Elevated temperature material behaviour of high-strength steel

Winful, Dorothy A.; Cashell, Katherine A.; Afshan, Sheida; Barnes, Adrienne M.; Pargeter, Richard J.

doi:10.1680/jstbu.16.00213

Cited by 23 publications

(28 citation statements)

References 21 publications

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“…2(a), the Eurocode buckling curve is generally conservative with respect to the buckling coefficients for steel A (S690QL), with the exception of 800°C at non-dimensional slenderness ̅ values below 1. Similarly, in Fig 2(b) the Eurocode buckling curve is conservative and adequately predicts the ultimate buckling load for steel B (S700MC) at all temperatures which is linked to the better strength and stiffness properties observed in previous study [9]. In Fig.…”

Section: Analysis Of Results and Recommendationsupporting

confidence: 66%

“…is the effective yield strength, taken as the stress at 2% total strain at ambient temperature k y,θ is the reduction factor for the effective yield strength (i.e. k y,θ = f y,θ /f y,20 ) taken from [9] γ M,fi is the partial factor for fire situation which is taken as 1.0 in this study, A eff is the effective cross section area determined in accordance with [16] f 0.2p,20 is the 0.2% proof stress at ambient temperature k 0.2p,θ is the reduction factor for the 0.2% proof strength (i.e. k 0.2p,θ =f 0.2p,θ /f 0.2p,20 ) taken from [9].…”

Section: Analysis Of Results and Recommendationmentioning

confidence: 99%

“…All columns were modelled as pin ended providing a slenderness (λ ̅ ) range of 0.5 to 2.5. The measured elevated temperature stress-strain curves for steel A (S690QL) and B (S700MC) determined from a previous study [9], were modified into the true stress versus plastic strain values and incorporated into the models. The same modelling assumptions as explained in the previous sections were employed.…”

Section: Parametric Studiesmentioning

confidence: 99%

“…The nonlinear finite element analysis package ABAQUS [1] was used to develop and validate numerical models for predicting the elevated temperature resistance of high strength steel columns. A parametric study was then conducted, which incorporated the elevated temperature stress-strain relationships of S690QL and S700MC from a parallel experimental programme [9]. Results from that experimental study, showed that S700MC had better strength retention properties than S690QL at temperatures up to 800°C, and this is likely related to the alloying content and production route of these steels.…”

Section: Introductionmentioning

confidence: 99%

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10.33: Flexural buckling behaviour of high strength steel columns under fire conditions

et al. 2017

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In this paper, a numerical modelling study using the finite element (FE) analysis package ABAQUS [1] has been carried out to study the flexural behaviour of square and rectangular hollow section columns made from high strength steel (HSS) grades S690QL and S700MC at temperatures up to 800°C. The FE model was validated using existing experimental data and then parametric studies were performed on columns with varying length and cross-sectional properties. The results have been compared with recommendations given in Eurocode 3 Part 1-2 [2]. The analyses showed that the Eurocode is generally conservative with respect to the buckling coefficients derived and safely predicts the buckling behaviour resistance of columns made from S700MC and suggest a lower buckling curve may be needed for S690QL. It was also shown that the 0.2% proof stress rather than the stress at 2% total strain is a better parameter for deriving buckling curves in fire.

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Section: Analysis Of Results and Recommendationsupporting

confidence: 66%

Section: Analysis Of Results and Recommendationmentioning

confidence: 99%

Section: Parametric Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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10.33: Flexural buckling behaviour of high strength steel columns under fire conditions

et al. 2017

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“…The first paper (Winful et al, 2017) presents an experimental investigation on 690 MPa (quenched and tempered) and S700 MPa (thermo-mechanical control processed) steel materials under isothermal tests at temperatures between 20 and 800 o C. Experimental results indicate the effect of chemical composition and processing route on their elevated temperature material performance. The comparison with the European design code is also discussed.…”

