Measurement of Transfer Lengths on Pretensioned Concrete Elements

Russell, Bruce W.; Burns, Ned H.

doi:10.1061/(asce)0733-9445(1997)123:5(541)

Cited by 63 publications

(26 citation statements)

References 7 publications

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“…For example, the transfer lengths at the dead end were approximately 36.7 and 26.5% lower than those at the live end for the strands with diameters of 12.7 and 15.2 mm, respectively. This is consistent with the findings of Russell and Burns (1997) and Kaar et al (1963) for ordinary concrete without fibers. In particular, according to the test results performed by Russell and Burns (1997), an approximately 34% greater transfer length was obtained at the live end of the 12.7-mm strand than at the dead end, and an about 20% greater transfer length was observed at the live end than at the dead end by Kaar et al (1963).…”

Section: Transfer Lengthsupporting

confidence: 93%

“…This is consistent with the findings of Russell and Burns (1997) and Kaar et al (1963) for ordinary concrete without fibers. In particular, according to the test results performed by Russell and Burns (1997), an approximately 34% greater transfer length was obtained at the live end of the 12.7-mm strand than at the dead end, and an about 20% greater transfer length was observed at the live end than at the dead end by Kaar et al (1963). In addition, the strand with a large diameter of 15.2 mm exhibited higher compressive strains at the concrete surface when exposed to the prestressing force compared with the strand with a lower diameter of 12.7 mm.…”

Section: Transfer Lengthsupporting

confidence: 93%

“…8. In order to calculate the transfer length, the 95% average maximum strain (AMS) method, which was introduced by Russell and Burns (1997), was adopted, and the calculated transfer lengths are summarized in Table 5. The following process was used to obtain the transfer length by the 95% AMS method: (1) Draw the strain profile ?…”

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 Lengthsupporting

confidence: 93%

Section: Transfer Lengthsupporting

confidence: 93%

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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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“…지, 콘크리트 표면 또는 강연선에 부착하는 전기저항식 게이지 등 많은 방법들이 여러 연구자들 (Zia and Mostafa, 1977;Mitchel et al, 1993;Russell and Burns, 1997;Oh and Kim, 2000;Park et al, 2012) 최근들어 강연선의 긴장력을 계측하기 위해 FBG 센서를 활 용한 기법이 활발히 연구되고 있다 (Udd, 1996;Lau, 2003;Ren et al, 2005;Kim et al, 2008;2010; …”

Section: 프리텐션 부재에서의 전달길이를 측정하기 위해 데믹게이unclassified

Measurement of Transfer Length for a Seven-Wire Strandwith FBG Sensors

Lee¹,

Choi²,

Shin³

et al. 2015

jcoseik

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In this paper, an experimental program has been conducted to investigate transfer length in high strength concrete members pretensioned through a seven-wire strand with FBG sensors. To measure transfer length, five members were fabricated, which had a length of 3 m and a cross-section of 150×150mm. It was measured that the concrete compressive strength was 58MPa at pretensioning. Test results indicated that more precise and reliable measurement on the transfer length was attained with FBG sensors than conventional gauges attached on concrete surface. Through comparing the measured transfer length and predictions, applicability of several transfer length models in literature was investigated. This paper can be useful for relevant research field such as investigation on the bond mechanism of a seven-wire strand in concrete members.

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“…To validate the model for determining the transmission length, the results of Russell and Burns [4], who manufactured pretensioned prisms of 102mm x 127mm x 3,660mm with seven-wire strands, were analytically simulated. They used single strands φ 12.7mm and 15.2mm, placed in the barycentre of the cross-section.…”

Section: Transmission Length Calculationmentioning

confidence: 99%

Bond modelling of prestressed concrete during the prestressing force release

Benítez

Gálvez

2010

Mater Struct

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This paper presents an analytical model for simulating the bond between steel and concrete, in precast prestressed concrete elements, during the prestressing force release. The model establishes a relationship between bond stress, steel and concrete stress and slip in such concrete structures. This relationship allows us to evaluate the bond stress in the transmission zone, where bond stress is not constant, along the whole prestressing force release process. The model is validated with the results of a series of tests and is extended to evaluate the transmission length. This capability has been checked by comparing the transmission length predicted by the model and one measured experimentally in a series of tests. Keywords:Bond, prestressed concrete, transmission length, modelling, bond strength IntroductionPrecast prestressed concrete elements are widely used for construction in Europe. A frequent problem of the precast industry is to evaluate the real transmission length in precast prestressed concrete structural elements. The semi-empirical formulae proposed by codes are usually thought for conventional concrete and usual cast conditions, but high performance concrete (high-strength, self-compacting, etc.) and non-usual cast conditions (v.gr. accelerated curing processes) are becoming more and more frequent. In these cases experimental measurement is needed, though the standardised methods are expensive and so difficult to apply by industry. Analytical and numerical models, based on parameters measured experimentally with tests being simpler than complete transmission length tests, would be welcomed. This paper presents an analytical model for steel-concrete bond when the prestressing force is transmitted by releasing the steel (wire or strand). The model is applied to evaluate the transmission length. Theoretical backgroundThe prestressing process of the precast prestressed concrete includes: a) steel wire prestressing, and b) prestressing force transmission after an accelerated curing process of concrete. Let be a prism of concrete with a single prestressed wire placed in the prism longitudinal axis (Fig. 1). Be P 0 the initial prestressing force in the wire and, for a given instant, the force at the end of the wire P 0 -∆P,

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Measurement of Transfer Lengths on Pretensioned Concrete Elements

Cited by 63 publications

References 7 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

Measurement of Transfer Length for a Seven-Wire Strandwith FBG Sensors

Bond modelling of prestressed concrete during the prestressing force release

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