Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Meso-scale modeling of size effect in eccentrically-loaded squared CFST columns: Influence of eccentricity and confinement effect
Abstract The objective of the present study is to study the failure and size effect of squared concrete-filled steel tubular (CFST) columns subjected to eccentric loading. To model the failure of squared CFST stub columns, a three-dimensional meso-scale simulation approach taking into consideration of both concrete heterogeneity and the concrete–steel tube interaction was established. The meso-scale method was first verified by comparing the simulation results with the available test ones. The verified numerical model was then employed to perform the investigations on the influence of load eccentricity ratio ranging from 0.1 to 0.9 and confinement effect on the failure mode and nominal strength of squared CFST stub columns having the constant slender ratio of 3.0 and having different structural sizes (i.e. 200 mm, 400 mm, and 800 mm). The simulation results indicate that, as the magnitude of the eccentricity increases, the failure mode of squared CFST stub columns changes from brittle compression-shear failure to ductile bending failure, making the size effect on nominal compressive strength be weakened. Moreover, as the confinement effect described by confinement coefficient arises, the nominal strength as well as the ductility of CFST columns improve and the corresponding size effect is also weakened. Finally, a simplified model of axial force–bending moment (N-M) interaction curve for predicting the bearing capacity of squared CFST stub columns was proposed considering the influence of structural size, which can provide conservative predictions when compared to the simulated results.
Highlights A 3D meso-scale method of eccentrically-loaded CFST column is established. Influence of eccentricity and confinement on size effect of CFST column is explored. A simplified model for predicting the bearing capacity of CFST column is proposed.
Meso-scale modeling of size effect in eccentrically-loaded squared CFST columns: Influence of eccentricity and confinement effect
Abstract The objective of the present study is to study the failure and size effect of squared concrete-filled steel tubular (CFST) columns subjected to eccentric loading. To model the failure of squared CFST stub columns, a three-dimensional meso-scale simulation approach taking into consideration of both concrete heterogeneity and the concrete–steel tube interaction was established. The meso-scale method was first verified by comparing the simulation results with the available test ones. The verified numerical model was then employed to perform the investigations on the influence of load eccentricity ratio ranging from 0.1 to 0.9 and confinement effect on the failure mode and nominal strength of squared CFST stub columns having the constant slender ratio of 3.0 and having different structural sizes (i.e. 200 mm, 400 mm, and 800 mm). The simulation results indicate that, as the magnitude of the eccentricity increases, the failure mode of squared CFST stub columns changes from brittle compression-shear failure to ductile bending failure, making the size effect on nominal compressive strength be weakened. Moreover, as the confinement effect described by confinement coefficient arises, the nominal strength as well as the ductility of CFST columns improve and the corresponding size effect is also weakened. Finally, a simplified model of axial force–bending moment (N-M) interaction curve for predicting the bearing capacity of squared CFST stub columns was proposed considering the influence of structural size, which can provide conservative predictions when compared to the simulated results.
Highlights A 3D meso-scale method of eccentrically-loaded CFST column is established. Influence of eccentricity and confinement on size effect of CFST column is explored. A simplified model for predicting the bearing capacity of CFST column is proposed.
Meso-scale modeling of size effect in eccentrically-loaded squared CFST columns: Influence of eccentricity and confinement effect
Jin, Liu (Autor:in) / Fan, Lingling (Autor:in) / Du, Xiuli (Autor:in)
Thin-Walled Structures ; 169
13.09.2021
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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