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confidence: 99%

Editorial

Chan

2017

Proceedings of the Institution of Civil Engineers - Structures

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The second part of this two-part themed issue 'High strength steel structures' captures further the state of the art in design of high strength steel structures. Part I of this themed issue can be found on the virtual library (ICE, 2017). Part II features 8 papers on topics ranging from material characteristics at elevated temperature & under cyclic loads, residual stress patterns in fabricated box sections, cross-section behavior of hollow sections under different loading scenarios, assessment on Warren-type welded tubular trusses to structural performance of eccentrically braced frames with the use of dual steel grades.The first two papers focus on the material characterisation of steel materials with nominal yield strengths of 690 MPa and 700 MPa. The first paper (Winful et al., 2017) presents an experimental investigation on 690 MPa (quenched and tempered) and S700 MPa (thermo-mechanical control processed) steel materials under isothermal tests at temperatures between 20 and 800 o C. Experimental results indicate the effect of chemical composition and processing route on their elevated temperature material performance. The comparison with the European design code is also discussed. The second paper (Wang et al., 2017) illustrates the cyclic performance of steel materials with nominal yield strength of 690 MPa (quenched and tempered) with an aim to evaluating and predicting the cyclic characteristics. Results are assessed in relation to the characteristics of the normal strength steel materials in terms of the ductility requirements, the stress-strain hysteretic behaviours, cyclic hardening/softening behaviour. A combined trilinear isotropic and kinematic model is proposed for quenched and tempered steel materials with nominal yield strength of 690 MPa.Moving from material characteristics to the effect of fabrication process on the residual stress patterns at cross-section level, the third paper (Somodi et al., 2017) summarises the experimental and numerical investigations on the residual stress patterns on welded square box sections with a wide range of steel materials with nominal yield strength between 235 MPa and 960 MPa. The assessments are based on the same cross-section geometry and the same welding procedure that was used to form the box-shaped specimens. Results indicate the compressive residual stress pattern is dependent on the cross-section geometry and independent of the yield strength. The measured maximum tensile residual stress reaches the yield strength for all steel grades in the assessment.The subsequent three papers characterise the cross-section behavior of square hollow sections from different fabrication processes and at different loading conditions. The fourth paper (Gkantou et al., 2017a) first presents a numerical investigation on hotfinished square/rectangular hollow section stub columns under concentric compression to assess the current cross-section classification system. Specimens are with nominal yield strength of 460 MPa and 690 MPa. Results indicate the applicability of the cu...

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Fire performance of connections between high‐strength steel tubular members

McCann

Wang

2021

ce papers

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An investigation is conducted into the behaviour of bolted endplate connections between high‐strength steel tubular members at elevated temperatures. Experiments are described where assemblies comprising Grade S460 steel square hollow sections connected via bolted endplates are heated to a target temperature between 150°C and 750°C using ceramic heating pads. The assembly, which is inclined at 45° to the horizontal, is then loaded vertically, thus generating combined bending and axial thrust in the members. The in‐plane vertical deflection, the applied load and temperatures at various points were measured. Results for the ultimate loads, equilibrium paths and the observed failure modes are discussed along with the influence of temperature on these features. A complementary nonlinear finite element analysis of the experimental assemblies is also described. Material models incorporating temperature‐dependent strengths, stiffnesses and strain hardening relationships available from the literature are employed, with temperature fields calibrated using steel temperatures recorded during the experiments applied to the models. It is shown that good agreement exists between the ultimate loads, equilibrium paths and failure modes predicted by the numerical models and those observed in the experiments, thus validating the modelling approach. It is found that, at lower temperatures, buckling of the endplate was the governing mode of failure. With increasing temperature, the mode of failure transitions to flexure in the beam and column stubs, thus suggesting that a relative degree of fixity is offered by the connections at the higher temperatures.

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Elevated temperature material behaviour of high-strength steel

Cited by 23 publications

References 21 publications

10.33: Flexural buckling behaviour of high strength steel columns under fire conditions

10.33: Flexural buckling behaviour of high strength steel columns under fire conditions

Editorial

Fire performance of connections between high‐strength steel tubular members

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