New reduction factor for Cracked Square hollow section K-joints

S. P. Vipin; A. Kolios; S. T. Lie; L. Wang

doi:10.1016/j.jcsr.2018.01.024

New reduction factor for Cracked Square hollow section K-joints

S. P. Vipin, A. Kolios, S. T. Lie, L. Wang

School of Mechanical, Aerospace and Automotive Engineering

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

37 Downloads (Pure)

Abstract

Cracks are commonly observed at the hot spot stress location of tubular joints and it can be due to fatigue, accidental damage or corrosion. As a consequence, the plastic collapse load (P_c) of the tubular joints is reduced, and hence it is necessary to produce design guidance which can safely be used to estimate the static residual strength of cracked tubular structures in practice. This paper proposes a new expression for determining the reduction factor (F_AR) of cracked square hollow section (SHS) K-joints. A completely new and robust finite element mesh generator which is validated using the full scale experimental test results is used for the parametric study to propose the new F_AR expressions for cracked SHS K-joints. The crack area and the brace to chord width ratio (β) are shown to have the most profound effect on the P_c load of cracked SHS K-joints. For a given value of crack area, the variation of the F_AR values is up to 3.6% for different values of β. Furthermore, the F_AR values calculated using the existing equation given in the latest BS 7910:2013 + A1:2015 for circular hollow section (CHS) joints are revealed to be conservative up to 23.5%.

Original language	English
Journal	Journal of Constructional Steel Research
Volume	144
Early online date	11 Feb 2018
DOIs	https://doi.org/10.1016/j.jcsr.2018.01.024
Publication status	Published - 1 May 2018

Bibliographical note

NOTICE: this is the author’s version of a work that was accepted for publication in Journal of Constructional Steel Research. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Constructional Steel Research, 144, (2018), DOI 10.1016/j.jcsr.2018.01.024

Keywords

Cracks
Finite element analysis
Plastic collapse load
Reduction factor
Square hollow section K-joint

ASJC Scopus subject areas

Civil and Structural Engineering
Building and Construction
Mechanics of Materials
Metals and Alloys

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10.1016/j.jcsr.2018.01.024

000Final_JCSR_5082_Revised_manuscript_Vipin_Kolios_Lie_Wang_Accepted author manuscript, 1.62 MBLicence: CC BY-NC-ND

Cite this

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title = "New reduction factor for Cracked Square hollow section K-joints",

abstract = "Cracks are commonly observed at the hot spot stress location of tubular joints and it can be due to fatigue, accidental damage or corrosion. As a consequence, the plastic collapse load (Pc) of the tubular joints is reduced, and hence it is necessary to produce design guidance which can safely be used to estimate the static residual strength of cracked tubular structures in practice. This paper proposes a new expression for determining the reduction factor (FAR) of cracked square hollow section (SHS) K-joints. A completely new and robust finite element mesh generator which is validated using the full scale experimental test results is used for the parametric study to propose the new FAR expressions for cracked SHS K-joints. The crack area and the brace to chord width ratio (β) are shown to have the most profound effect on the Pc load of cracked SHS K-joints. For a given value of crack area, the variation of the FAR values is up to 3.6% for different values of β. Furthermore, the FAR values calculated using the existing equation given in the latest BS 7910:2013 + A1:2015 for circular hollow section (CHS) joints are revealed to be conservative up to 23.5%.",

keywords = "Cracks, Finite element analysis, Plastic collapse load, Reduction factor, Square hollow section K-joint",

author = "Vipin, {S. P.} and A. Kolios and Lie, {S. T.} and L. Wang",

note = "NOTICE: this is the author{\textquoteright}s version of a work that was accepted for publication in Journal of Constructional Steel Research. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Constructional Steel Research, 144, (2018), DOI 10.1016/j.jcsr.2018.01.024 ",

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AU - Vipin, S. P.

AU - Kolios, A.

AU - Lie, S. T.

AU - Wang, L.

N1 - NOTICE: this is the author’s version of a work that was accepted for publication in Journal of Constructional Steel Research. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Constructional Steel Research, 144, (2018), DOI 10.1016/j.jcsr.2018.01.024

PY - 2018/5/1

Y1 - 2018/5/1

N2 - Cracks are commonly observed at the hot spot stress location of tubular joints and it can be due to fatigue, accidental damage or corrosion. As a consequence, the plastic collapse load (Pc) of the tubular joints is reduced, and hence it is necessary to produce design guidance which can safely be used to estimate the static residual strength of cracked tubular structures in practice. This paper proposes a new expression for determining the reduction factor (FAR) of cracked square hollow section (SHS) K-joints. A completely new and robust finite element mesh generator which is validated using the full scale experimental test results is used for the parametric study to propose the new FAR expressions for cracked SHS K-joints. The crack area and the brace to chord width ratio (β) are shown to have the most profound effect on the Pc load of cracked SHS K-joints. For a given value of crack area, the variation of the FAR values is up to 3.6% for different values of β. Furthermore, the FAR values calculated using the existing equation given in the latest BS 7910:2013 + A1:2015 for circular hollow section (CHS) joints are revealed to be conservative up to 23.5%.

AB - Cracks are commonly observed at the hot spot stress location of tubular joints and it can be due to fatigue, accidental damage or corrosion. As a consequence, the plastic collapse load (Pc) of the tubular joints is reduced, and hence it is necessary to produce design guidance which can safely be used to estimate the static residual strength of cracked tubular structures in practice. This paper proposes a new expression for determining the reduction factor (FAR) of cracked square hollow section (SHS) K-joints. A completely new and robust finite element mesh generator which is validated using the full scale experimental test results is used for the parametric study to propose the new FAR expressions for cracked SHS K-joints. The crack area and the brace to chord width ratio (β) are shown to have the most profound effect on the Pc load of cracked SHS K-joints. For a given value of crack area, the variation of the FAR values is up to 3.6% for different values of β. Furthermore, the FAR values calculated using the existing equation given in the latest BS 7910:2013 + A1:2015 for circular hollow section (CHS) joints are revealed to be conservative up to 23.5%.

KW - Cracks

KW - Finite element analysis

KW - Plastic collapse load

KW - Reduction factor

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DO - 10.1016/j.jcsr.2018.01.024

M3 - Article

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VL - 144

JO - Journal of Constructional Steel Research

JF - Journal of Constructional Steel Research

SN - 0143-974X

ER -

New reduction factor for Cracked Square hollow section K-joints

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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