Evaluation of strand bond properties along the transfer length of prestressed lightweight concrete members

Vázquez-Herrero, Cristina; Martínez-Lage, Isabel; Aguilar, Gerardo; Martínez-Abella, Fernando

doi:10.1016/j.engstruct.2012.11.027

Cited by 14 publications

(9 citation statements)

References 10 publications

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“…Where, P 1 is the initial tension force on the strand which typically taken as 70-75% of the ultimate stress multiplied by the cross section area of the strand [1,9]. P 2 is the force after the stress released from the strand in which the effective force P  on the strand is…”

Section: (C))mentioning

confidence: 99%

“…Previous researches [8][9][10] indicated that bond strength between concrete and strand is mainly In the current model the steel strand is modelled using three-node beam element. The material degradation and thermal expansion of the steel strand is considered in the model.…”

Section: Effect Of Elevated Temperaturesmentioning

confidence: 99%

“…Vázquez-Herrero et al [9] A flexural bond test of seven-wire indented strand conducted by Lundgren [10] was used to investigate the bond behaviour of this type of strand. The diameter of the strand was 12.9 mm.…”

Section: Seven-wire Smooth and Indented Strands At Ambient Temperaturementioning

confidence: 99%

“…At present, a number of investigations has been conducted to study the bond behaviour between prestressed strands and concrete at ambient temperature [1,[8][9][10][11]. However, there are very limited researches conducted for investigating the bond-slip characteristic between prestressed strands and concrete at elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…is the nominal diameter of the strand and b L is the embedded length of the strand. The values of parameters S 1 , S 2 , S3 and S 4 are assumed based on statistical analysis of the experimental results from the previous researches[1,[9][10][11]16] as given in…”

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confidence: 99%

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Analysis of the bond behaviour between prestressed strands and concrete in fire

Khalaf

Huang

2016

Construction and Building Materials

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In this paper a robust model has been developed to predict the average bond stress-slip relationship between the strands and concrete of prestressed concrete structural members. Two bond-slip curves have been proposed to represent the bond-slip characteristics for the three-wire and seven-wire strands. This model considers the variation of concrete properties, strands' geometries and the type of strand surface, smooth or indented. The degradation of materials and bond characteristic at elevated temperatures are also included in the model. The proposed model has been validated against previous experimental results at both ambient and elevated temperatures.

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Section: (C))mentioning

confidence: 99%

Section: Effect Of Elevated Temperaturesmentioning

confidence: 99%

Section: Seven-wire Smooth and Indented Strands At Ambient Temperaturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Analysis of the bond behaviour between prestressed strands and concrete in fire

Khalaf

Huang

2016

Construction and Building Materials

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Flexural behavior of lightweight concrete beams reinforced with GFRP bars and prestressed with steel strands

Omrani

Dehestani

Yousefpour

2020

Structural Concrete

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The present research is focused on developing efficient, durable flexural members by combining the use of lightweight concrete (LWC), fiber‐reinforced polymer (FRP) bars, and prestressing. The use of LWC reduces the structural weight while providing suitable thermal insulation whereas using FRP bars instead of steel reinforcement provides corrosion resistance, light weight, high tensile strength, and fatigue resistance. Both materials possess smaller moduli of elasticity compared to those in materials within conventional construction, which may cause large deflections and excessive crack widths that are addressed via prestressing. Six LWC beam specimens were fabricated and tested, all of which contained FRP bars. Two specimens were not prestressed, one in under‐reinforced and the other in over‐reinforced conditions. The other four specimens contained different configurations of prestressing steel in addition to FRP bars. The experimental results were used to validate nonlinear finite element models in Abaqus. Results showed that of a prestress level of 6 MPa in concrete reduced the beam deflection at failure by 28% and increased the cracking load by three times. Therefore, a relatively small prestress level could compensate for the increase in deflection and possible cracking, which shows the merits of this combination in providing an optimal solution for the structural members of the future.

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Numerical modeling of the transfer length of 17.8 mm (0.7 in) diameter prestressing strands in pretensioned members

Alkurdi,

Kovács

2024

Discov Appl Sci

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The bond between concrete and reinforcing steel bars in reinforced concrete structures is crucial. Prestressing strands with a diameter of 17.8 mm (0.7 in) transfer higher compression per unit area than smaller strands, improving moment capacity and shear strength and extending the girder span. However, limited research on the bond performance of these 17.8 mm diameter prestressing strands has restricted their widespread use despite their advantages. This study presents a methodology to determine the transfer length of pretensioned members numerically. The influence of pretension force and bond strength on a 17.8 mm diameter strand was assessed through the validation of a finite element model using experimental results from a standardized pretensioned pull-out test. Analytical calculations using different code formulas were also conducted, encompassing strands of varying diameters. Our finite element analysis suggests that a 50.8 mm spacing between adjacent 17.8 mm diameter strands is applicable, ensuring there is no stress overlap in the transfer zones, which can lead to concrete cracking and reduced structural integrity. Existing code formulas, such as ACI 318–19 and AASHTO LRFD 9th edition, require longer transfer lengths when compared with the numerical results. The fib MC 2010 and EC2 formulas offer closer results to numerical results of smaller diameter strands but underestimate the transfer length for the 17.8 mm diameter strand. Therefore, improvements to code formulations may be necessary for more accurate transfer length predictions for this specific strand size.

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Evaluation of strand bond properties along the transfer length of prestressed lightweight concrete members

Cited by 14 publications

References 10 publications

Analysis of the bond behaviour between prestressed strands and concrete in fire

Analysis of the bond behaviour between prestressed strands and concrete in fire

Flexural behavior of lightweight concrete beams reinforced with GFRP bars and prestressed with steel strands

Numerical modeling of the transfer length of 17.8 mm (0.7 in) diameter prestressing strands in pretensioned members

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