Abstract
The high-strength steel (HSS) has been used in steel–concrete composite constructions as it is beneficial for improving structural performance and reducing structural self-weight. This study presents experimental and numerical studies on the bending behaviour of concrete-filled double-skin tubular (CFDST) beams using the HSS with yield strength of 618 MPa. The results showed that the bending resistance of CFDST member was substantially increased and the high strength material was fully exploited. A parametric study was performed using the verified finite element model. In addition, the compatibility of various concrete classes and steel grades was discussed. The design methods from current code of practice were also evaluated for the prediction of bending resistance of circular CFDST beams using HSS tube.
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