Comparative Study of Transfer ength in Fiberglass and Steel Pretensioned Concrete Members

Issa, Mohsen A.; Sen, Rajan; Amer, A

doi:10.15554/pcij.11011993.52.63

Cited by 13 publications

(4 citation statements)

References 5 publications

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“…A comparison of the transfer length and modulus of elasticity of different types of FRP reinforcement shows that in most cases, the transfer length of FRP reinforcement (GFRP, CFCC, and CFRP) increases with increasing modulus of elasticity ( Figure 1 f). In [ 36 , 51 , 52 ], it was stated that a lower modulus of elasticity will cause a greater swelling of the reinforcement, resulting in an increase in the confining stresses at transfer. It improves the bond strength of the reinforcement, resulting in a shorter transfer length [ 36 ].…”

Section: Resultsmentioning

confidence: 99%

“…According to [ 51 , 52 ], the bond characteristic of the GFRP reinforcement is superior to that of steel. This can be attributed to the lower modulus of elasticity of the GFRP reinforcement.…”

Section: Parameters That Influence the Transfer Lengthmentioning

confidence: 99%

“…In [ 51 , 52 ], it was calculated that the transfer length increased by 40% and 20% with time (after 600 days) for the GFRP and steel strands, respectively. However, the rate of increase was almost double for GFRP reinforcement compared with steel.…”

Section: Parameters That Influence the Transfer Lengthmentioning

confidence: 99%

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An Analysis of the Transfer Lengths of Different Types of Prestressed Fiber-Reinforced Polymer Reinforcement

Jokūbaitis

Valivonis

2022

Polymers

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The main aim of this paper is to provide a broader analysis of the transfer lengths of different types of fiber-reinforced polymers (FRPs) and to provide corrections to the existing theoretical models. Therefore, this paper presents a description of the main factors that influence the transfer lengths of different types of FRPs based on experimental results found in the literature. A database of more than 300 specimens was compiled with the results of the transfer lengths of different FRPs and the main influencing parameters. The analysis of the database results showed that the transfer length of the carbon fiber composite cable (CFCC) strands depends on the type of prestressed reinforcement release. Therefore, in this article, the new coefficient αt = 2.4 is proposed for the transfer length of suddenly released CFCC strands. Additionally, the transfer length of the aramid fiber reinforced polymer (AFRP) depends on its surface conditions. Therefore, new coefficients αt = 1.5 and αt = 4.0 are also proposed for the transfer lengths of smooth braided and sanded and rough AFRP bars, respectively. Furthermore, the proposed coefficients αt = 2.6, αt = 1.9, and αt = 4.8 found in the literature were validated with the analysis of a larger database of the transfer lengths of glass fiber-reinforced polymer (GFRP) bars, carbon fiber-reinforced polymer (CFRP) bars, and gradually released CFCC strands, respectively. Moreover, the main existing theoretical models are presented, and the comparison of theoretical and experimental transfer length results is discussed. However, the low number of specimens prestressed with basalt fiber-reinforced polymer (BFRP) bars prevented the deeper analysis of the results. the analysis of the transfer length and the proposed new values of the coefficient αt provides possibilities for adapting it to design codes for engineering applications and performing additional research that fills the missing gaps in the field.

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Section: Resultsmentioning

confidence: 99%

Section: Parameters That Influence the Transfer Lengthmentioning

confidence: 99%

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An Analysis of the Transfer Lengths of Different Types of Prestressed Fiber-Reinforced Polymer Reinforcement

Jokūbaitis

Valivonis

2022

Polymers

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“…Transfer and development lengths are critical parameters in designing the tendons of structural prestress members. Issa et al conducted a test on the transfer length of glass fiber-reinforced polymer and found that it has a transfer length of 254 mm to 280 mm less than the value of traditional steel [20]. In the study of the transfer length of CFCC, Domenico has shown, by analyzing a beam, that it has a shorter transfer length than steel [21].…”

Section: Bond and Anchorage Of Tendonmentioning

confidence: 99%

Strength, Serviceability, and Anchorage of Fiber-Reinforced Polymer and Carbon Fiber Composite Prestressing Tendons

Lucena,

Carabbacan,

Manggapis

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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Carbon fiber reinforced polymer (CFRP) and Carbon Fiber composite cable (CFCC) are common types of prestressing member reinforcement. This paper determines the properties of CFRP and CFCC in terms of strength limit, serviceability, and anchorage, which are the primary considerations in designing tendons. The first method in conducting this review is formulating research questions concerning the innovative materials in prestressing tendons and determining behavior and physical properties. The execution used the three-step procedure to retrieve a publication or journal relevant to prestressed concrete tendons and research databases like Google Scholar and EBSCO. In the consolidation of results, it has been found that CFRP exhibits higher tensile strength than CFCC. The serviceability and performance of both CFRP and CFCC were the same as traditional steel reinforcement used in prestressed beams. In anchorage of CFRP and CFCC, the composite bonding wedge is observed to be 100% efficient since it has the same stress capacity as the CFRP tendon.

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Time-dependent evolution of strand transfer length in pretensioned prestressed concrete members

Martí‐Vargas

Ros

2012

Mech Time-Depend Mater

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For design purposes, it is generally considered that prestressing strand transfer length does not change with time. However, some experimental studies on the effect of time on transfer lengths show contradictory results. In this paper, an experimental research to study transfer length changes over time is presented. A test procedure based on the ECADA testing technique to measure prestressing strand force variation over time in pretensioned prestressed concrete specimens has been set up. With this test method, an experimental program that varies concrete strength, specimen cross-section, age of release, prestress transfer method, and embedment length has been carried out. Both the initial and long-term transfer lengths of 13-mm prestressing steel strands have been measured. The test results show that transfer length variation exists for some prestressing load conditions, resulting in increased transfer length over time. The applied test method based on prestressing strand force measurements has shown more reliable results than procedures based on measuring free end slips and longitudinal strains of concrete. An additional factor for transfer length models is proposed in order to include the time-dependent evolution of strand transfer length in pretensioned prestressed concrete members.

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Comparative Study of Transfer ength in Fiberglass and Steel Pretensioned Concrete Members

Cited by 13 publications

References 5 publications

An Analysis of the Transfer Lengths of Different Types of Prestressed Fiber-Reinforced Polymer Reinforcement

An Analysis of the Transfer Lengths of Different Types of Prestressed Fiber-Reinforced Polymer Reinforcement

Strength, Serviceability, and Anchorage of Fiber-Reinforced Polymer and Carbon Fiber Composite Prestressing Tendons

Time-dependent evolution of strand transfer length in pretensioned prestressed concrete members

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