Correlation of Strand Surface Quality to Transfer Length

Dang, Canh N.; Murray, Cameron D.; Floyd, Royce W.; Hale, William; Martí‐Vargas, José R.

doi:10.14359/51686925

Cited by 21 publications

(4 citation statements)

References 17 publications

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“…The tensile force at the loaded end and the strand movement at the free end were monitored using a data acquisition system. For a strand movement of 2·5 mm, the average tensile force of the 15 mm diameter strands used in this study was 85·3 kN with a standard deviation of 9·4 kN (as established in Dang et al (2014Dang et al ( , 2015).…”

Section: Examination Of Strand Surface Conditionsmentioning

confidence: 94%

Prediction of development length from free-end slip in pretensioned concrete members

Dang

Floyd

Hale

et al. 2018

Magazine of Concrete Research

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Development length of prestressing strands is a significant parameter in the design of pretensioned concrete members. The adequacy of the code equations used to predict the development length needs to be verified when a new material or design parameter is introduced for precast, prestressed concrete applications. This study develops a simple and reliable technique to quantify the development length based on the premise of the slip theory, which proposes the free-end slip (FES) as an indicator of the development length. Twenty-five pretensioned concrete beams were cast with 15 mm diameter strands. FES was measured at both beam ends at prestress transfer. Development length was determined by performing bending tests at different embedment lengths. The experimental results were synthesised to revise the slip theory. The applicability of the revised-slip theory was validated by collected experimental data of pretensioned concrete members using various types of concrete, strand diameters and release techniques. Cite this articleDang CN, Floyd RW, Hale WM and Martí-Vargas JR (2018) Prediction of development length from free-end slip in pretensioned concrete members. Magazine of Concrete Research 70 (14): 714-725, https://doi.

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Section: Examination Of Strand Surface Conditionsmentioning

confidence: 94%

Prediction of development length from free-end slip in pretensioned concrete members

Dang

Floyd

Hale

et al. 2018

Magazine of Concrete Research

Self Cite

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“…Previous studies used the distance from the beam end to the intersection of the concrete strain profile with the 95% average maximum strain line as the defined transfer length. 11,12,32,35,36 This technique is slightly different from the technique presented in Fig. 3.…”

Section: Transfer-length Measurementmentioning

confidence: 98%

“…Strand surface condition affects the transfer and development lengths of prestressing strands. 32,33 Twelve strand specimens were cut from a 2000 ft (610 m) reel of 0.7 in. (18 mm) diameter prestressing strand to evaluate the strand surface conditions using the Standard Test Method for Evaluating Bond of Seven-Wire Steel Prestressing Strand (ASTM A1081).…”

Section: Prestressing Strand Testingmentioning

confidence: 99%

Spacing requirements of 0.7 in. (18 mm) diameter prestressing strands

Dang¹,

Floyd²,

Hale³

et al. 2016

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“…The bond mechanism of a strand is a unique interaction that is characterized by adhesion, Hoyer's effect, and mechanical interlock (Abrishami and Mitchell 1993;Dang et al 2014), and therefore an understanding of the bond behavior of a strand embedded in UHPFRC should be fully investigated. For this purpose, the research reported in this paper is aimed at providing new test data and demonstrating the effects of the several parameters that affect the bond behavior of prestressing strands in UHPFRC.…”

Section: Introductionmentioning

confidence: 99%

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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Correlation of Strand Surface Quality to Transfer Length

Cited by 21 publications

References 17 publications

Prediction of development length from free-end slip in pretensioned concrete members

Prediction of development length from free-end slip in pretensioned concrete members

Spacing requirements of 0.7 in. (18 mm) diameter prestressing strands

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

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