Behaviour of steel prestressing wires under extreme conditions of strain rate and temperature

Gálvez, Francisco; Atienza, J. M.; Calafat, Manuel Elices

doi:10.1002/suco.201100030

Cited by 15 publications

(4 citation statements)

References 10 publications

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“…It is important to note that the direct comparison of the elongation obtained with the experimental approaches described in the previous paragraph cannot be performed . To explain it, it is necessary to consider the different components of elongation of a bar at high temperature.…”

Section: Elongation Of a Reinforcing Steel According To Eurocode Modelmentioning

confidence: 99%

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Experimental approach to strength reduction and elongation of self‐tempered reinforcing bars tensioned at a steady and an increasing temperature

Kowalski

Kisieliński

2018

Structural Concrete

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This paper describes experiments performed on specimens of reinforcing bars 10, 12, and 16 mm in diameter. The bars were made of 500 MPa steel produced with Tempcore technology and were subject to simultaneous action of high temperature and tension. The experiments were performed both at a constant temperature of 100, 200, 300, 400, 500, and 600°C and in an increasing temperature and constant load corresponding to 0, 30, 45, 60, or 75% of steel yield strength at a room temperature. The analysis of the obtained results is focused on the reduction of steel strength and on the bar elongation due to high temperature. In the former case, different failure criteria were considered, which corresponded to the elongation of 0.2%, the elongation of 2% or the bar failure. The experimental results were compared with Eurocode 1992‐1‐2 models for the bar elongation below and over 2% and against results of similar test reported in the literature. In the study of bar elongation, different components of total elongation, which can be measured during a constant and an increasing temperature test, are described and compared with each other and Eurocode 1992‐1‐2 model.

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Section: Elongation Of a Reinforcing Steel According To Eurocode Modelmentioning

confidence: 99%

“…describe tests of residual yield strength of bars that were heated to a high temperature and allowed to slowly cool down in air . examined the reduction of bond strength between concrete and steel as the result of high temperature . investigated the influence of high temperature on prestressing wires.…”

Section: Introductionmentioning

confidence: 99%

Experimental approach to strength reduction and elongation of self‐tempered reinforcing bars tensioned at a steady and an increasing temperature

Kowalski

Kisieliński

2018

Structural Concrete

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“…Atienza and Elices (2009) investigated the tensile strength of prestressing wires in and after fire up to 600°C. Gálvez et al (2011) studied the strain rate effect on the tensile strength of prestressing wires at elevated temperatures. The ultimate strength and thermal creep effect of the central wires of prestressing strands conforming to BS 5896 (BSI, 2012) at elevated temperature were investigated by optical strain measurement (Gales et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of prestressing steel in and after fire

Zhang

Wei

et al. 2017

Magazine of Concrete Research

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Knowledge of the mechanical properties of prestressing steel at elevated temperatures and after cooling is essential to the fire resistance design and post-fire evaluation of the residual load-carrying capacity of prestressed concrete structures. Experiments were carried out using an accurate testing system for the development of empirical formulae to predict the deterioration of prestressing steel at elevated temperatures and after cooling. The helical structure of commonly used seven-wire strands allowed estimation of the mechanical properties of the strand based on those of the central wire. Only the central wire of the strand was thus tested, which enabled better clamping and control and hence more accurate measurements. Grade 1860 strands conforming to GB/T 5224, mostly used in Mainland China, and grade 1860 strands conforming to BS 5896, used in Europe and other countries, were tested. Consistent models for the reduction factors of various properties were developed. Some strands extracted from prestressed concrete specimens after fire testing were also tested for verification. Notation E Young's modulus of prestressing wire at ambient temperature E(T) Young's modulus of prestressing wire at temperature T E ac (T) Young's modulus of prestressing wire after cooling from temperature T f(T) reduction factor at temperature T f u ultimate strength at ambient temperature f u (T) ultimate strength at temperature T f uac (T) ultimate strength after cooling from temperature T f yac (T) yield strength of prestressing wire after cooling from temperature T f 0•2% 0•2% proof stress at ambient temperature f 0•2 (T) 0•2% proof stress at temperature T 379

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“…There have been several experimental studies on stress-strain relationships of prestressing steels under elevated temperatures (Zheng, Hu et al 2007, Gálvez, Atienza et al 2011, Gales, Bisby et al 2012, Shakya 2016. However, most of the previous tests were conducted on individual wire specimens, and therefore, data obtained from these studies may not represent the response of strands used in PCHC slabs (Shakya 2016).…”

Section: Stress-strain Relationshipmentioning

confidence: 99%

Shear behavior of deep precast/prestressed concrete hollow-core slabs with and without fibers at ambient and under fire conditions

Hang¹

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Precast/prestressed concrete hollow core (PCHC) slabs have been the favorite products for wall or floor systems since the 1970s. Notwithstanding this, there are still some concerns regarding their web-shear capacity. The reason for this lies in the fact that the presence of longitudinal voids in PCHC slabs reduces the web thickness, resulting in a reduction in the shear capacity compared to that of solid slabs. Moreover, the extrusion method, which is the most popular method to fabricate PCHC slabs, does not allow PCHC slabs to incorporate any stirrups or shear reinforcement. Therefore, their webshear capacity depends solely on the tensile strength of concrete, which is relatively low.

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Behaviour of steel prestressing wires under extreme conditions of strain rate and temperature

Cited by 15 publications

References 10 publications

Experimental approach to strength reduction and elongation of self‐tempered reinforcing bars tensioned at a steady and an increasing temperature

Experimental approach to strength reduction and elongation of self‐tempered reinforcing bars tensioned at a steady and an increasing temperature

Mechanical properties of prestressing steel in and after fire

Shear behavior of deep precast/prestressed concrete hollow-core slabs with and without fibers at ambient and under fire conditions

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