The influence of circumferential debonding gap (CDG) on the mechanical performance of axially loaded concrete-filled steel tubular (CFST) columns with different slenderness ratios has to be carefully understood. To investigate it, finite element models (FEMs) of axially loaded CFST columns with or without CDG were implemented in the software ABAQUS. The FEM accuracy was verified by experimental results reported in the literature. Based on the calibrated FEMs, the influence of different slenderness ratios on the load-displacement relationship curves, lateral deflections, and stress-strain relationship curves of columns with or without CDG were analyzed. The results show that the influence of CDG on the lateral deflections of columns with different slenderness ratios is not obvious. The ultimate load-bearing capacity, ductility, and stress of columns with different slenderness ratios decreased due to CDG. With an increase in the slenderness ratio, the decrement due to CDG decreased. It is because the moment when the interaction between the steel tube and core concrete tends to be postponed due to the influence of CDG. With an increase in the slenderness ratio, the influence of CDG on the interaction stress between the steel tube and core concrete decreased.
Influence of slenderness ratios on mechanical performance of axially loaded CFST columns with circumferential debonding gap / Xue, J. Q.; Sun, J. G.; Briseghella, B.; Chen, B. C.; Wei, J. G.. - (2023), pp. 1449-1455. (Intervento presentato al convegno 11th International Conference on Bridge Maintenance, Safety and Management, IABMAS 2022 tenutosi a esp nel 2022) [10.1201/9781003322641-176].
Influence of slenderness ratios on mechanical performance of axially loaded CFST columns with circumferential debonding gap
Briseghella B.;
2023
Abstract
The influence of circumferential debonding gap (CDG) on the mechanical performance of axially loaded concrete-filled steel tubular (CFST) columns with different slenderness ratios has to be carefully understood. To investigate it, finite element models (FEMs) of axially loaded CFST columns with or without CDG were implemented in the software ABAQUS. The FEM accuracy was verified by experimental results reported in the literature. Based on the calibrated FEMs, the influence of different slenderness ratios on the load-displacement relationship curves, lateral deflections, and stress-strain relationship curves of columns with or without CDG were analyzed. The results show that the influence of CDG on the lateral deflections of columns with different slenderness ratios is not obvious. The ultimate load-bearing capacity, ductility, and stress of columns with different slenderness ratios decreased due to CDG. With an increase in the slenderness ratio, the decrement due to CDG decreased. It is because the moment when the interaction between the steel tube and core concrete tends to be postponed due to the influence of CDG. With an increase in the slenderness ratio, the influence of CDG on the interaction stress between the steel tube and core concrete decreased.
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