Abstract
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.
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