Application of 1000N Class Ultra-high Strength Steel to the Building

Kitaoka, Satoshi; Fukuda, Ken; Ichinohe, Yasuo; Kanno, Ryoichi; Taga, Kenzo

doi:10.2749/222137815815775321

Cited by 3 publications

(3 citation statements)

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“…Steel materials used for building structures have a wide range of strength levels (EN1993-1-12, 2005; Murakami et al. , 2014; Kitaoka et al. , 2015), and many high-temperature coupon tests have been conducted on various steels of normal-strength (Cooke, 1988; Outinen and Makelainen, 1994; Kirby and Preston, 1988; Outinen and Makelainen, 2004; Honda et al.…”

Section: Introductionmentioning

confidence: 99%

“…As per the AIJ design guideline, the effective yield strength is defined as the stress at 1% strain based on the results of high-temperature coupon tests at a strain rate of 0.3%/min (JIS, 1998). Steel materials used for building structures have a wide range of strength levels (EN1993-1-12, 2005Murakami et al, 2014;Kitaoka et al, 2015), and many high-temperature coupon tests have been conducted on various steels of normal-strength (Cooke, 1988;Outinen and Makelainen, 1994;Kirby and Preston, 1988;Outinen and Makelainen, 2004;Honda et al, 1999;Zako et al, 2000;AIJ, 2017a, b) to high-strength (Qiang et al, 2012(Qiang et al, , 2013(Qiang et al, , 2016Murakami and Ichinohe, 2009;Murakami et al, 2013;Sugimoto et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Bending strength of full-scale wide-flange steel beams considering strain rate effects at elevated temperatures

Kimura

Onogi

Yotsumoto

et al. 2023

JSFE

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PurposeIn this study, the effects of strain rate on the bending strength of full-scale wide-flange steel beams have been examined at elevated temperatures. Both full-scale loaded heating tests under steady-state conditions and in-plane numerical analysis using a beam element have been employed.Design/methodology/approachThe load–deformation relationships in 385 N/mm2-class steel beam specimens was examined using steady-state tests at two loading rate values (0.05 and 1.00 kN/s) and at two constant member temperatures (600 and 700 °C). Furthermore, the stress–strain relationships considering the strain rate effects were proposed based on tensile coupon test results under various strain rate values. The in-plane elastoplastic numerical analysis was conducted considering the strain rate effect.FindingsThe experimental test results of the full-scale steel beam specimens confirmed that the bending strength increased with increase in strain rate. In addition, the analytical results agreed relatively well with the test results, and both strain and strain rate behaviours of a heated steel member, which were difficult to evaluate from the test results, could be quantified numerically.Originality/valueThe novelty of this study is the quantification of the strain rate effect on the bending strength of steel beams at elevated temperatures. The results clarify that the load–deformation relationship of steel beams could be evaluated by using in-plane analysis using the tensile coupon test results. The numerical simulation method can increase the accuracy of evaluation of the actual behaviour of steel members in case of fire.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bending strength of full-scale wide-flange steel beams considering strain rate effects at elevated temperatures

Kimura

Onogi

Yotsumoto

et al. 2023

JSFE

View full text Add to dashboard Cite

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“…High-strength steel, which can help reduce the cross-section, is an effective alternative. High-strength steel for use in the construction field (Murakami et al ., 2014; Kitaoka et al ., 2015) has been commercialized for the strength range (standard design value of yield point ( f y )) of 880 N/mm 2 , which is more than three times higher than that of the conventional mild steel ( f y of 235 N/mm 2 ).…”

Section: Introductionmentioning

confidence: 99%

The effects of strain rate on the effective yield strength of high-strength steel at elevated temperatures

Kimura

Onogi

Ozaki

2023

JSFE

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PurposeThis work examines the effects of strain rate on the effective yield strength of high-strength steel at elevated temperatures, through tensile coupon tests at various strain rates, to propose appropriate reduction factors considering the strain rate effect.Design/methodology/approachThe stress–strain relationships of 385 N/mm2, 440 N/mm2 and 630 N/mm2-class steel plates at elevated temperatures are examined at three strain rate values (0.3%/min, 3.0%/min and 7.5%/min), and the reduction factors for the effective yield strength at elevated temperatures are evaluated from the results. A differential evolution-based optimization is used to produce the reduction-factor curves.FindingsThe strain rate effect enhances with an increase in the standard design value of the yield point. The effective yield strength and standard design value of the yield point exhibit high linearity between 600 and 700 °C. In addition to effectively evaluating the test results, the proposed reduction-factor curves can also help determine the ultimate strength of a steel member at collapse.Originality/valueThe novelty of this study is the quantitative evaluation of the relationship between the standard design value of yield point at ambient temperature and the strain-rate effect at elevated temperatures. It has been observed that the effect of the strain rate at elevated temperatures increases with the increase in the standard design value of the yield point for various steel strength grades.

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Advances in Steel Materials and Steel Structures in Japan

Kanno¹,

Tsujii²

2015

IABSE Conference, Nara 2015: Elegance in Structures

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<p>Over the course of 150 years since the construction of Japan's first cast iron bridge in 1868, Japan has become one of the most advanced countries in terms of steel structures. This advance is attributed largely to the contributions made by high performance steels. In Japan, steel material innovations have enabled progress in steel structures to leap forward, and in turn, challenging new structures has given birth to further advancements in steel materials. In this paper, the developments in steel structures and materials are reviewed and discussed. One conclusion drawn from this review and discussion is that steel still has the potential as a new emerging material to make further contributions to the advancement of steel structures.</p>

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Application of 1000N Class Ultra-high Strength Steel to the Building

Cited by 3 publications

References 1 publication

Bending strength of full-scale wide-flange steel beams considering strain rate effects at elevated temperatures

Bending strength of full-scale wide-flange steel beams considering strain rate effects at elevated temperatures

The effects of strain rate on the effective yield strength of high-strength steel at elevated temperatures

Advances in Steel Materials and Steel Structures in Japan

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