Effect of Elevated Temperatures on High-Tensile-Steel Wires for Prestressed Concrete.

Day, Michael A.; Jenkinson, E. A.; Smith, A. I.

doi:10.1680/iicep.1960.11781

Cited by 9 publications

(4 citation statements)

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“…The cementite lamellae coalesce into globules. This so-called "spheroidization" of the cementite may take several days at 800 F, but takes place in a few hours at 1200 F, and manifests itself in the softening of the material [7,8,121. This effect is marked especially in the case of prestressing steel, the strength of which results, to a great extent, from the fineness of its lamellar pearlite structure.…”

Section: Results Of Creep Testsmentioning

confidence: 99%

Elevated-Temperature Tensile and Creep Properties of Some Structural and Prestressing Steels

Harmathy

Stanzak

1970

Fire Test Performance

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Section: Results Of Creep Testsmentioning

confidence: 99%

Elevated-Temperature Tensile and Creep Properties of Some Structural and Prestressing Steels

Harmathy

Stanzak

1970

Fire Test Performance

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“…And that coefficient is 0.95 at around 400 °C (which is the overfire temperature). After high temperature, the yield strength of prestressed steel bars has a certain relationship with the highest temperature and the initial stress level [20].…”

Section: Displacement Under Ultimate Loading Conditionmentioning

confidence: 99%

Mechanical Properties of Full‐Scale Prestressed Concrete Beams with Thin Slab after Exposure to Actual Fire

Hao

Chen

Tang

et al. 2021

Advances in Materials Science and Engineering

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To provide an effective basis and reference for applications of prestressed concrete thin-slab beams after a bridge fire, methods and principles of fire-resistant design, repair, and reinforcement of such beams were discussed. Taking a simple supported and continuous girder bridge of an expressway in service as a sample, appearance testing and nondestructive testing of the internal structure were carried out. Four representative full-scale prestressed concrete beams were selected. Through the comparative test of the ultimate bearing capacity of such beams, the laws of the deflection deformation, strain distribution, crack formation, and crack development were obtained. By combining with the finite element simulation and theoretical analysis, the ultimate bearing capacity, complex mechanical characteristics, and breakage feature and failure mechanism of such beams were studied. It was indicated by the results the following: (1) Prestress loss will cause height reduction of the concrete shear zone, which is one of the main reasons why the bending-shearing failure of such beams happened before the pure bending failure. (2) Under certain operating loads, brittle fracture is more likely to occur on the bottom surface of such beams when directly exposed to fire. (3) The bursting and spalling depth of concrete after being exposed to fire can be used as the characteristic parameters for the rapid identification of the bottom surface of such after-fire beams.

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“…In the early 1950s, Frank Day et al [7] conducted a preliminary elevated temperature test on the prestressed steel wires used for concrete components. Gales et al [8] and Hou et al [9] studied the mechanical performance of prestressed steel wires with different strength under high temperature.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Behavior of Steel Cables Subject to Localized Fire in Large-Space Buildings

2024

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Pre-tensioned steel cable is a crucial load-bearing component of steel structure, the fire behavior of which affects the overall performance of the structure. However, it presently lacks research and fire safety design method to consider steel cable members subject to localized large-space building fire. In this paper, the mechanical behavior of normal steel strand cable and full-locked steel cable under large-space building fire is investigated, to provide guidance for the fire safety design of steel cable. Firstly, the numerical model of temperature field of steel cables subject to large-space building fire was established and verified with the test results. Secondly, based on the verified temperature field model, the sequential thermal-mechanical coupling numerical model was established to study the fire behavior of steel cable, including temperature field, temperature gradient, failure mechanism, internal force and contact stress. Thirdly, the numerical method was adopted for the parametric analysis on the fire resistance of steel cables, considering the effect of temperature-field model, non-uniform fire, load ratio and span of steel cable. The following conclusions are obtained: 1) The average temperature can be taken to simplify the transverse temperature field due to the small amplitude of transverse temperature gradient of steel cable section; 2) Because of the size effect of steel wire, the overall temperature of normal steel strand cable is higher than that of full-locked steel cable under the same conditions of same nominal diameter and fire conditions, and the damage occurs earlier than that of full-locked steel cable under fire.

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Effect of Elevated Temperatures on High-Tensile-Steel Wires for Prestressed Concrete.

Cited by 9 publications

References 0 publications

Elevated-Temperature Tensile and Creep Properties of Some Structural and Prestressing Steels

Elevated-Temperature Tensile and Creep Properties of Some Structural and Prestressing Steels

Mechanical Properties of Full‐Scale Prestressed Concrete Beams with Thin Slab after Exposure to Actual Fire

Investigation on Behavior of Steel Cables Subject to Localized Fire in Large-Space Buildings

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