Flexural Strengthening of Prestressed Girders with Partially Damaged Strands Using Enhancement of Carbon Fiber Laminates by End Sheet Anchorages

Abbas, Hayder Qays; Al-Zuhairi, Alaa Hussein

doi:10.48084/etasr.5007

Cited by 11 publications

(7 citation statements)

References 14 publications

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“…The numerical analysis results were in accordance with the test results of [14]. The flexural strength of a concrete girder enhanced by external structural materials due to prior damage was studied in [15]. A bridge may fail due to the action of terrorist attacks such as explosives, so it is needed to make the bridge gliders strong enough [16], something that damages the concrete girders [17].…”

Section: Introductionsupporting

confidence: 54%

Effect of Double Interior Stiffeners on the Flexural Behavior of Concrete Filled Steel Tube Composite Box Girders

Abedi,

Rasheed

2023

Eng. Technol. Appl. Sci. Res.

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A composite box girder is a type of structural element that possesses strong torsional stiffness and resistance against flexural forces. A new category of bridge structure has been established: one that consists of concrete-filled steel tubes connected to composite slabs by steel trusses. In this study, an experimental and computational analysis of flexural loadings on four different types of composite box girders that are connected to concrete-filled steel tubes is presented. The specimens in this test are subjected to a concentrated load at the span's midpoint. The first model is a concrete-filled tube with no internal stiffeners and is used as a control specimen. The second model is a concrete-filled tube with double internal I-shaped stiffeners welded inside a steel tube. The third model features double T-shaped stiffeners, and the fourth model features stiffeners in the shape of a V. When compared with the control specimen, the results of the tests demonstrated that the Concrete-Filled Steel Tube (CFST) section equipped with internal stiffeners provided a better strength capacity and exhibited less deflection. The I- and the V-shaped stiffeners were found to be inferior to the T-shaped. The findings of the numerical analysis were in accordance with the results of the test.

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Section: Introductionsupporting

confidence: 54%

Effect of Double Interior Stiffeners on the Flexural Behavior of Concrete Filled Steel Tube Composite Box Girders

Abedi,

Rasheed

2023

Eng. Technol. Appl. Sci. Res.

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“…In an effort to better understand the effects of the impactor head geometry upon low velocity impact, a three-dimensional finite element model was developed and linked to a VUMAT subroutine to simulate the impact response of the T700/Epoxy composite laminates when struck by the two suggested impactors. Based on the results of these studies, the following conclusions can be made [29]:…”

Section: Discussionmentioning

confidence: 94%

Bridging the Effect of the Impactor Head Shape to the Induced Damage during Impact at Low Velocity for Composite Laminates

RABOUH

GUERRAİCHE

Zouggar

et al. 2023

Eng. Technol. Appl. Sci. Res.

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The present paper presents an investigation and analysis study of the effect of the head shapes of the impactor on the damages observed during low-velocity impact on T700/Epoxy composite laminate. Two types of impactors were investigated: hemispherical and flat-face. A new criterion based on the LARC05 damage model was linked as a LARC_VUMAT subroutine to simulate the impact and explore the effects of the head form shape through a three-dimensional finite element model. To properly analyze the problem, the history time of the mechanical responses, such as impact forces, bending, principal, and residual stresses, are highlighted and assessed. Additionally, a comparison with the experimental data found in the literature was performed to check the validity and accuracy of the considered finite element model. The damage occurring in the T700/Epoxy plates is illustrated for each impactor head shape. The mechanical response curves and all kinds of damage of the presented simulations are in perfect agreement with the experiments. The proposed VUMAT is efficient in the prediction of fiber kinking, matrix cracking, fiber splitting, and fiber tension of a laminate, and more importantly, it is easy to implement for other types of materials and the reproducibility of the analysis is assured.

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“…However, cross-line bridges are often struck by vehicles to varying degrees [ 2 ], which will cause cracks in the girder body and even damage to the steel bars, concrete and post-tensioned strands [ 3 , 4 , 5 ]; as a result, their flexural capacity does not meet the design load specified in the current design specification [ 6 ]. To reduce the effects of traffic on in-service bridges after they undergo collisions, and prevent large areas of traffic paralysis, there is a need for new methods to repair and strengthen or demolish and reconstruct bridges [ 7 ]. Demolition and reconstruction require very large financial input and cause severe environmental pollution.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study of the Ultimate Flexural Capacity of a Full-Size Damaged Prestressed Concrete Box Girder Strengthened with Bonded Steel Plates

Liu

2023

Materials

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Using steel plates attached with epoxy resin adhesive to strengthen prestressed reinforced concrete bridges has become a common method to increase bearing capacity in engineering because of the simple technology, low cost and good strengthening effects. The strengthening method of steel plates has been gradually applied to repair damaged bridges in practical engineering. After a cross-line box girder bridge was struck by a vehicle, the steel bars and concrete of a damaged girder were repaired and strengthened by steel plates, and then the ultimate bending bearing capacity was studied through a destructive test. The results of the destructive test were compared with those of an undamaged girder to verify the effect of the repair and strengthening of the damaged girder. The results showed that the actual flexural bearing capacity of the repaired girder strengthened by steel plates was 1.63 times the theoretical bearing capacity, 36.7% more than that of the damaged girder and 95.3% of that of an undamaged girder. The flexural cracking moment of the repaired girder strengthened by steel plates reached 66.3% of that of the undamaged girder. The maximum crack width decreased by 24.6%, and the maximum deflection increased by 2.7%, compared with the undamaged girder when the repaired girder strengthened by steel plates finally failed. Moreover, this method of attaching steel plates can increase the ductility of bridges and reduce the degree of cracking. Additionally, the actual safety factor of the repaired girder was greater than three, and it had a large safety reserve.

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Flexural Strengthening of Prestressed Girders with Partially Damaged Strands Using Enhancement of Carbon Fiber Laminates by End Sheet Anchorages

Cited by 11 publications

References 14 publications

Effect of Double Interior Stiffeners on the Flexural Behavior of Concrete Filled Steel Tube Composite Box Girders

Effect of Double Interior Stiffeners on the Flexural Behavior of Concrete Filled Steel Tube Composite Box Girders

Bridging the Effect of the Impactor Head Shape to the Induced Damage during Impact at Low Velocity for Composite Laminates

Experimental and Numerical Study of the Ultimate Flexural Capacity of a Full-Size Damaged Prestressed Concrete Box Girder Strengthened with Bonded Steel Plates

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