Experimental and Numerical Investigation on Global Buckling of Q690 High Strength Steel Tubes under Axial Compression

Due to the excellent bearing capacity, high-strength steel (yield stress ≥ 460 MPa) is gradually utilized in the design of super high-rise buildings, long-span bridges and other important structures to reduce section size and self-weight. In the present study, the axial compression test and numerica...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2020-03, Vol.774 (1), p.12081
Main Authors: Sun, Shuchang, You, Qiang, Gu, Xin, Peng, Yiliang
Format: Article
Language:English
Subjects:
Axial compression
Axial stress
Bearing capacity
Buckling
Compression tests
Compressive strength
Diameters
Finite element method
High rise buildings
High strength steel
High strength steels
Mathematical analysis
Mathematical models
Numerical models
Residual stress
Slenderness ratio
Stability
Steel tubes
Thickness ratio
Yield stress
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Summary:Due to the excellent bearing capacity, high-strength steel (yield stress ≥ 460 MPa) is gradually utilized in the design of super high-rise buildings, long-span bridges and other important structures to reduce section size and self-weight. In the present study, the axial compression test and numerical simulation were carried out to investigate the global buckling of high strength steel tubes. Eighteen specimens of Q690 high strength circular steel welded tubes were tested under axial compression to obtain the ultimate bearing capacity and buckling mode. An effective finite element numerical model incorporating the residual stress and geometric imperfection was established to analyse the influence of slenderness ratio, diameter thickness ratio and residual stress on the global stability coefficient. According to the calculation results, the column curve of Q690 circular steel tube was obtained and compared with three different codes. Finally, a formula to calculate the global stability coefficient of Q690 welded circular steel tubes was suggested.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/774/1/012081