C-Anchor for Strengthening the Connection between Adhesively Bonded Laminates and Concrete Substrates

Razaqpur, A. Ghani; Mostafa, Ahmed

doi:10.3390/technologies3040238

Cited by 10 publications

(4 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Some of these failures are the result of terrorist attacks involving explosives [2], which damage PS bridge members or tendons [3]. The losing strands on the concrete member have a great effect on the design PS force which reflects a reduction of the nominal capacity and lack of serviceability [4]. One of the strengthening findings that will be investigated in this paper is the evaluation of the use of CFRP laminates with and without end anchorages for strengthening enhancement.…”

Section: Introductionmentioning

confidence: 99%

“…In practice, it is preferable to prevent the brittle failure mode by either eliminating it or shifting it to a more ductile mode. Anchoring the laminates to the concrete substrate with metallic or CFRP anchors may be a practical way to accomplish this [4]. CFRP U-wrapped anchors or other mechanical anchor systems have demonstrated high effectiveness in delaying the delamination process and increasing the strengthening efficiency.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Abbas

Al-Zuhairi²

2022

Eng. Technol. Appl. Sci. Res.

View full text Add to dashboard Cite

This paper examines the impact of flexural strengthening on the percentage of damaged strands in internally unbonded tendons in partially prestressed concrete beams (0, 14.28%, and 28.57%) and the recovering conditions using CFRP composite longitudinal laminates at the soffit, and end anchorage U-wrap sheets to restore the original flexural capacity and mitigate the delamination of the soffit of longitudinal Carbon Fiber Reinforced Polymer (CFRP) laminates. The composition of the laminates and anchors affected the stress of the CFRP, the failure mode, and thus the behavior of the beam. The experimental results revealed that the usage of CFRP laminates has a considerable impact on strand strain, particularly when anchors are employed. The EB-CFRP laminates increased the flexural capacity by approximately 13%, which corresponds to strand damage of 14.28%, while flexural capacity increased by 9.3%, strand damage increased by 28.57% for members strengthened with laminates only, and around 21.58% and 16.85% for members reinforced with laminates and end anchorings. Quasi-experimental equations have been proposed to estimate the actual stress of untethered tendons considering the effect of CFRP laminates and final fixation winding.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Abbas

Al-Zuhairi²

2022

Eng. Technol. Appl. Sci. Res.

View full text Add to dashboard Cite

show abstract

“…Muitos autores recomendam a utilização de sistemas de ancoragem RAZAQPUR, 2013;FERRARI et al, 2002;SKUTURNA;VALIVONIS, 2016) a fim de evitar o rompimento prematuro das vigas reforçadas com CRFC, além de poder aumentar a carga última dessas vigas por meio destes incrementos de ancoragem (DEMAKOS et al, 2013;MOSTAFA, 2015).…”

Section: Introductionunclassified

Análise experimental de vigas biapoiadas de concreto armado reforçadas a flexão por CRFC

Pivatto

Puppi

Kimura

et al. 2021

REC

View full text Add to dashboard Cite

Este trabalho tem como objetivo examinar a eficiência do reforço estrutural utilizando Compósitos Reforçados com Fibra de Carbono (CRFC), avaliando o aumento da resistência de vigas biapoiadas de concreto armado. Para isto, vigas de concreto armado receberam a implantação de camadas de CRFC, para que fossem verificadas as diferenças de deformações, as mudanças nos valores de carga de ruptura e os modos de falha destas vigas. Foi feita a previsão das cargas de ruptura das vigas reforçadas por meio do método de dimensionamento utilizado. As vigas foram rompidas em laboratório pelo ensaio de flexão a quatro pontos até o seu colapso. Os ensaios experimentais comprovaram a efetividade deste método de reforço estrutural. No que concerne os resultados, foi possível perceber que a utilização do reforço estrutural com CRFC foi capaz de aumentar a resistência das vigas em até 34%. Além disso, observou-se que a implantação do CRFC pode mudar significativamente a ductilidade da viga reforçada. Para mais, a utilização dos incrementos de ancoragem mostrou um aumento de até 42% na carga última e aumento na deformação de tração de até 102% em relação a viga de referência, dando origem a um maior aparecimento de fissuras.

show abstract

“…. The loss of strands on the concrete member significantly impacts the design prestressed force, indicating a decrease in nominal capacity and lack of serviceability (Razaqpur and Mostafa, 2015). In this publication, one of the strengthening discoveries that will be studied is the usage of CFRP-laminate with and without anchorage to improve the laminate used for strengthening.…”

mentioning

confidence: 99%

Impact of Anchored CFRP Composites on the Strengthening of Partially Damaged PC Girders

Abbas,

Al‐Zuhairi

2023

jcoeng

View full text Add to dashboard Cite

This manuscript investigated the effect of anchorage CFRP wrapping sheets, bolts, and laminate interlock on increasing the efficiency of flexural strengthening for the post-tension girder using CFRP composites techniques longitudinal laminates at the soffit for partially damaged loss of about 14.3% from its area of prestressed concrete beams, and the impact on restoring the original flexural capacity of PC girder. Mitigating delamination of the soffit of horizontal laminates (CFRP). The texture of the laminate and anchorages influenced the stress of the laminate carbon fiber, the mode of crack propagation and failure, and consequently, the beam's attitude has been investigated in this manuscript. The experimental findings demonstrated that using CFRP laminates significantly affects strand strain, especially when anchorage wrapping is applied. The laminates CFRP-EB enhanced the flexural capacity by around 13% of the original strength, which equates to a 13% increase in strand damage. Despite an increase in flexural capacity of 20%, 22%, and 29% when using anchorage wrapping, mechanical bolts, and laminate interlock, respectively. It has been proposed to use quasi-experimental equations to predicate the actual stress of un-grouted strands, considering the influence of CFRP laminate and wrapping anchorage sheets techniques only. The experiment outcomes demonstrated that using Anchored CFRP significantly affects load-carrying capacity and cracking load by up to 29% and delays the bonding failure.

show abstract

C-Anchor for Strengthening the Connection between Adhesively Bonded Laminates and Concrete Substrates

Cited by 10 publications

References 23 publications

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

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

Análise experimental de vigas biapoiadas de concreto armado reforçadas a flexão por CRFC

Impact of Anchored CFRP Composites on the Strengthening of Partially Damaged PC Girders

Contact Info

Product

Resources

About