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A Study on the Structural Behavior and the Strength of Circular Hollow Steel(CHS) Section Columns  

Kang, Doo Won (롯데건설, 토목사업부)
Kwon, Young Bong (영남대학교 건설시스템공학과)
Publication Information
Journal of Korean Society of Steel Construction / v.21, no.5, 2009 , pp. 505-514 More about this Journal
Abstract
This paper describes the structural behavior and the ultimate strengths of circular hollow steel (CHS) sections based on a series of compression tests. The ultimate strengths of CHS section columns are mainly dependent on both diameter-thickness ratio and column slenderness ratio. For the CHS sections with a high diameter-thickness ratio, an elastic or an inelastic local buckling may occur prior to the overall buckling, and it may decrease the column strength. Test sections were fabricated from SM400 steel plate of 2.8 mm and 3.2 mm in thickness and were tested to failure. The diameter-thickness ratios of the test sections ranged from 45 to 170 to investigate the effect of local buckling on the column strength. The compression tests indicated that the CHS sections of lower diameter-thickness ratio than the yield limit in the current design specifications showed an inelastic local buckling and a significant post-buckling strength in the local mode. Their ultimate stresses were larger than the nominal yield stress. It was known that the allowable stresses of the sections predicted by the Korean Highway Bridge Design Specifications (2005) were too conservative in comparison with test results. The Direct Strength Method which was newly developed was calibrated for application to the CHS sections by the experimental and numerical results. The Direct Strength Method proposed can predict properly the ultimate strength of CHS section columns whether a local buckling and an overall buckling occur nearly simultaneously or not.
Keywords
Compressive strength; circular hollow steel (CHS) sections; local buckling; overall buckling; diameter-thickness ratio; slenderness ratio; buckling interaction; direct strength method;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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