Behavior of Q690 high-strength steel columns: Part 2: Parametric study and design recommendations

Prediction of the column strength, associated with buckling and material yielding, is vital in a successful design. In this paper, a completely numerical analysis technique is employed for simulating the compressive behavior of Q690 high-strength steel columns with box- and H-sections, and its accur...

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Bibliographic Details
Published in:Journal of constructional steel research 2016-07, Vol.122, p.379-394
Main Authors: Li, Tian-Ji, Liu, Si-Wei, Li, Guo-Qiang, Chan, Siu-Lai, Wang, Yan-Bo
Format: Article
Language:English
Subjects:
Buckling
Columns (structural)
Computer simulation
Design
Design analysis
High strength steels
High-strength steel
Imperfections
Mathematical models
Numerical analysis
Recommendations
Residual stress
Welded sections
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Summary:Prediction of the column strength, associated with buckling and material yielding, is vital in a successful design. In this paper, a completely numerical analysis technique is employed for simulating the compressive behavior of Q690 high-strength steel columns with box- and H-sections, and its accuracy is verified by the experimental results as presented in the part 1 of the companion papers. To this, the curved Pointwise-Equilibrating-Polynomial (PEP) is introduced for representing the column deformations with an explicit simulation on the member initial imperfection. Further, the refined plastic hinge model combined with the use of sectional yield surfaces is employed to reflect inelastic yielding at the critical location. A cross-sectional analysis approach allowing for residual stresses modeling is also incorporated into the numerical method. Sequentially, a parametric study is conducted extensively for the Q690 high-strength steel welded columns. At last, the buckling curves from Chinese (GB 50017-2003), European (Eurocode 3), and American (ANSI/AISC 360-10) codes are examined, and some recommendations for design of Q690 high-strength steel columns are presented. •A complete numerical analysis technique for Q690 high-strength steel columns is presented.•Accuracy of the numerical model is verified by the experimental results.•Influence of residual stress is directly reflected in the numerical model.•A parametric study is conducted extensively for the Q690 high-strength steel columns.•Design recommendations based on the parametric study for Q690 high-strength steel columns are given.
ISSN:0143-974X
1873-5983
DOI:10.1016/j.jcsr.2016.03.027