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

@article{cdd2d6c85cf04c83953e1bfa580370ab,
title = "Evaluation of ductility limits for structural steel design",
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.",
keywords = "high-strength steel, ductility, diffuse necking, virtual testing, finite element modelling, stress concentration",
author = "Petr Hradil and Asko Talja and Juha Kurkela and Ludovic F{\"u}l{\"o}p and Petri Ongelin",
year = "2017",
month = "8",
day = "1",
doi = "10.1016/j.jcsr.2017.03.022",
language = "English",
volume = "135",
pages = "1--10",
journal = "Journal of Constructional Steel Research",
issn = "0143-974X",
publisher = "Elsevier",

}

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

TY - JOUR

T1 - Evaluation of ductility limits for structural steel design

AU - Hradil, Petr

AU - Talja, Asko

AU - Kurkela, Juha

AU - Fülöp, Ludovic

AU - Ongelin, Petri

PY - 2017/8/1

Y1 - 2017/8/1

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.

KW - high-strength steel

KW - ductility

KW - diffuse necking

KW - virtual testing

KW - finite element modelling

KW - stress concentration

UR - http://www.scopus.com/inward/record.url?scp=85017571688&partnerID=8YFLogxK

U2 - 10.1016/j.jcsr.2017.03.022

DO - 10.1016/j.jcsr.2017.03.022

M3 - Article

VL - 135

SP - 1

EP - 10

JO - Journal of Constructional Steel Research

JF - Journal of Constructional Steel Research

SN - 0143-974X

ER -