Measured Transfer Lengths of 0.5 and 0.6 in. Strands in Pretensioned Concrete

Russell, Bruce W.; Burns, Ned H.

doi:10.15554/pcij.09011996.44.65

Cited by 77 publications

(47 citation statements)

References 3 publications

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“…Recent experiments have been conducted using an optical strain sensor [17]. However, conventionally strain gauges are attached along the sides of the concrete member prior to release [8]. When the prestressing force is transferred, the compressive strains in the concrete are registered at several distances from the ends of the member.…”

Section: Existing Experimental Methodsmentioning

confidence: 99%

Experimental Technique for Measuring the Long‐term Transfer Length in Prestressed Concrete

Martí‐Vargas¹,

A.²,

Ros³

2012

Strain

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This paper presents a proposal of a test setup and methodology for testing the transfer length evolution through time of prestressing reinforcement in pretensioned prestressed concrete members, aimed at providing a basis for standardization. The proposed test method is based on the instantaneous and time-related analysis of the prestressing reinforcement force profile at only one end of a pretensioned prestressed concrete member. The basis of the test method and the requirements of the prestressing frame and its components are presented, as well as the test procedure stages and the measurement devices. The interpretation of the test results and the criteria to determine both the initial and the long-term transfer lengths are explained.A test method application and the equipment for testing seven-wire prestressing strands have been designed. Some experimental results are provided to validate the test. A comparative analysis of test reliability with other existing experimental methods is also included.

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Section: Existing Experimental Methodsmentioning

confidence: 99%

Experimental Technique for Measuring the Long‐term Transfer Length in Prestressed Concrete

Martí‐Vargas¹,

A.²,

Ros³

2012

Strain

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“…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%

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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“…Maximum stresses are reached at the end of transfer length and beyond the transfer length stresses are constant (see Fig. 3) (Oh, Kim 2000;Russell, Burns 1996;Rose, Russell 1997).…”

Section: Stress Distribution At Transfer Zonementioning

confidence: 99%

The Influence of Prestress Losses on the Anchorage Zone of Prestressed Concrete Member / Įtemptųjų Gelžbetoninių Elementų Įtempių Nuostolių Įtaka Inkaravimo Zonai

Jokūbaitis

Valivonis

Zubrus

2014

Engineering Structures and Technologies

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Abstract. Article briefly discusses the factors affecting bond between concrete and reinforcement of prestressed concrete member. Behavior of prestressed concrete member during release of reinforcement is discussed. Comparative analysis of equations, which describes relation between strand draw-in and transfer length, is presented. Article analyses distribution of loss of prestress at the anchorage zone of prestressed concrete member. Estimation of rational position of strands at the anchorage zone of flexural prestressed concrete member was performed. Influence of constant and linearly variable stress distribution at the end of the strand and member cross-section hight on the position of the reinforcement at the member crosssection is analysed.

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Measured Transfer Lengths of 0.5 and 0.6 in. Strands in Pretensioned Concrete

Cited by 77 publications

References 3 publications

Experimental Technique for Measuring the Long‐term Transfer Length in Prestressed Concrete

Experimental Technique for Measuring the Long‐term Transfer Length in Prestressed Concrete

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

The Influence of Prestress Losses on the Anchorage Zone of Prestressed Concrete Member / Įtemptųjų Gelžbetoninių Elementų Įtempių Nuostolių Įtaka Inkaravimo Zonai

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