therefore, this parameter depends on representing the material properties in compression and tension. When the viscosity raises, the regression portion, which describes the softening in compression strain, becomes shallower than the softening when viscosity decreases [26]. Four values are adopted in this study to clarify their effect on the beam behavior.…”

Section: The Viscosity Parameter (μ)mentioning

confidence: 99%

Impact of Failure-surface Parameters of Concrete Damage Plasticity Model on the Behavior of Reinforced Ultra-high Performance Concrete Beams

Mahdi

2023

Period. Polytech. Civil Eng.

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The failure surface of elements can numerically represent by a concrete damage plasticity (CDP) model in Abaqus software which depends on five parameters. The parameters are eccentricity, shape, biaxial to uniaxial compressive strength ratio, dilation angle, and viscosity. This paper studies the effect of changing the values of the failure surface parameters on the bearing capacity, deflection, and overall structural behavior of ultra-high performance concrete (UHPC) beams. The parameters' changes include reasonable values higher or lower than the values adopted by Abaqus. An experimentally performed reinforced UHPC beam is simulated by Abaqus, and the five parameters are calibrated to coincide with the practical results. Then, one of the parameters is changed while others remain constant for each alteration to study its effect on the UHPC beam behavior. The numerical analysis results show that all five parameters do not affect the loading capacity and the corresponding deflection at the first cracking state. At peak state, the eccentricity does not affect the load and deflection. The influence of shape and the biaxial to uniaxial compressive strength ratio are confined to the deflection at peak load only without affecting the bearing capacity. The dilation angle effect appears when it is greater than 30 degrees to 56 degrees, while when it is less than 30, it does not affect the load and deflection. Rising the dilation angle and viscosity value promotes the peak load and the deflection.

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“…Element failure surface can describe by five parameters via the CDP model. These parameters rely on several theories and hypotheses forged to represent the concrete behavior upon loading until failure [16], [18], [25], [26], [27], [28]. The fracture surface of the element is a modified Drucker-Prager's strength hypothesis where the yield surface is not a circle in the case of plane stress, but it deviates inward [24], [26], [29], as shown in Fig.…”

Section: Definition Of a Failure Surface In The Cdp Modelmentioning

confidence: 99%

“…stiffening technique of the material. The viscosity parameter describes the concrete behavior when it alters from non cracked to cracked material [18], [28], [32]. This parameter is calibrated in this study.…”

Section: -Numerical Simulation Of Ultra-high-performance Concrete's C...mentioning

confidence: 99%

Numerical simulation of ultra-high-performance concrete's compressive and tensile behaviour in beams

Jabbar¹,

Danha²,

Hasan³

2023

J Appl Eng Science

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Ultra-high-performance concrete (UHPC) differs in its structural behavior from conventional concrete due to its high compressive and tensile strength, stiffness, toughness, and durability. Therefore, UHPC needs an appropriate constitutive model to simulate its mechanical properties in finite element analysis. In this study, numerical models were developed to trace the structural behavior of UHPC beams upon loading since beam behavior depends on the constituents' response to compression and tension. New numerical models were formulated to display the stress-strain relationships of UHPC in compression and tension by adopting a new methodology that depended on actual results. The compressive stress-strain relationship included two portions; the ascending one for elastic and strain hardening up to compressive strength and a descending curve for the strain-softening until a 0.0062 strain. A linear elastic tensile stress-strain relation was applied until tensile strength. A tri-linear relationship was applied for stiffness degradation and crack propagation upon debonding fibers from the matrix until fracture. These numerical models were used in Abaqus software to simulate the UHPC beam behavior. The developed models were verified and proved for beams' behavior in flexure and shear. The results indicated that the models could predict UHPC beams' response throughout the entire loading until failure.

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Impact of Dilation Angle and Viscosity on the Ultra-High Performance Concrete Behavior in Abaqus

Cited by 3 publications

References 18 publications

Numerical Analysis of Sectional Shape Effect on Behavior of Short Concrete Columns

Numerical Analysis of Sectional Shape Effect on Behavior of Short Concrete Columns

Impact of Failure-surface Parameters of Concrete Damage Plasticity Model on the Behavior of Reinforced Ultra-high Performance Concrete Beams

Numerical simulation of ultra-high-performance concrete's compressive and tensile behaviour in beams

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