Abstract
This study presents a comprehensive investigation of Q690 high strength steel (HSS) cold-formed round-ended oval hollow section (ROHS) stub columns subjected to concentric compression, utilising a combination of experimental and numerical analyses. Material properties were determined through tensile coupon tests. Residual stresses in both membrane and bending types were measured and recorded and their impact on structural behavior was evaluated. Initial local geometric imperfection measurements were conducted for all specimens. In addition to experimental studies, the numerical investigation was conducted to develop a finite element (FE) model of Q690 HSS cold-formed ROHS stub column. The accuracy of the FE model for HSS cold-formed ROHS stub column was validated through a comparison of the numerical predictions with the experimental test results. An extensive parametric study was conducted to produce structural performance data for HSS cold-formed ROHS with an expanded range of cross-sectional slenderness, aiming to enhance the existing data repository. The cross-sectional resistance of stub columns obtained from experimental and numerical investigations were compared with the design strengths predicted by the advanced design methods of Direct Strength Method (DSM) and Continuous Strength Method (CSM). The comparison indicate that the existing design methods provide over-conservative and unreliable cross-sectional resistance predictions. Modifications on DSM and CSM are proposed, based upon which notable improvements in cross-sectional resistance in predictions are obtained in a reliable manner.
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