Dilation behavior of seven-wire prestressing strand – The Hoyer effect

Brière, Vincent; Harries, Kent A.; Kasan, Jarret; Hager, Charles

doi:10.1016/j.conbuildmat.2012.11.064

Cited by 32 publications

(11 citation statements)

References 3 publications

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“…In addition to adhesion and mechanical bond, stressed strand obtains further anchorage from the 'Hoyer effect' [22]. The Hoyer effect occurs after the stress in the strand is released into the concrete.…”

Section: Stressed Strandmentioning

confidence: 99%

Anchorage and residual bond characteristics of 7-wire strand

Orr

Darby

Ibell

et al. 2017

Engineering Structures

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Section: Stressed Strandmentioning

confidence: 99%

Anchorage and residual bond characteristics of 7-wire strand

Orr

Darby

Ibell

et al. 2017

Engineering Structures

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“…As the optical fiber was bonded to the strand at the valley along the outer wires, the strain calculated from Equation (1) was an average strain of the adjacent two wire strains. Based on this discussion, the method for calculating prestressing force is provided below, which has been used in previous studies [ 27 , 28 ]. Equations (2) and (3) show the formulas for the prestressing force calculation with a lay angle, as follows:

where,

is the strain of the center,

is the strain of the helical wires, and

is the lay angle, as shown in Figure 6 .…”

Section: Resultsmentioning

confidence: 99%

Spiral Deployment of Optical Fiber Sensors for Distributed Strain Measurement in Seven-Wire Twisted Steel Cables, Post-Tensioned against Precast Concrete Bars

Zhu

Chen

2022

Sensors

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On-time monitoring and condition assessments of steel cables provide mission-critical data for informed decision making, ensuring the structural safety of post-tensioned concrete structures. This study aimed to develop a spiral deployment scheme of distributed fiber optic sensors (DFOS) and to monitor/assess the post-tensioned force in seven-wire twisted steel cables, based on the pulse-pre-pump Brillouin optical time domain analysis. Each DFOS was placed in a spiral shape between two surface wires of a steel cable and glued to the steel cable by epoxy. Image observations were conducted to investigate the entireness and bonding condition between the optical fiber and the steel wires. Eight concrete bar specimens were cast, each with a pre-embedded plastic or metal duct at its center and each was post-tensioned by a steel strand through the duct once they were instrumented with two strain and two temperature sensors. The strand was loaded/unloaded and monitored by measuring the Brillouin frequency shifts and correlating them with the applied strains and the resulting cable force after temperature compensation. The maximum, minimum, and average cable forces integrated from the measured stain data were compared and validated with those from a load cell. The maximum (or average) cable force was linearly related to the ground truth data with a less than 10% error between them, after any initial slack had been removed from the test setup. The post-tensioned force loss was bounded by approximately 30%, using the test setup designed in this study.

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“…The mechanisms by which the concrete and prestressing steel bond together in pre-tensioned concrete are: adhesion; Hoyer's effect; and mechanical interlock [13]. As high and ultra-high concrete strength have been introduced in precast concrete usage a higher force has to be transmitted between steel and concrete, as a result, an increased attention should be paid to the prestress transfer and possible influencing parameters [1].…”

Section: 1mentioning

confidence: 99%

“…In pre-tensioned concrete systems, the strands are tensioned within long prestressing beds before the concrete hardening, this system allows the mass production of multiple smaller members at any desired length by cutting the long extended concrete cast for long distances [1]. During production the strands expanded and re-anchor themselves through certain length deeper in the concrete, eventually, the re-anchorage of the strands through elastic radial expansion become known as the Hoyer effect, and the length needed to re-anchor the strands was named development length (or the bond length) [1]. Whereas, The transmission length (𝐿 𝑇 ), is defined as the bonded length that is required to develop an effective prestressing force in a strand within the end anchorage zone [2] as shown in Fig .…”

Section: Introductionmentioning

confidence: 99%

Experimental evaluation of transmission length equations for pre-tensioned hollow core slabs

Abdelatif¹,

Shanan²

2021

kuej

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This paper presents an experimental evaluation of transmission length in hollow core slabs against 18 suggested equations in some codes of practice in addition to some equations from the previous literature. The experimental transmission length was predicted at 95% average mean strain (95% AMS) by measuring changes in strain after wire cutting on the near concrete face using both electric strain gauge and demountable mechanical strain gauges (DEMEC). The ratio between the measured transmission length and the value predicted using codes of practice equations varied from 1.0 to 1.26. On the other hand, the variation was 0.59 to 1.97 for the equations from the previous literature. The experimental results also confirmed the previous findings of non-linear prestress transfer over the transmission zone

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Dilation behavior of seven-wire prestressing strand – The Hoyer effect

Cited by 32 publications

References 3 publications

Anchorage and residual bond characteristics of 7-wire strand

Anchorage and residual bond characteristics of 7-wire strand

Spiral Deployment of Optical Fiber Sensors for Distributed Strain Measurement in Seven-Wire Twisted Steel Cables, Post-Tensioned against Precast Concrete Bars

Experimental evaluation of transmission length equations for pre-tensioned hollow core slabs

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