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An experimental programme on high-strength rectangular concrete-filled steel hollow section columns is reported. A total of 22 specimens were tested under concentric loading. The test variables include the material strengths (fy=495 MPa; fc′=60 and 89 MPa), cross-sectional aspect ratio (1.0–2.0) and volumetric steel-to-concrete ratio (0.13–0.17). Favourable ductility performance was observed for the...
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