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Frontiers of Structural and Civil Engineering

ISSN 2095-2430

ISSN 2095-2449(Online)

CN 10-1023/X

邮发代号 80-968

2019 Impact Factor: 1.68

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Frontiers of Structural and Civil Engineering  2020, Vol. 14 Issue (1): 199-214   https://doi.org/10.1007/s11709-019-0592-9
  本期目录
Investigation of fatigue resistance of fillet-welded tube connection details for sign support structures
Hyungjoo CHOI1, Husam NAJM2()
1. Titan Engineers PC, Union, NJ 08854, USA
2. Department of Civil and Environmental Engineering, Rutgers, the State University of New Jersey, Piscataway, NJ 08853, USA
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Abstract：

Stiffened and unstiffened fillet-welded tube-to-transverse plate connection details are widely used for mast-arm and base-plate connections for highway sign structures. However, due to repetitive wind loads, cyclic fatigue stresses are induced and they are the primary source of failure in welded connections at these locations. The resistance of fatigue critical details has been an on-going research topic because of limited experimental results and the variability in existing fatigue testing results. The main objective of this study is to evaluate fatigue resistance of fillet-welded tube connection details by utilizing the advanced fatigue tool in ANSYS Workbench platform. Finite Element (FE) models development and model validation using existing test data was presented. The resulting fatigue resistance from FE analysis was expressed in terms of fatigue life, fatigue damage, and fatigue safety factor to determine the fatigue performance of fillet-welded connections. Existing fatigue test data was grouped to perform a synthetic analysis and then analysis results were provided to determine input data and fatigue limit for the fatigue module. The local stress level at fatigue critical locations was evaluated using a static FE model for different number of stiffeners and boundary conditions. The results of this investigation provides fatigue resistance of fillet-welded connection details in the form of fatigue life, fatigue damage and safety factor for various connection parameters and structural conditions.
Key words： fatigue    weld connections    base plate    fillet welds
收稿日期: 2018-09-25      出版日期: 2020-02-21
Corresponding Author(s): Husam NAJM   
 引用本文:   
. [J]. Frontiers of Structural and Civil Engineering, 2020, 14(1): 199-214.
Hyungjoo CHOI, Husam NAJM. Investigation of fatigue resistance of fillet-welded tube connection details for sign support structures. Front. Struct. Civ. Eng., 2020, 14(1): 199-214.
 链接本文:  
https://academic.hep.com.cn/fsce/CN/10.1007/s11709-019-0592-9
https://academic.hep.com.cn/fsce/CN/Y2020/V14/I1/199
Fig.1  
Fig.2  
Fig.3  
Fig.4  
Group plate thickness peened galvanized tube shape AM EAN−2σ number of testing data
t≥50.8 mm t<50.8 mm round multisided
1 yes no no no yes no 1.04E+ 08 14
2 yes no no yes yes no 6.58E+ 07 30
3 yes no no no no yes 9.76E+ 07 8
4 no yes no no yes no 2.03E+ 08 17
5 no yes no no no yes 7.33E+ 06 9
6 no yes no yes yes no 2.65E+ 07 8
7 no yes yes no no yes 1.71E+ 08 8
8 no yes yes no yes no 2.25E+ 08 4
Tab.1  
Group post dimension (mm) post thickness (mm) base plate dimension (mm) base plate thickness (mm) fillet welding thickness (mm)
1 254 – 457 6.4 – 55.3 483 50.8 4.8 × 7.9
2 254 – 609 4.5 – 7.9 305 × 457 –
914 × 914		 50.8 – 76.2 9.4 × 15.9
3 –* 4.8 – 7.9 – 63.5 –
4 254 4.5 – 6.1 483 38.1 4.8 × 7.9 –
6.4 × 11.2
5 – 7.9 – 31.8 -
6 254 – 609 4.5 – 7.9 483 38.1 – 44.5 4.8 × 7.9 –
9.4 × 15.9
7 – 7.9 – 31.8 –
8 254 4.5 – 6.1 483 38.1 4.8 × 7.9
Tab.2  
Fig.5  
Fig.6  
Fig.7  
Group failure location number of stiffeners AM EAN−2σ number of testing data
1 base 4–8 9.46E+ 07 15
2 stiffener 4 2.90E+ 08 16
3 stiffener 8 4.74E+ 08 12
Tab.3  
Group post dimension (mm) post thickness (mm) base plate dimension (mm) base plate thickness (mm) fillet welding thickness (mm)
1 254–610 4.5–7.9 483–914 31.8–50.8 4.8 × 7.9 – 9.5 × 15.9
2 254 4.5–7.9 483 31.8–38.1 4.8 × 7.9
3 610 7.9 914 50.8 9.5 × 15.9
Tab.4  
Group height (mm) width (mm) thickness (mm) angle (mm)
1 76–457 51–122 6.4–9.5 15–45
2 76–152 51 6.4–9.5 45
3 83–457 122 9.5 15
Tab.5  
Fig.8  
Fig.9  
Fig.10  
Fig.11  
Group base plate thinness (experiments) base plate thinness (FE model)
1 50.8 mm 50.8 mm
2 50.8 mm – 76.2 mm 50.8 mm
3 38.1 mm 38.1 mm
4 38.1 mm – 44.5 mm 38.1 mm
5 38.1 mm 38.1 mm
Tab.6  
Fig.12  
Fig.13  
number of stiffeners boundary condition locations principal stress (MPa)
8 partially fixed tip of stiffener 108.6
partially fixed base 99.9
fully fixed tip of stiffener 110.2
fully fixed base 53.8
4 partially fixed tip of stiffener 142.2
partially fixed base 142.9
fully fixed tip of stiffener 133.9
fully fixed base 69.9
2 partially fixed base 185.6
fully fixed base 119.8
0 partially fixed base 185.9
fully fixed base 119.9
Tab.7  
Fig.14  
Group base plate thickness
(FE model)		 boundary condition stress
range		 life damage safety factor
1 50.8 mm partially fixed 53.1 MPa 1.53E+ 05 6.52 – 13.05 0.54 – 0.42
fully fixed 34.3 MPa 7.51E+ 05 1.33 – 2.66 0.91 – 0.72
2 50.8 mm partially fixed 53.1 MPa 9.70E+ 04 10.31 – 20.62 0.46 – 0.36
fully fixed 34.3 MPa 4.75E+ 05 2.11 – 4.21 0.78 – 0.62
4 38.1 mm partially fixed 56.9 MPa 2.53E+ 05 3.95 – 7.89 0.63 – 0.50
fully fixed 27.9 MPa 3.05E+ 05 0.33 – 0.66 1.45 – 1.15
6 38.1 mm partially fixed 56.9 MPa 3.31E+ 04 30.2 – 60.5 0.32 – 0.25
fully fixed 27.9 MPa 3.99E+ 05 2.51 – 5.02 0.74 – 0.58
8 38.1 mm partially fixed 56.9 MPa 2.81E+ 05 3.56 – 7.12 0.65 – 0.52
fully fixed 27.9 MPa 3.39E+ 06 0.29 – 0.59 1.50 – 1.19
Tab.8  
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