Thermal and mechanical properties of high-strength structural steel HSA800 at elevated temperatures

Choi, In-Rak; Chung, Kyung-Soo; Kim, Do Hwan

doi:10.1016/j.matdes.2014.06.035

Cited by 81 publications

(47 citation statements)

References 17 publications

(18 reference statements)

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“…Qiang et al [28][38]- [42], investigated the mechanical properties of HSS S460, S690 and S960 at elevated temperatures, proposing reduction coefficients for these steels based on experimental results. Recent work from Choi et al [43] and Zhao et al [44] can also be found in the literature.…”

Section: Introductionmentioning

confidence: 87%

Fire performance of innovative steel-concrete composite columns using high strength steels

Espinós

Romero

Lam

2016

Thin-Walled Structures

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This paper presents the results of a numerical investigation on strategies for enhancing the fire behaviour of concrete-filled steel tubular (CFST) columns by using inner steel profiles such as circular hollow sections (CHS), HEB profiles or embedded steel core profiles. A three-dimensional finite element model is developed for that purpose, which is capable for representing the various types of sections studied and the nonlinear behaviour of the materials at elevated temperatures. High strength steel is considered in the numerical model, as a possible way to lengthen the fire endurance. The numerical model is validated against experimental results available in the literature for various types of steel-concrete composite sections using inner steel profiles, obtaining satisfactory results. Based on the developed numerical model, parametric studies are conducted for investigating the influence of the cross-sectional geometry and the steel grade of the inner profiles on the fire performance of these composite columns, for eventually providing some practical recommendations.

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Section: Introductionmentioning

confidence: 87%

Fire performance of innovative steel-concrete composite columns using high strength steels

Espinós

Romero

Lam

2016

Thin-Walled Structures

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“…Choi et al (2014) confirmed the latter behaviour when they performed experimental tests at elevated temperatures in order to obtain the thermal and mechanical properties of HSA800 high-strength steel. In particular, a 60% spike of the specific heat of the material was observed between 700 and 800°C, while the thermal conductivity also changes trend at the same temperatures (Table 1).…”

Section: Studies On Mechanical Propertiesmentioning

confidence: 62%

“…Regarding the thermal conductivity, no significant differences between the two types of steel are noticed, although the response of A36 steel is smoother. The thermal expansion of the vanadium steel as a function of temperature, records the same behaviour, compared with the corresponding one of the HSA800 results by Choi et al (2014). Linear relationships, predicting the thermal properties of vanadium steel, as a function of temperature, have been proposed.…”

Section: Studies On Mechanical Propertiesmentioning

confidence: 71%

Mechanical properties of High and Very High Steel at elevated temperatures and after cooling down

2017

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High-strength steels (HSS) are produced using special chemical composition or/and manufacturing processes. Both aspects affect their mechanical properties at elevated temperatures and after cooling down, and particularly the residual strength and the ductility of the structural members. As HSS equates the design of lighter structural elements, higher temperatures are developed internally compared to the elements designed with conventional carbon steel. Therefore, the low thickness members, along with the severe effect of high temperature on the mechanical properties of the HSS, constitute to the increased vulnerability of such structures in fire. Moreover, the re-use and reinstatement of these structures are more challenging due to the lower residual mechanical properties of HSS after the cooling down period. This paper presents a review of the available experimental studies of the mechanical properties of HSS at elevated temperatures and after cooling down. The experimental results are collected and compared with the proposed material model (reduction factors) of EN1993-1-2. Based on these comparisons, modified equations describing the effect of elevated temperatures on the mechanical properties of HSS are proposed. Also, the post-fire mechanical properties of HSS are examined. A comprehensive discussion on the effect of influencing parameters, such as manufacturing process, microstructure, loading conditions, maximum temperature, and others is further explored.

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“…Structures might inevitably expose to fire hazards and the capacities of steel structural members are normally significantly reduced in fire. After the September 11 attacks, the mechanical properties of high strength steels at elevated temperatures have attracted much research attention [2][3][4][5][6][7][8][9], leading to a sound understanding of the behaviour of high strength steel materials in fire. On the other hand, after cooling from elevated temperatures to ambient temperature, the fire damage needs to be assessed from the structural safety point of view.…”

Section: Introductionmentioning

confidence: 99%

Post-fire mechanical properties of high strength steels

Young

2018

Proceedings 12th International Conference on Advances in Steel-Concrete Composite Structures - ASCCS 2018

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High strength steels are becoming increasingly attractive for structural and architectural applications due to their superior strength-to-weight ratio which could lead to lighter and elegant structures. The stiffness and strength of high strength steels may reduce after exposure to fire. The post-fire mechanical properties of high strength steels have a crucial role in evaluating the residual strengths of these materials. This paper presents an experimental investigation on post-fire mechanical properties of cold-formed high strength steels. A series of tensile coupon tests has been carried out. The coupon specimens were extracted from cold-formed square hollow sections with nominal yield stresses of 700 and 900 MPa at ambient temperature. The specimens were exposed to various elevated temperatures ranged from 200 to 1000 °C and then cooled down to ambient temperature before tested to failure. Stress-strain curves were obtained and the mechanical properties, namely, Young's modulus, yield stress (0.2% proof stress) and ultimate strength, of the cold-formed high strength steel materials after exposure to elevated temperatures were derived. The post-fire retention factors that obtained from the experimental investigation were compared with existing predictive equations in the literature. New predictive equations are proposed to determine the residual mechanical properties of high strength steels after exposure to fire. It is shown that the proposed predictive equations are suitable for both cold-formed and hot-rolled high strength steel materials with nominal yield stresses ranged from 690 to 960 MPa.

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Thermal and mechanical properties of high-strength structural steel HSA800 at elevated temperatures

Cited by 81 publications

References 17 publications

Fire performance of innovative steel-concrete composite columns using high strength steels

Fire performance of innovative steel-concrete composite columns using high strength steels

Mechanical properties of High and Very High Steel at elevated temperatures and after cooling down

Post-fire mechanical properties of high strength steels

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