Abstract
This study numerically explored the torsional behavior of circular concrete-filled steel tubes (CFST) under pure torsion. Numerical models of CFSTs were developed in ABAQUS. The models were validated by comparing with the experimental results available in the literature; then, these models were used for parametric study. Based on the obtained results, the mechanism of torsional moment transferring from steel plates to CFST was presented. The results obtained from the parametric study indicated that the compressive strength of concrete marginally improved the torsional moment capacity of the CFST while concrete prevented buckling and helped the steel tubes to work more effectively. The steel strength significantly affected the torsional moment capacity of the CFST. When the yield strength of steel increased from 235 to 420 MPa, the yield torsional moment of the CFST increased by approximately 50%. The yield torsional moment capacity of the steel tube had the strongest correlation with the yield moment of the CFST, followed by the ratio of diameter to thickness of the steel tube while the parameters related to the compressive strength of concrete exhibited a poor correlation with the yield torsional moment.
Highlights
Compared to conventional reinforced concrete, concrete-filled steel tubes (CFST)demonstrate several favorable characteristics during the construction and operational phases
Diverse materials have been used to fabricate CFSTs, such as normal/high strength steel [12,13] or stainless steel [14,15]; concrete made of recycled aggregate [3,16,17] or dune sand [18]; and normal [7] or high [2,19,20,21] strength concrete
The results indicated that CFST columns exhibited a significantly higher torsional strength compared with plain concrete columns
Summary
Compared to conventional reinforced concrete, concrete-filled steel tubes (CFST). demonstrate several favorable characteristics during the construction and operational phases. Lee et al [28] theoretically explored the behavior of CFSTs under torsion-compression combinations and found that the plastic torsional deformation capacity of CFSTs was large, while strength degradation was not observed as the infill concrete prevented local buckling for steel tubes. Based on the obtained results, formulas for the ultimate strength were proposed These loading combinations were used to study the performance of reinforced columns confined by steel tubes [32], reinforced concrete bridge piers [33], concrete-encased CFSTs [34], and CFRP-confined CFST columns [35]. The seismic performance of circular CFDSTs was much better compared to that of square/rectangular CFDSTs. Ding et al [40,41] numerically studied the influence of several parameters on the torsional behaviours of rectangular [40] and circular [41] CFSTs subjected to pure torsional moment. The objective of this study was to numerically investigate the behavior of CFSTs under pure torsion
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