Influence of High Strength Concrete on Transfer and Development Length of Pretensioning Strand

Mitchell, Denis; Cook, William D.; Khan, Ahmad Ali; Tham, T

doi:10.15554/pcij.05011993.52.66

Cited by 105 publications

(68 citation statements)

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“…The Russell' model most greatly overestimated the transfer length of steel strands in UHPFRC, while the Martí-Vargas's model most greatly underestimated it. The models proposed by Mitchell et al (1993), Eurocode 2 (EN 2004), and Dang et al (2016b) quite reasonably predicted the transfer length of strands in UHPFRC with the average ratio (prediction/experiment) of 1.10 and 0.90, respectively. However, for a conservative design perspective, the Mitchell's model could be recommended to be most appropriate for predicting the transfer length of steel strands in UHPFRC.…”

Section: Transfer Lengthmentioning

confidence: 78%

“…UHPFRC exhibited much shorter transfer lengths than HSC, and the ACI 318 and AASHTO LRFD codes significantly overestimated the transfer length of a strand embedded in UHPFRC. Based on a design perspective, the model proposed by Mitchell et al (1993) was considered to be most proper for predicting the transfer length of steel strands in UHPFRCC.…”

Section: Discussionmentioning

confidence: 99%

“…Based on a reasonable limit for the higher values of transfer length, Russell and Burns (1996) have proposed the transfer length formula having similar shape with the ACI 318 model, as follows Mitchell et al (1993) also have suggested a prediction model of transfer length of steel strands embedded in highstrength concrete based on a number of precast, pretensioned concrete beams, as follows…”

Section: Transfer Lengthmentioning

confidence: 99%

See 2 more Smart Citations

Bond Behavior of Pretensioned Strand Embedded in Ultra-High-Performance Fiber-Reinforced Concrete

Shin

Lee

Yoo

2018

Int J Concr Struct Mater

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This study aimed to investigate the bond properties of prestressing strands embedded in ultra-high-performance fiberreinforced concrete (UHPFRC). Toward this end, two types of prestressing strands with diameters of 12.7 and 15.2 mm were considered, along with various concrete cover depths and initial prestressing force magnitudes. The average bond strength of the strands in UHPFRC was estimated by using pullout tests, and the transfer length was evaluated based on a 95% average maximum strain method. Test results indicated that the average bond strength of the pretensioned strand reduced as the diameter of the strand increased, and was between the bond strengths of round and deformed steel rebars. Higher bond strength was also obtained with a lower embedment length. Based on a comparison of p value, the bar diameter and embedment length most significantly influenced the bond strength of strands in UHPFRC, compared to a ratio of cover depth to diameter and initial prestressing force. Pretensioned strands in UHPFRC exhibited much higher bond strength and shorter transfer length compared with strands embedded in ordinary high-strength concrete. Lastly, ACI 318 and AASHTO LRFD codes significantly overestimated the transfer length of the strands embedded in UHPFRC.

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Section: Transfer Lengthmentioning

confidence: 78%

Section: Discussionmentioning

confidence: 99%

Section: Transfer Lengthmentioning

confidence: 99%

See 1 more Smart Citation

Bond Behavior of Pretensioned Strand Embedded in Ultra-High-Performance Fiber-Reinforced Concrete

Shin

Lee

Yoo

2018

Int J Concr Struct Mater

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“…(Ghosh and Fintel, 1986;Mitchell et al, 1993;Roller et al, 1995), 단부균열에 대한 보강에 관한 연구 (Marshall, 1966;Marshall and Mattok, 1962;Nawy and Huang, 1977;Mirza and Tawfik, 1978) 그리고 프리텐션 부재의 피로와 내구성에 관한 연구 (Kaar et al, 1975;Boshore, 1965;Rabbat et al, 1979;Russell and Burns, 1994 3개 또는 7가닥 강선으로 된 프리텐션용 강연선은 위험단면을 지나 다음의 정착 길이 이상으로 부착되어야 한다.…”

Section: Fig 1 Concept Of Pretension Systemunclassified

A Structural Performance Test of a Full-scale Pretension PSC Girder

Kim

2013

Journal of the Korean Society of Civil Engineers

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The main purpose of this study is to investigate the static behavior of a prestressed concrete (PSC) girder using pre-tension method. A 30m long full-scale pretension PSC girder is fabricated by the portable fabrication system and tested. All results have been compared to those obtained from F.E.A results. Deflections at the middle of girders have been measured for evaluation. Also, strains of concrete at the middle of span have been measured. From the results of experimental, the load when initial crack was developed was obtained to be 1.75 time the unfactered design load in the full-scale girder specimen. Also, the data of specimen are satisfied the desgin requirements of ductility on the Korea Bridge Design Specification(2010). In service state, the vertical deflection at center of test specimen when a initial crack was developed is satisfied the vertical deflection requirement under live load of the Korea Bridge Design Specification(2010). To verify the experimental results, we numerical analyze the test and confirmed that the data were similar with results from the test above. The pretension girder fabricated in site were found to have enough stregnth for safety under and after construction.

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“…The ACI transfer length equation was derived from and based on an average transfer bond stress of 2.76 MPa (Tabatabai and Dickson 1993). In addition, several authors (Zia and Mostafa 1977;Shahawy et al 1992;Mitchell et al 1993;Deatherage et al 1994;Buckner 1995;Tadros and Baishya 1996;Mahmoud et al 1999) consider that using term f si (the initial effective stress in a prestressing strand just after the prestress transfer, accounting for losses only by the elastic shortening of concrete) in Eq. (1) is more rational for design purposes than f se by considering that transfer length is established at the release of prestress and that it does not significantly change over time.…”

Section: Introductionmentioning

confidence: 99%

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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Influence of High Strength Concrete on Transfer and Development Length of Pretensioning Strand

Cited by 105 publications

References 0 publications

Bond Behavior of Pretensioned Strand Embedded in Ultra-High-Performance Fiber-Reinforced Concrete

Bond Behavior of Pretensioned Strand Embedded in Ultra-High-Performance Fiber-Reinforced Concrete

A Structural Performance Test of a Full-scale Pretension PSC Girder

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

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