TY - JOUR
T1 - Lateral torsional buckling of partially restrained beams of high strength S690 welded I-sections
AU - Wang, Kai
AU - Xiao, Meng
AU - Chung, Kwok Fai
AU - Nethercot, David A.
N1 - Funding Information:
The authors are grateful to the Research Grants Council of the Government of Hong Kong SAR for its financial support provided in Project Nos. PolyU 1526871/16E , 152231/17E and 152157/18E . The project leading to the publication of this paper was also partially funded by the Research Committee (Project No. RTZX and RJLY) of the Hong Kong Polytechnic University , and the Chinese National Engineering Research Centre for Steel Construction (Hong Kong Branch) (Project No. 1-BBY3 & 6). It should be noted that the Research Centre was jointly funded by the Innovation and Technology Funds of the Government of Hong Kong SAR and the Hong Kong Polytechnic University. Special thanks go to the Nanjing Iron and Steel Co. Ltd. in Nanjing for supply of the high strength S690 steel plates, and the Pristine Steel Fabrication Co. Ltd. in Dongguan for fabrication of the S690 steel welded I-sections. All the experiments were carried out at the Structural Engineering Research Laboratory of Department of Civil and Environmental Engineering at the Hong Kong Polytechnic University, and supports from the technicians in testing of all the steel beams were highly appreciated.
Funding Information:
The authors are grateful to the Research Grants Council of the Government of Hong Kong SAR for its financial support provided in Project Nos. PolyU 1526871/16E, 152231/17E and 152157/18E. The project leading to the publication of this paper was also partially funded by the Research Committee (Project No. RTZX and RJLY) of the Hong Kong Polytechnic University, and the Chinese National Engineering Research Centre for Steel Construction (Hong Kong Branch) (Project No. 1-BBY3 & 6). It should be noted that the Research Centre was jointly funded by the Innovation and Technology Funds of the Government of Hong Kong SAR and the Hong Kong Polytechnic University. Special thanks go to the Nanjing Iron and Steel Co. Ltd. in Nanjing for supply of the high strength S690 steel plates, and the Pristine Steel Fabrication Co. Ltd. in Dongguan for fabrication of the S690 steel welded I-sections. All the experiments were carried out at the Structural Engineering Research Laboratory of Department of Civil and Environmental Engineering at the Hong Kong Polytechnic University, and supports from the technicians in testing of all the steel beams were highly appreciated.
Publisher Copyright:
© 2021
PY - 2021/9
Y1 - 2021/9
N2 - This paper reports a systematic experimental investigation into the structural behaviour of a total of eighteen simply supported beams of high strength S690 welded I-sections with various restraint conditions, focussing on lateral torsional buckling. Deformation characteristics of these beams, critical failure modes and moment resistances, are fully presented and discussed. In general, these beams of S690 welded I-sections were found to behave in an essentially similar manner to beams of S355 I-sections. Lateral torsional buckling in these beams was thoroughly assessed and compared with the predictions of EN1993-1-1 using their non-dimensionalized slenderness, determined using the procedures of EN 1993-1-1, and measured mechanical properties, geometrical dimensions and restraint conditions. It was demonstrated that the codified design rules were very conservative when being extended to cover these beams of S690 welded I-sections. This comprehensive experimental investigation provides scientific evidence and test data that highlights a need to improve structural efficiency of the design rules in EN 1993-1-1 so that structural engineers can fully exploit the structural benefits offered by these high strength S690 steels in construction.
AB - This paper reports a systematic experimental investigation into the structural behaviour of a total of eighteen simply supported beams of high strength S690 welded I-sections with various restraint conditions, focussing on lateral torsional buckling. Deformation characteristics of these beams, critical failure modes and moment resistances, are fully presented and discussed. In general, these beams of S690 welded I-sections were found to behave in an essentially similar manner to beams of S355 I-sections. Lateral torsional buckling in these beams was thoroughly assessed and compared with the predictions of EN1993-1-1 using their non-dimensionalized slenderness, determined using the procedures of EN 1993-1-1, and measured mechanical properties, geometrical dimensions and restraint conditions. It was demonstrated that the codified design rules were very conservative when being extended to cover these beams of S690 welded I-sections. This comprehensive experimental investigation provides scientific evidence and test data that highlights a need to improve structural efficiency of the design rules in EN 1993-1-1 so that structural engineers can fully exploit the structural benefits offered by these high strength S690 steels in construction.
KW - High strength steels
KW - Lateral torsional buckling
KW - Non-dimensionalized slenderness
KW - Partially restrained beams
KW - Welded sections
UR - http://www.scopus.com/inward/record.url?scp=85108078361&partnerID=8YFLogxK
U2 - 10.1016/j.jcsr.2021.106777
DO - 10.1016/j.jcsr.2021.106777
M3 - Journal article
AN - SCOPUS:85108078361
SN - 0143-974X
VL - 184
JO - Journal of Constructional Steel Research
JF - Journal of Constructional Steel Research
M1 - 106777
ER -