Residual mechanical properties of high strength steels after exposure to fire

Li, Haiting; Young, Ben

doi:10.1016/j.jcsr.2018.05.028

Cited by 68 publications

(31 citation statements)

References 18 publications

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“…The measured material stress-strain curves of the longitudinal and transverse coupons at room temperature and after exposure to various levels of elevated temperatures are plotted in Figs 6 and 7, respectively. In comparison with the room temperature material stress-strain histories, the post-fire stress-strain responses of S690 high strength steel exhibit longer yield plateaux and enhanced material ductility, though accompanied by reductions in material ultimate stresses, as also observed in previous experimental studies [11][12][13] on the post-fire material properties of S690 high strength steel. Table 1(a) reports the key measured material properties at room temperature, including the Young's modulus E, the yield stress fy and the ultimate stress fu, while Table 1(b) presents the derived key material properties of the tensile coupons after exposure to elevated temperatures, where ET, fy,T and fu,T respectively denote the post-fire Young's modulus, yield stress and ultimate stress.…”

Section: Post-fire Materials Tensile Coupon Testssupporting

confidence: 73%

“…A series of experimental and numerical studies on S690 high strength steel welded I-section columns [7][8][9] and beam-columns [10] were performed to respectively investigate their member stability in pure compression and combined compression and bending moment, and on the basis of the experimental and numerical results, the relevant design provisions prescribed in the existing design standards were examined, followed by the development of new design proposals. It is worth noting that the aforementioned studies were conducted on S690 high strength steel welded I-section structural components at room temperature; however, research into their behaviour under fire and post-fire conditions remains scarce, despite three experimental studies [11][12][13] on the post-fire material properties of S690 high strength steel. This prompts a research project being carried out at Nanyang Technological University, with the aim of examining the material and structural behaviour of S690 high strength steel welded I-section members in fire and after exposure to fire.…”

Section: Introductionmentioning

confidence: 99%

“…The derived material stress-strain curves of the S690 high strength steel longitudinal and transverse coupons after exposed to elevated temperatures were discussed, with the degree of anisotropy investigated. The obtained key postfire material properties, together with those reported in previous experimental studies [11][12][13], were carefully studied, and then employed to develop simple but precise retention factors for material modulus and strengths. The patterns and amplitudes of the measured membrane residual stresses in S690 high strength steel welded I-sections after exposure to elevated temperatures were thoroughly analysed, with a predictive model proposed.…”

Section: Introductionmentioning

confidence: 99%

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Material properties and membrane residual stresses of S690 high strength steel welded I-sections after exposure to elevated temperatures

Sun

Liang

et al. 2020

Thin-Walled Structures

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This paper reports a thorough experimental investigation into the material properties and membrane residual stresses of S690 high strength steel welded I-sections after exposure to seven levels of elevated temperatures ranging from 30 ºC (room temperature) to 950 ºC. The experimental programme included heating, soaking and cooling of S690 high strength steel coupons and welded I-section specimens as well as post-fire material tensile coupon tests and membrane residual stress measurements, with the experimental rigs, procedures and results fully reported. The key post-fire material properties were then carefully analysed together with the test data collected from the existing literature, and a new set of retention factor curves of simple multi-linear shapes was proposed and shown to result in accurate predictions of postfire yield and ultimate stresses for S690 high strength steel after exposed to elevated temperatures. Regarding post-fire membrane residual stresses, the measured distribution pattern and peak amplitudes in S690 high strength steel welded I-section after exposed to an elevated 2 temperature of 300 ºC generally remained unchanged in comparison with those in S690 high strength steel welded I-section at room temperature. However, for higher elevated temperatures ranging from ºC to 950 ºC, the peak values of both compressive and tensile membrane residual stresses dramatically decreased, and moreover the discrepancy between the peak compressive and tensile membrane residual stress values became smaller and the transition regions (where the peak tensile residual stresses are changed to the peak compressive residual stresses) became narrower; this can be attributed to the fact that prominent elastic strain redistribution and residual stress relaxation of steel starts from around 500 ºC-600 ºC. A membrane residual stress predictive model was proposed for S690 high strength steel welded I-sections after exposed to elevated temperatures, and shown to well represent the measured membrane residual stress patterns and amplitudes over the full temperature range from 30 ºC to 950 ºC.

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Section: Post-fire Materials Tensile Coupon Testssupporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Material properties and membrane residual stresses of S690 high strength steel welded I-sections after exposure to elevated temperatures

Sun

Liang

et al. 2020

Thin-Walled Structures

View full text Add to dashboard Cite

show abstract

“…To determine this resistance, various tests must be carried out under regional regulations, which simulate normal operating conditions in a real environment. The main mechanical tests carried out are traction, hardness, creep, bending, impact and fatigue [5,6]. Regarding the types of forces that are applied to materials, there is elongation due to a tensile load, compression deformation, shear stress deformation and deformation due to torsional stress [7,8].…”

Section: Introductionmentioning

confidence: 99%

Construction of a Low-Cost Semi-automatic Machine for Tensile Testing

Varela-Aldás

Buele

Cruz

2021

Communications in Computer and Information Science

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Tensile tests make it possible to determine the resistance and other relevant parameters of the materials. These procedures are usually performed with equipment that is expensive and inaccessible to higher education centers with limited budgets. In the case of acquiring this hardware, the disadvantage is that this are purely manual machines that make the use and learning process difficult. That is why this document shows the construction of a machine that allows this type of testing, but using low-cost materials. The mechanical and electronic design and programming that has been used to implement and semi-automate the machine is briefly but clearly described. To validate the functionality, the respective tests have been carried out, although it is a limited version that requires improvements, the results are satisfactory. The curve obtained when carrying out tests with A36 steel has shown a similarity with the theory. Thus, students obtain a technological tool that contributes to academic training, strengthening knowledge in the study of materials.

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“…Sajid and Kiran [18] conducted an experimental study and found that cooling methods have important influences on post-fire mechanical behaviour of ASTM A36 steels. In addition, works were also presented on the post-fire behaviour of steel connections [19,20], pre-stressing steels [21,22], reinforcing steels [23], stainless steels [24][25][26], high strength steels [27][28]29,30] and hot-rolled steels [31]. The post-fire mechanical properties affect the reusability and repair of structures after fire hazards.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of post-fire mechanical properties of Q235 cold-formed steel

Ren

Dai

Huang

et al. 2020

Thin-Walled Structures

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Cold-formed steels have been commonly applied in construction. However, there is a lack of understanding on its post-fire mechanical properties. This paper presents an experimental investigation into the post-fire mechanical properties of cold-formed steels. The test specimens were cut from the flat portion and corners of cold-formed channel sections, which were exposed to temperatures ranging from ambient temperature to 800°C, and then cooled with water and air. The specimens are of grade Q235, and of thickness 1mm and 2mm. The stress-strain curves and mechanical properties of all specimens were obtained from tensile coupon tests. A comparison of mechanical properties between coupon samples cut from flat portion and corners is presented. Moreover, the evolution of microstructure and fracture morphology of specimens after being cooled by air and water were examined. Finally, predictive equations are proposed for evaluating the post-fire mechanical properties of Q235 cold-formed steel channel sections.

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Residual mechanical properties of high strength steels after exposure to fire

Cited by 68 publications

References 18 publications

Material properties and membrane residual stresses of S690 high strength steel welded I-sections after exposure to elevated temperatures

Material properties and membrane residual stresses of S690 high strength steel welded I-sections after exposure to elevated temperatures

Construction of a Low-Cost Semi-automatic Machine for Tensile Testing

Experimental investigation of post-fire mechanical properties of Q235 cold-formed steel

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