Behavior assessment of asymmetrical building with concrete damage plasticity (CDP) under seismic load

Costa, Patrick Oliveira Batista da; Bosse, Rúbia Mara; Gidrão, Gustavo de Miranda Saleme

doi:10.3221/igf-esis.61.07

Cited by 3 publications

(3 citation statements)

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“…Multiple grades of grout [46]-specifically C15, C20, and C30alongside steel sleeves conforming to the standards of Q235 and Q345 [20] were employed in the analysis. The material specifications for the grout were derived from the concrete damaged plasticity (CDP) model and related research by Costa and Gidro [47]. The data for the clamp materials encompassed Young's modulus, yield strength, and tensile strength; for clamp Q235 [48] and Q345 [49], these parameters were 210, 334, and 480 MPa and 210, 499, and 596 MPa, respectively.…”

Section: Numerical Modeling Programmentioning

confidence: 99%

Finite Element Analysis of Corrosion Tubular T-Joint Repaired with Grouted Clamp

Deng,

Guo,

Zhu

et al. 2023

Advances in Civil Engineering

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A finite element (FE) analysis of corroded circular hollow section T-joints repaired using grouted clamps is presented in this study. To ensure an accurate simulation, experiments on a T-joint with uniform corrosion and an intact T-joint with grouted clamp are reproduced separately using an FE model. The experimental and FE modeling results correlate closely, displaying similar failure behaviors and load–displacement responses. Subsequently, a total of 56 FE T-joint models with varying degrees of corrosion on the chord, repaired by grouted clamp, were then analyzed numerically. The corrosion was artificially applied to the chord’s outer surface at depths of 10%, 20%, and 30% of the chord’s thickness. The models also account for variations in joint geometry, dictated by parameters β and γ, which range from 0.565 to 0.678 and from 21 to 28, respectively. Furthermore, grouted clamp’s properties were examined, including sleeve length, thickness, strength, as well as the thickness and strength of the grout, in relation to the complexity of the repair. The grouted clamp demonstrated significant repair capability, increasing the ultimate strength of the corroded joint by up to 2.23 times. Reinforcements that are both thicker and longer substantially enhance the joint’s ultimate strength. However, inappropriate repair construction results in an abrupt termination of the load–displacement curve and a brittle failure phenomenon outside reinforced chord region. Additional weight from the grouted clamp requires reasonable control, and sleeve overlapping ratio should be guaranteed to be greater than 0.7. The joint bearing capacity can be efficiently increased by thicker grouts and sleeves only in ductile failure cases. The confinement effect and mechanism of the grouted clamp in joint deformation were visually analyzed as stress distribution from FE analysis results. Finally, a prediction equation is proposed to estimate the static strength of the repaired joint through regression analysis.

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Section: Numerical Modeling Programmentioning

confidence: 99%

Finite Element Analysis of Corrosion Tubular T-Joint Repaired with Grouted Clamp

Deng,

Guo,

Zhu

et al. 2023

Advances in Civil Engineering

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“…In the commercial software, ABAQUS CAE®, the CDPM is conducted according to Kupfer et al [23] and Lubliner et al [24]. The software is capable of capturing the nonlinear behaviour of concrete due to a refined constitutive model of damage coupled with plasticity (see Batista da Costa et al [25]). Nguyen and Livaoğlu [26] successfully validated the model using a four-point bending test on an RC beam conducted by Perera and Huerta [27].…”

Section: Materials Selectionmentioning

confidence: 99%

Degradation of the first frequency of an RC frame with damage levels

Nguyen

Livaoğlu

2023

Frattura Ed Integrità Strutturale

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Damage in RC structures causes the degradation of stiffness and frequency parameters. In this study, the relationship between the two coefficients and damage severities is numerically investigated considering a three-dimensional (3D) reinforced concrete (RC) frame in which the concrete damage plasticity model (CDPM) and the elastoplastic model are selected to define concrete and reinforcement materials, respectively. Crack propagation of the frame is obtained utilizing a nonlinear static pushover analysis (NSPA). After the pushing procedure, according to the base shear force versus top displacement curve, the bending stiffness of the RC structure is determined rapidly. Thereafter, the degradation of the first frequency is obtained based directly on the nonlinear curve of stiffness. As a result, it is observed that the degradation of the first frequency of the RC frame is proportional to the severity of damage but not linearly. More significant damage, a more profound decrease in the modal characteristic. Particularly, the fundamental frequency of the RC frame reduces gradually until the base shear force reaches 70% of the ultimate value at which the parameter is about 60% of the counterpart at the intact stage. After that, the reduction gets more significant when the bending capacity approaches the ultimate value.

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“…Lightweight aggregate composites reinforced with fibers are an attractive material for this application. Among LECA composite constructions' many lauded qualities are their remarkable lightweight, fire resistance, and sound insulation [1][2][3][4][5][6][7][8][9][10][11][12]. Most lightweight aggregate-reinforced concrete parts are less intense than heavy ones.…”

Section: Introductionmentioning

confidence: 99%

Behavior of Reinforced Lightweight Concrete Slab with Initial Cracks

Khadim,

Abdulridha

2024

Frattura Ed Integrità Strutturale

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The flexural behavior of lightweight concrete two-way slabs repaired or strengthened with externally bonded carbon fiber-reinforced polymer (CFRP) sheets is the subject of this study. The experiment included five reinforced lightweight concrete slab specimens with dimensions of 1000 mm in length, 1000 mm in width, and 120 mm in thickness. Tested one specimen without any strengthening and reinforced another specimen with a single layer of CFRP. The other specimens were repaired with a single layer of CFRP, applying damage ratios of 50%, 60%, or 70% of the ultimate load. Intentionally designed each slab to collapse under bending forces and maintained comparable dimensions. According to the experiment results, changing the degree of damage from 70% to 50% increases the ultimate load capacity by about 17.7%, and the ultimate deflection decreases by about 31.4%. CFRPs have the potential to fix structural damage under static stress testing conditions. However, it is essential to make sure that they stick well to surfaces that do not have suitable geometric properties or have been deformed. CFRP sheets effectively repaired the specimens, increasing the failure stress of the reinforced concrete slabs and preventing the spread of cracks.

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Behavior assessment of asymmetrical building with concrete damage plasticity (CDP) under seismic load

Cited by 3 publications

References 0 publications

Finite Element Analysis of Corrosion Tubular T-Joint Repaired with Grouted Clamp

Finite Element Analysis of Corrosion Tubular T-Joint Repaired with Grouted Clamp

Degradation of the first frequency of an RC frame with damage levels

Behavior of Reinforced Lightweight Concrete Slab with Initial Cracks

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