An overview study on cross-section classification of steel H-sections

• Published in: Journal of constructional steel research 2013-01, Vol.80, p.386-393
• Main Authors: Chen, Yiyi, Cheng, Xin, Nethercot, David A.
• Format: Article
• Language: English
• Subjects: Cross-section classification; Design rules; H-section; Local buckling; Seismic design; Web–flange interaction; Width–thickness ratio
• ISSN: 0143-974X; 1873-5983
• DOI: 10.1016/j.jcsr.2012.10.006

A review is made of the treatment of cross-sectional classification in four major current design specifications (Eurocode, AISC, AIJ and Chinese Codes) including both the non-seismic and seismic cases. Three rules, namely ‘individual plate rule’, ‘limited load pattern rule’ and ‘monotonic rule’ are present in most of the specifications but these rules neglect the effect of some important interactive behavior. A review of the research base, paying particular attention to interactive effects and design criteria under complex load patterns, provides sufficient evidence for the conclusion that web–flange interaction, the axial force ratio, different bending axes and cyclic loading are significant features that influence cross-sectional behavior but have received little consideration. Thus, the necessity for current specifications to improve those rules has been highlighted. Finally the paper assesses the needs for future research to effect the significant improvements that would appear to be necessary for classifying cross-sections. ► Treatments of cross-sectional classification in four design specifications are compared. ► Difference and shortcomings of specifications are investigated. ► Review for the mechanical and physical background of cross-section resistance is provided. ► The value to consider web-flange interaction is highlighted.