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A platform for research: civil engineering, architecture and urbanism
Axial compressive behaviour of CFDST stub columns with large void ratio
Abstract This paper describes the experimental and numerical study on the axial compressive behaviour of circular-in-circular concrete-filled double-skin steel tube (CFDST) stub columns with large void ratio. Nine specimens with various void ratio (R v), diameter-to-thickness ratio of outer tube (D o/t o) and compressive strength of concrete (f cu) were tested under axial compression. The failure patterns, load versus displacement (strain) relationship, ultimate capacity and elastic composite stiffness of the specimens were investigated. The experimental results show that all specimens have good structural performance. The typical failure patterns of this new type of columns include local buckling of outer or inner tubes and crushing of concrete infill at the primary buckling locations of both tubes. It is observed from the tests that, there are three key stages in the load versus displacement (strain) relationship, namely: approximative elastic, elastoplastic and nonlinear post-peak, and with the augment of R v and D o/t o and the reduce of f cu, the ultimate capacity and elastic composite stiffness of the specimens decrease. Apart from tests, a finite element (FE) model was developed to further study the axial compressive behaviour of circular-in-circular CFDST stub columns with large void ratio, and the model was validated against the experimental results. Finally, a simplified analytical model to predict the ultimate capacity of circular-in-circular CFDST stub columns with large void ratio was developed, and the accuracy of the model was verified by the available experimental results. It can be used by the practising engineers in the future design of this type of columns.
Graphical abstract In this paper, we experimentally and numerically investigate the axial compressive behaviour of circular-in-circular CFDST stub columns with large void ratio (i.e. from 0.8 to 0.9). Finally, we suggest a simplified analytical model to predict the ultimate capacity of circular-in-circular CFDST stub columns with large void ratio on the basis of systematic parametric study using the finite element (FE) model, and the accuracy of the model is verified by comparison with numerical and the available experimental results. Display Omitted
Highlights New axial compressive tests on circular CFDST stub columns with void ratio of 0.8–0.9. FE model for axially compressed circular CFDST stub columns with large void ratio. Simplified analytical model for the ultimate capacity of circular CFDST stub columns with large void ratio.
Axial compressive behaviour of CFDST stub columns with large void ratio
Abstract This paper describes the experimental and numerical study on the axial compressive behaviour of circular-in-circular concrete-filled double-skin steel tube (CFDST) stub columns with large void ratio. Nine specimens with various void ratio (R v), diameter-to-thickness ratio of outer tube (D o/t o) and compressive strength of concrete (f cu) were tested under axial compression. The failure patterns, load versus displacement (strain) relationship, ultimate capacity and elastic composite stiffness of the specimens were investigated. The experimental results show that all specimens have good structural performance. The typical failure patterns of this new type of columns include local buckling of outer or inner tubes and crushing of concrete infill at the primary buckling locations of both tubes. It is observed from the tests that, there are three key stages in the load versus displacement (strain) relationship, namely: approximative elastic, elastoplastic and nonlinear post-peak, and with the augment of R v and D o/t o and the reduce of f cu, the ultimate capacity and elastic composite stiffness of the specimens decrease. Apart from tests, a finite element (FE) model was developed to further study the axial compressive behaviour of circular-in-circular CFDST stub columns with large void ratio, and the model was validated against the experimental results. Finally, a simplified analytical model to predict the ultimate capacity of circular-in-circular CFDST stub columns with large void ratio was developed, and the accuracy of the model was verified by the available experimental results. It can be used by the practising engineers in the future design of this type of columns.
Graphical abstract In this paper, we experimentally and numerically investigate the axial compressive behaviour of circular-in-circular CFDST stub columns with large void ratio (i.e. from 0.8 to 0.9). Finally, we suggest a simplified analytical model to predict the ultimate capacity of circular-in-circular CFDST stub columns with large void ratio on the basis of systematic parametric study using the finite element (FE) model, and the accuracy of the model is verified by comparison with numerical and the available experimental results. Display Omitted
Highlights New axial compressive tests on circular CFDST stub columns with void ratio of 0.8–0.9. FE model for axially compressed circular CFDST stub columns with large void ratio. Simplified analytical model for the ultimate capacity of circular CFDST stub columns with large void ratio.
Axial compressive behaviour of CFDST stub columns with large void ratio
Yang, You-Fu (author) / Fu, Feng (author) / Bie, Xue-Meng (author) / Dai, Xiang-He (author)
2021-08-02
Article (Journal)
Electronic Resource
English
CFDST stub columns subjected to large deformation axial loading
| Online Contents | 2010
CFDST stub columns subjected to large deformation axial loading
| Elsevier | 2009