Nonlinear behavior of RC beams strengthened with strain hardening cementitious composites subjected to monotonic and cyclic loads

Khalil, Abd El-Hakim; Etman, Emad; Atta, A.A.; Essam, Mohamed

doi:10.1016/j.aej.2016.01.032

Cited by 29 publications

(17 citation statements)

References 7 publications

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“…where ε c is strain at point C, ε B is strain at point B, σ B is stress at point C, L elm is element size (mm) and G f represents the adsorbed energy after Peak. This also has been stated in the previous studies (Khalil et al , 2016; Zhang, 2012).…”

Section: Constitutive Modelsupporting

confidence: 90%

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Numerical modeling on varying patch repair size of cracked beam using engineered cementitious composites

Cahyati

Huang²,

Hsu³

2020

WJE

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Purpose This study aims to investigate the size effect of the patched repairing material applied to the cracked beam. Design/methodology/approach Numerical analysis was conducted on a simply supported cracked beam with a dimension of 200 × 25 × 15 cm using ABAQUS software. The behavior of concrete and engineered cementitious composites (ECC) in the simulation are described as concrete damage plasticity model. Linear elastic-plastic model was used to represent the behavior of rebar steel. The type of patching consisted of the varying ratio of lengths and depths, including patching length to total length ratios of 0.2, 0.3 and 0.4, and patching depth to total depth ratios of 0.2, 0.3, 0.4 and 0.5. Findings Results show that variations in the patching length and depth ratios affect the maximum flexural load, stiffness and ductility of the repaired beam. It was also found that repairing the cracked beam by using ECC provides higher flexural load of the beam than the use of conventional concrete, owing to the superior tensile strength of ECC. Originality/value ECC is the cementitious-based mortar that contains the special selected poly vinyl alcohol fiber having high tensile strength. ECC has been known to exhibit high ductility, high tensile strength and improve durability performance. Thus, ECC is suitable as repairing material for patching cracked beam. By investigating the size of the patched repairing material applied to the cracked beam, the structural performance of repairing beam and the effectiveness of the various patching size were achieved.

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Section: Constitutive Modelsupporting

confidence: 90%

“…This is because of tensile strain capacity of ECC is higher than the normal concrete. Thus, zero span tensile model is suitable to represent the tensile behavior of ECC (Khalil et al , 2016). Zero span tensile model is assumed as three-linier curve model considering fracture energy.…”

Section: Constitutive Modelmentioning

confidence: 99%

Numerical modeling on varying patch repair size of cracked beam using engineered cementitious composites

Cahyati

Huang²,

Hsu³

2020

WJE

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“…However, CDPM is able to define the damage of concrete parts surrounding re-bars. This kind of work can be seen in the study of Khalil et al (2016), Warenycia et al (2017), and Najafgholipour et al (2017). After that, a displacement control procedure was set up.…”

Section: Materials Modeling Validationmentioning

confidence: 99%

The effect of the ratio of Λ-shaped shear connectors on the flexural behavior of a reinforced concrete frame

Nguyen

Livaoğlu

2020

Advances in Structural Engineering

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Failure in a structural system can appear because of different types of pathologies and can cause a large number of problems during seismic action. Among these pathologies are design and execution flaws, underestimation of the required capacity of cross-section or seismic demand, and use of low quality of materials. The jacketing technique for a frame element is the most common use strengthening method in the practice to remove such disadvantages in a structural system. Then, the shear stress transferability at the concrete-to-concrete interface surface is the main objective. Shear connectors application is a solution for that consideration, but the investigation in the literature focusing this point is not adequate. The effect of the ratio of steel shear connectors on the interfaces of a reinforced concrete frame constructed using reinforced concrete formworks on its flexural behavior is numerically evaluated. Initially, the same ratio of Π-shaped and Λ-shaped shear connectors, 0.312%, is applied to determine the more effective shape. It should be clear that the ratio of shear connectors on any separate surface is calculated as the fraction of the total area of the cross-section of shear connectors placed perpendicularly (Π-shaped) at the surface and the area of that surface. The same ratio is understood as after evaluating the Π-shaped shear links, each of them is replaced by a Λ-shaped link at the same location. As a result, compared to the bending capacity of the frame whose surfaces are smooth, Λ-shaped connectors enhance the bending capacity of the frame up to 9.67% while the amount of improvement brought by Π-shaped ones is modest, about 2.172%. After that, a wide variety of the ratio of Λ-shaped connectors, 9 values, are placed on concrete-to-concrete interfaces. Tremendously, due to clamping stress brought by Λ-shaped shear connectors at the concrete substrates, the nonlinear behavior is improved and the amount of enhancement rises as the number of applied connectors is augmented but not linearly. The most important observation is that the amount of improvement is insignificant after the ratio of shear connectors reaches the percentage of between 0.3% and 0.4%. On the other hand, compared with the frame whose interfaces are smooth, the displacement ductility factor of the frame strengthened using 0.4% decreases an amount of about 30%.

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“…variables. Based on previous studies (Khalil, Etman, Atta, & Essam, 2016;Kupfer, Hilsdorf, & Rusch, 1969;Pereira, Campos, & Lourenço, 2015), CDP parameters were used to model the masonry and ECC sheet as they precisely account the nonlinear material behavior. It assumes that the failure of masonry and ECC can be modeled using the plasticity characteristics and response to uniaxial compression and uniaxial tension.…”

Section: Materials Modelmentioning

confidence: 99%

Out-of-plane response of ECC-strengthened masonry walls

Munjal

Singh

2020

Journal of Structural Integrity and Maintenance

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This paper focuses on the flexural behavior of masonry walls strengthened with precast engineered cementitious composite (ECC) sheet. The walls were subjected to out-of-plane static loading and analyzed using ABAQUS. For the validation of numerical results, four masonry walls of size 762 × 480 × 230 mm were cast using burnt clay bricks and cement mortar. Out of four, two masonry walls were strengthened with precast ECC sheet using epoxy as adhesive, and the remaining two acted as control specimens. The validation of numerical results with the experimental results shows that the model can effectively capture the nonlinear behavior of masonry and ECC to predict the strength and failure mechanism. The influence of mesh size on the numerical results is also reported. Further, a parametric study has been carried out to observe the effect of several parameters such as percentage of ECC reinforcement ratio, span/depth (L/d) ratio and width/thickness (b/h) ratio of the strengthened masonry walls. This study reveals that the precast ECC sheet increases the load-carrying capacity and ductility of brick masonry walls and hence demonstrates its performance as a strengthening element for brick masonry structures.

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Nonlinear behavior of RC beams strengthened with strain hardening cementitious composites subjected to monotonic and cyclic loads

Cited by 29 publications

References 7 publications

Numerical modeling on varying patch repair size of cracked beam using engineered cementitious composites

Numerical modeling on varying patch repair size of cracked beam using engineered cementitious composites

The effect of the ratio of Λ-shaped shear connectors on the flexural behavior of a reinforced concrete frame

Out-of-plane response of ECC-strengthened masonry walls

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