City Research Online

Abstract

Experimental and numerical studies on flexural behaviour of rectangular double-opening concrete filled sandwich steel tube (DCFSST) beams were performed in this study. Six specimens under different cross-section of inner tube and nominal cross-sectional steel ratio (αn) were tested under bending to assess the failure modes, moment-displacement and moment-strain relationships, flexural capacity and flexural stiffness of rectangular DCFSST beams. The experimental results demonstrate that the two design variables investigated in this paper have limited impact on the failure modes of typical specimens. The failure mode of outer tube includes multiple local bulges on top flange and one case of fracture on bottom flange that is located at the same plane as the primary local bulge on top flange, whilst the failure mode of inner tubes is mainly due to excessive global deflection. Simultaneously, sandwich concrete is crushed at the locations with evident local bulge on outer tube and cracks nearly uniformly within the lower 2/3 section depth. In general, the flexural capacity and stiffness of the specimens enhance as

Publication Type:	Article
Additional Information:	© 2024. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/
Publisher Keywords:	Double-opening concrete filled sandwich steel tube (DCFSST); Rectangular section; Flexural behaviour; Tests; Finite element (FE) model; Simplified formulae
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TH Building construction
Departments:	School of Science & Technology School of Science & Technology > Engineering
SWORD Depositor:	Symplectic Administrator

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