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A platform for research: civil engineering, architecture and urbanism
Torsional behaviour of tapered concrete-filled double-skin steel tubular columns with large hollow ratios
https://orcid.org/0000-0003-4039-3112
Abstract Tapered concrete-filled double-skin steel tubular columns with large hollow ratios (LHR-CFDSTs) possess light self-weight and good lateral rigidity. They exhibit tremendous potential in lateral load-critical structures, including large-span buildings, wind turbine towers and offshore infrastructures. In these structures, in addition to axial force and bending moment, columns are also commonly subjected to considerable torque. Although the compressive/flexural behaviour of tapered LHR-CFDST columns has attracted attention from researchers, studies on the torsional performance and mechanism are limited. This paper thus presents a comprehensive analytical study on the torsional behaviour of tapered LHR-CFDST columns on the basis of previous experimental research. Numerical analyses were conducted to investigate the influence of the key parameters. Full-range torsional characteristics of the column were revealed with regard to the typical torque–torsional angle relation, the stress development of the concrete and the contact between components. Load distributions as well as the effective twist length were discussed to understand the mechanism of the column under torsion. It is found that significant torsional deformation, oblique concrete cracks and struts, the compressive stress of concrete and the contact pressure all develop concentratedly within the effective twist length, which reflects the segments of the tapered column with a relatively weak torsion-resistant ability. Lastly, a torsional capacity prediction method was proposed by refining the previous theoretical model and it exhibits favourable accuracy for tapered LHR-CFDST columns with tapered angles higher than 1.50°.
Highlights Comprehensive numerical models of tapered LHR-CFDST columns are developed and verified. Parametric effects and full-range torsional behaviour are analysed. Load distribution and effective twist length are discussed to reveal torsional mechanism. A refined torsional capacity prediction method of tapered LHR-CFDST columns is proposed.
Torsional behaviour of tapered concrete-filled double-skin steel tubular columns with large hollow ratios
https://orcid.org/0000-0003-4039-3112
Abstract Tapered concrete-filled double-skin steel tubular columns with large hollow ratios (LHR-CFDSTs) possess light self-weight and good lateral rigidity. They exhibit tremendous potential in lateral load-critical structures, including large-span buildings, wind turbine towers and offshore infrastructures. In these structures, in addition to axial force and bending moment, columns are also commonly subjected to considerable torque. Although the compressive/flexural behaviour of tapered LHR-CFDST columns has attracted attention from researchers, studies on the torsional performance and mechanism are limited. This paper thus presents a comprehensive analytical study on the torsional behaviour of tapered LHR-CFDST columns on the basis of previous experimental research. Numerical analyses were conducted to investigate the influence of the key parameters. Full-range torsional characteristics of the column were revealed with regard to the typical torque–torsional angle relation, the stress development of the concrete and the contact between components. Load distributions as well as the effective twist length were discussed to understand the mechanism of the column under torsion. It is found that significant torsional deformation, oblique concrete cracks and struts, the compressive stress of concrete and the contact pressure all develop concentratedly within the effective twist length, which reflects the segments of the tapered column with a relatively weak torsion-resistant ability. Lastly, a torsional capacity prediction method was proposed by refining the previous theoretical model and it exhibits favourable accuracy for tapered LHR-CFDST columns with tapered angles higher than 1.50°.
Highlights Comprehensive numerical models of tapered LHR-CFDST columns are developed and verified. Parametric effects and full-range torsional behaviour are analysed. Load distribution and effective twist length are discussed to reveal torsional mechanism. A refined torsional capacity prediction method of tapered LHR-CFDST columns is proposed.
Torsional behaviour of tapered concrete-filled double-skin steel tubular columns with large hollow ratios
https://orcid.org/0000-0003-4039-3112
Abstract Tapered concrete-filled double-skin steel tubular columns with large hollow ratios (LHR-CFDSTs) possess light self-weight and good lateral rigidity. They exhibit tremendous potential in lateral load-critical structures, including large-span buildings, wind turbine towers and offshore infrastructures. In these structures, in addition to axial force and bending moment, columns are also commonly subjected to considerable torque. Although the compressive/flexural behaviour of tapered LHR-CFDST columns has attracted attention from researchers, studies on the torsional performance and mechanism are limited. This paper thus presents a comprehensive analytical study on the torsional behaviour of tapered LHR-CFDST columns on the basis of previous experimental research. Numerical analyses were conducted to investigate the influence of the key parameters. Full-range torsional characteristics of the column were revealed with regard to the typical torque–torsional angle relation, the stress development of the concrete and the contact between components. Load distributions as well as the effective twist length were discussed to understand the mechanism of the column under torsion. It is found that significant torsional deformation, oblique concrete cracks and struts, the compressive stress of concrete and the contact pressure all develop concentratedly within the effective twist length, which reflects the segments of the tapered column with a relatively weak torsion-resistant ability. Lastly, a torsional capacity prediction method was proposed by refining the previous theoretical model and it exhibits favourable accuracy for tapered LHR-CFDST columns with tapered angles higher than 1.50°.
Highlights Comprehensive numerical models of tapered LHR-CFDST columns are developed and verified. Parametric effects and full-range torsional behaviour are analysed. Load distribution and effective twist length are discussed to reveal torsional mechanism. A refined torsional capacity prediction method of tapered LHR-CFDST columns is proposed.
Torsional behaviour of tapered concrete-filled double-skin steel tubular columns with large hollow ratios
Deng, Ran (author) / Zhou, Xu-Hong (author) / Wen, Hao (author) / Li, Rong-Fu (author) / Ji, Wei-Dong (author) / Wang, Yu-Hang (author) / Ren, Wei (author)
Thin-Walled Structures ; 183
2022-11-02
Article (Journal)
Electronic Resource
English
Behaviour of tapered concrete-filled double skin steel tubular (CFDST) stub columns
| Online Contents | 2012