Axial compressive stability design of longitudinal asymmetrical shuttle-shaped columns

• Published in: Journal of Building Engineering Vol. 89; p. 109202
• Main Authors: Zhao, Xiang-Yu, Guo, Yan-Lin, Wen, Chen-Bao
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 15.07.2024
• Subjects: Axial compressive stability; Design methods; Elastic buckling; Shuttle columns; Variable cross-section members; Axial compressive stability; Variable cross-section members; Design methods; Shuttle columns; Elastic buckling
• ISSN: 2352-7102; 2352-7102
• DOI: 10.1016/j.jobe.2024.109202

Longitudinal asymmetrical shuttle-shaped column (LA-SSC) has found its wide application when subjected to combined axial compression and horizontal point load in practical engineering. This paper focuses on elastic and elasto-plastic buckling behaviors of the LA-SSC only under axial compression and the resulting outcome could provide an indispensable basis for further establishing buckling strength prediction of LA-SSC under axial compression and horizontal point load. At first, the elastic buckling behavior of tapered columns (TC) and longitudinal symmetrical shuttle-shaped columns (LS-SSC) are derived in theory and verified by finite element numerical results, and corresponding elastic buckling modes are discussed. Subsequently the elastic buckling load prediction of LA-SSCs is established first and the corresponding normalized slender ratio, as a key design parameter, is generalized. Finally, the stability capacity of LA-SSCs is involved in theoretical analysis and finite element (FE) numerical calculation under axial pressure. Through investigating the axial load-lateral displacement curves and axial stress distributions the buckled LA-SSCs, the effects of different parameters (such as overall length, plate thickness, and steel strength) on the axial compression stability capacity of LS-SSCs are explored. As a result, the complete design formulas for axial compression stability capacity of LA-SSCs are presented first and compared with current major design codes in various countries. It is observed that the proposed strength design formulas are in good correspondence with the FE numerical results. The proposed formulas could provide references and guidance for the axial compression buckling strength of LA-SSCs under axial compression and they further supply fundamentals for establishing the strength design recommendation of LA-SSCs under axial compression and bending moments. [Display omitted] •Longitudinal asymmetric shuttle-shaped columns are mechanically superior.•The shuttle-shaped form contributes significantly to the elastic buckling loads.•The ultimate strength factor φ is established by using numerical examples.•Both sectional strength failure and global stability failure are considered.