Finite element analysis and formulae for stress concentration factors of diamond bird-beak SHS T-joints

Tong, Le Wei; Xu, Guowen; Liu, Yongqiang; Yan, Dongqiang; Zhao, Xiao Ling

doi:10.1016/j.tws.2014.10.009

Cited by 29 publications

(19 citation statements)

References 15 publications

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“…Furthermore, Ahmadi and Lotfollahi-Yaghin [6] have analyzed KT-joints using FEM to study SCFs due to in-plane bending loads. New types of welded joints like square bird-beak and diamond bird-beak SHS-to-SHS joints were also investigated both experimentally and numerically [7][8][9][10][11][12]. Because of the many benefits gained by the combined action of steel and concrete, concrete filled tubes CFT have been increasingly used in many engineering applications [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Stress Concentration Factors (SCFs) in Circular Hollow Section CHS-to-H-shaped Section Welded T-Joints under Axial Compression

Hamdan

2019

Civ Eng J

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The aim of this paper is to investigate the effects of non-dimensional geometric parameters on stress concentration factors (SCFs) of circular hollow section CHS brace-to-H-shaped section T-connections under axial compression. This type of welded joints is used increasingly in steel construction. However, its fatigue design is not covered by codes, and its fatigue strength has not been given the deserved attention by researchers. This research, however, bridges the gab on SCFs in this type of welded connections when being loaded in axial compression. here, parametric study based on the numerical analysis was performed to evaluate the effect of CHS brace diameter to H-shaped chord flange width ratio (β), H-shaped chord flange width to thickness ratio (2γ) and CHS brace thickness to H-shaped chord flange thickness ratio (τ) on SCFs in the brace and the chord of the connection. Based on practical considerations, the validity range of these parameters was 0.3 ≤ β ≤ 0.7, 16 ≤ 2γ ≤ 30 and 0.2 ≤ τ ≤ 0.1. Three-dimensional finite element (FE) study using commercial software ABAQUS was performed to study the hot spot stress distribution and hence SCFs in this type of welded joints. To begin with, the results of FEM were verified against available experimental data and good agreement was achieved. Afterwards, 48 joints were modeled in Abaqus to study the effect of geometrical parameter on SCFs in brace and chord. Based on the results of this extensive study, the effect of geometrical parameters was revealed. The paper, thus, shows that whilst β increases, SCFs in the brace and chord increases. Moreover, increasing the parameter 2γ results in an increase in SCFs in the two members. However, the change in τ has no significant effect on the SCFs in the brace or the chord. Values of SCFs are found to be between 2 and 7.

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Section: Introductionmentioning

confidence: 99%

Stress Concentration Factors (SCFs) in Circular Hollow Section CHS-to-H-shaped Section Welded T-Joints under Axial Compression

Hamdan

2019

Civ Eng J

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“…Over the years, various methods have been developed to evaluate the fatigue performance of steel tube joints. Among them, hot spot stress stands out as the most popular and successful strategy for fatigue calculated of welded tube joints [3][4][5][6][7][8][9][10][11][12][13][14][15]. Nevertheless, there is not yet a consensus on the effects of weld size on hot spot stress in the calculation of fatigue performance of the joints.…”

Section: Introductionmentioning

confidence: 99%

Effects of weld size on stress concentration factors of CHS-CFSHS joints

Yang

Tong

2018

Frattura Ed Integrità Strutturale

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This paper aims to disclose the effects of weld size on hot spot stress in the calculation of fatigue performance of the joints. For this purpose, the author explored the hot spot stress of CHS-CFSHS T-joints, which consists of circular hollow section (CHS) braces and concrete-filled square hollow section (CFSHS) chords. After reviewing the previous studies and the relevant specifications on weld size, the author probes into the effects of weld size on the stress concentration factor (SCF) of CHS-CFSHS joints via finiteelement analysis. The analysis show that the weld size directly affected the hot spot stress in both conditions, and the influence laws were largely the same; with the increase of weld size, the brace-side SCF plunged when the chordsize weld size remained the same, but the chord-side SCF changed slightly when the brace-side weld size was constant; the brace-side and chord-side SCF declined when the brace-side and chord-side weld sizes increased by the same amount. This research successfully determined the weld sizes that are consistent with the relevant specifications, and safe and simple to apply in actual engineering.

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“…Based on numerical parametric analysis considering welding progress and residual stress, the effects of geometric parameters on the SCFs and hot-spot locations of K-joints were researched by Cao et al [10]. Based on solid finite element analysis models, stress concentration factors of diamond bird beak square hollow section T-joints under axial loading and in-plane bending were numerically studied by Tong et al [11]. SCFs of many kinds of thin-walled concrete-filled CHS joints under axial tension loading were experimentally investigated by Xu and Chen [12].…”

Section: Introductionmentioning

confidence: 99%

Stress concentration factors of negative large eccentricity tubular N-joints under axial compressive loading in vertical brace

Yang

Chen

2015

Thin-Walled Structures

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Finite element analysis and formulae for stress concentration factors of diamond bird-beak SHS T-joints

Cited by 29 publications

References 15 publications

Stress Concentration Factors (SCFs) in Circular Hollow Section CHS-to-H-shaped Section Welded T-Joints under Axial Compression

Stress Concentration Factors (SCFs) in Circular Hollow Section CHS-to-H-shaped Section Welded T-Joints under Axial Compression

Effects of weld size on stress concentration factors of CHS-CFSHS joints

Stress concentration factors of negative large eccentricity tubular N-joints under axial compressive loading in vertical brace

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