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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  2019, Vol. 13 Issue (4): 937-949   https://doi.org/10.1007/s11709-019-0528-4
  本期目录
Structural behavior of intermediate length cold-formed steel rack columns with C-stitches
M. ANBARASU1(), Mahmud ASHRAF2
1. Department of Civil Engineering, Government College of Engineering, Salem 636011, India
2. School of Engineering, Deakin University Geelong, VIC 3216, Australia
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Abstract：

This article presents an experimental and numerical investigation on the strength and performance of intermediate length rack column sections with C-stitches under axial compression. The test program consisted of 10 axial concentric compression tests on columns with and without C-stitches under pin end conditions for two different geometric lengths. Finite element (FE) models were developed using commercial FE package ABAQUS considering material and geometric nonlinearities as well as initial geometric imperfections. The elastic buckling properties of the section were calculated using readily available linear elastic buckling analysis tools based on Generalized Beam Theory (GBT) and Finite Strip Method (FSM). Obtained FE results were compared with those obtained experimentally, and once verified the developed FE modeling technique was used to carry out a parametric study to examine changes in structural response due to variations in length, depth and spacing of C-stitches. Observed influences of C-stitches on the behavior and resistance of the considered columns were carefully analyzed, and key design aspects are presented herein.
Key words： cold-formed steel columns    C-stitches    intermediate length columns    distortional buckling
收稿日期: 2018-04-23      出版日期: 2019-07-10
Corresponding Author(s): M. ANBARASU   
 引用本文:   
. [J]. Frontiers of Structural and Civil Engineering, 2019, 13(4): 937-949.
M. ANBARASU, Mahmud ASHRAF. Structural behavior of intermediate length cold-formed steel rack columns with C-stitches. Front. Struct. Civ. Eng., 2019, 13(4): 937-949.
 链接本文:  
https://academic.hep.com.cn/fsce/CN/10.1007/s11709-019-0528-4
https://academic.hep.com.cn/fsce/CN/Y2019/V13/I4/937
Fig.1  
Fig.2  
Fig.3  
specimen
designation		 web (mm) flange (mm) depth of lip (bl) t L d/L
bw w1 w2 bf w3 w4 w5
1250-C0-D0 180.1 21.2 75.1 150 60.1 42.4 58.3 15.1 1.56 1251 1/6135
1250-C1-D50 180.1 21.3 75.0 149 60.2 42.3 58.2 15.0 1.56 1252 1/5833
1250-C2-D50 180.1 21.4 75.1 149 60.0 42.3 58.4 14.9 1.56 1251 1/5743
1250-C3-D50 179.9 21.1 75.2 148 60.0 42.3 58.3 14.8 1.56 1252 1/4484
1250-C4-D50 179.8 21.1 75.2 151 60.1 42.4 58.3 14.9 1.56 1253 1/4634
1250-C5-D50 180.1 21.2 74.9 151 60.0 42.4 58.4 14.8 1.56 1253 1/4530
1800-C0-D0 180.1 21.3 74.9 152 60.1 42.2 58.5 15.1 1.56 1801 1/3435
1800-C1-D50 180.2 21.2 74.8 151 60.2 42.3 58.3 15.2 1.56 1799 1/3236
1800-C2-D50 180.1 21.3 74.9 149 60.0 42.3 58.4 15.1 1.56 1801 1/4358
1800-C3-D50 180.1 21.2 74.9 151 60.0 42.4 58.3 15.1 1.56 1802 1/3535
Tab.1  
Fig.4  
Sl. No. thickness (mm) yield stress
fy(MPa)		 ultimate stress fu (MPa) modulus of
elasticity E (MPa)		 percentage of elongation
1 1.56 262.13 418.74 2.01 × 105 28.7
Tab.2  
Fig.5  
Fig.6  
test No. specimen designation PTEST (kN) failure mode PFEA (kN) PTEST / PFEA
1 1250-C0-D0 110.2 D 108.6 1.01
2 1250-C1-D50 143.6 D+ F 142.3 1.01
3 1250-C2-D50 144.2 L+ F 143.2 1.01
4 1250-C3-D50 148.2 L+ D 150.1 0.99
5 1250-C4-D50 152.4 L+ D 154.8 0.98
6 1250-C5-D50 154.3 L+ D 157.2 0.98
7 1800-C0-D0 88.1 D 92.2 0.96
8 1800-C1-D50 112.2 D 107.2 1.05
9 1800-C2-D50 126.4 D+ F 129.2 0.98
10 1800-C3-D50 130.6 D+ F 133.2 0.98
mean 0.99
Std. Dev 0.025
Tab.3  
Fig.7  
Fig.8  
Fig.9  
Fig.10  
Fig.11  
Fig.12  
Fig.13  
series base model C-stitches depth of C-stiches, D (mm)
percentage increase in resistance with respect to the base model
Nos. 25 50 75 100
1300 C0-D0 1 20.53 30.28 31.59 32.98
97.85 kN 2 19.79 30.02 27.88 32.64
3 22.20 34.93 40.18 42.35
4 23.56 39.77 44.14 48.56
5 24.53 45.01 51.86 55.75
1800 C0-D0 1 15.80 24.27 25.97 30.12
82.08kN 2 14.52 23.54 24.39 28.63
3 17.57 25.73 28.29 31.09
4 18.66 29.63 32.31 39.50
5 20.49 34.62 39.13 46.32
2300 C0-D0 1 7.01 10.78 10.95 12.57
68.76kN 2 3.82 4.90 7.18 15.04
3 10.05 13.89 17.44 18.64
4 12.78 16.39 22.45 24.97
5 15.29 21.84 27.39 30.13
2800 C0-D0 1 9.82 11.30 12.21 16.51
75.43kN 2 20.31 26.90 12.97 36.25
3 10.70 12.70 30.85 24.76
4 16.01 17.67 16.76 29.14
5 19.77 21.40 22.33 37.84
Tab.4  
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