Evaluation of ductility limits for structural steel design

Petr Hradil, Asko Talja, Juha Kurkela, Ludovic Fülöp, Petri Ongelin

    Research output: Contribution to journalArticleScientificpeer-review

    Abstract

    Structural steels used in buildings and infrastructures have to meet ductility requirements of the design codes to ensure the constructional steelwork ability to resist localized stress concentration in details and cyclic loads. Such requirements are usually minimum ultimate-to-yield strength ratio, uniform elongation and elongation at failure. While not usually a problem for ordinary steel grades, fulfilling these general criteria tend to be difficult for new high-strength grades. This paper presents a refined method for evaluating the ductility requirements, which can be applied for structural details in particular design situations. Such limits might be easier to satisfy than general criteria. The method was applied in a large parametric study of details with circular hole or notch in tension and several selected cases of bended beams with circular holes in their lower flange. The results of the study are formulated as alternative ductility criteria including the new concept of minimum difference between the elongation at failure and uniform strain, the "necking capacity", of the tension coupon.
    Original languageEnglish
    Pages (from-to)1-10
    Number of pages10
    JournalJournal of Constructional Steel Research
    Volume135
    DOIs
    Publication statusPublished - 1 Aug 2017
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Steel
    Ductility
    Elongation
    Cyclic loads
    Flanges
    Yield stress
    Stress concentration

    Keywords

    • high-strength steel
    • ductility
    • diffuse necking
    • virtual testing
    • finite element modelling
    • stress concentration

    Cite this

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    abstract = "Structural steels used in buildings and infrastructures have to meet ductility requirements of the design codes to ensure the constructional steelwork ability to resist localized stress concentration in details and cyclic loads. Such requirements are usually minimum ultimate-to-yield strength ratio, uniform elongation and elongation at failure. While not usually a problem for ordinary steel grades, fulfilling these general criteria tend to be difficult for new high-strength grades. This paper presents a refined method for evaluating the ductility requirements, which can be applied for structural details in particular design situations. Such limits might be easier to satisfy than general criteria. The method was applied in a large parametric study of details with circular hole or notch in tension and several selected cases of bended beams with circular holes in their lower flange. The results of the study are formulated as alternative ductility criteria including the new concept of minimum difference between the elongation at failure and uniform strain, the {"}necking capacity{"}, of the tension coupon.",
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    Evaluation of ductility limits for structural steel design. / Hradil, Petr; Talja, Asko; Kurkela, Juha; Fülöp, Ludovic; Ongelin, Petri.

    In: Journal of Constructional Steel Research, Vol. 135, 01.08.2017, p. 1-10.

    Research output: Contribution to journalArticleScientificpeer-review

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    AU - Hradil, Petr

    AU - Talja, Asko

    AU - Kurkela, Juha

    AU - Fülöp, Ludovic

    AU - Ongelin, Petri

    PY - 2017/8/1

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    N2 - Structural steels used in buildings and infrastructures have to meet ductility requirements of the design codes to ensure the constructional steelwork ability to resist localized stress concentration in details and cyclic loads. Such requirements are usually minimum ultimate-to-yield strength ratio, uniform elongation and elongation at failure. While not usually a problem for ordinary steel grades, fulfilling these general criteria tend to be difficult for new high-strength grades. This paper presents a refined method for evaluating the ductility requirements, which can be applied for structural details in particular design situations. Such limits might be easier to satisfy than general criteria. The method was applied in a large parametric study of details with circular hole or notch in tension and several selected cases of bended beams with circular holes in their lower flange. The results of the study are formulated as alternative ductility criteria including the new concept of minimum difference between the elongation at failure and uniform strain, the "necking capacity", of the tension coupon.

    AB - Structural steels used in buildings and infrastructures have to meet ductility requirements of the design codes to ensure the constructional steelwork ability to resist localized stress concentration in details and cyclic loads. Such requirements are usually minimum ultimate-to-yield strength ratio, uniform elongation and elongation at failure. While not usually a problem for ordinary steel grades, fulfilling these general criteria tend to be difficult for new high-strength grades. This paper presents a refined method for evaluating the ductility requirements, which can be applied for structural details in particular design situations. Such limits might be easier to satisfy than general criteria. The method was applied in a large parametric study of details with circular hole or notch in tension and several selected cases of bended beams with circular holes in their lower flange. The results of the study are formulated as alternative ductility criteria including the new concept of minimum difference between the elongation at failure and uniform strain, the "necking capacity", of the tension coupon.

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    KW - diffuse necking

    KW - virtual testing

    KW - finite element modelling

    KW - stress concentration

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