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Nonlinear analysis of square concrete-filled double-skin steel tubular columns under axial compression
Highlights The nonlinear finite element analysis of square CFDST short columns with an inner circular steel tube is conducted. A new material constitutive model for the concrete core confined by the square steel tube is described. A comprehensive parametric study on square CFDST columns is performed utilizing the verified numerical model. A new design equation is developed to predict the ultimate strengths of square CFDST columns with an inner circular steel tube is conducted.
Abstract This paper studies the characteristics of square concrete-filled double-skin steel tubular (CFDST) short columns with inner circular steel tube by performing a series of nonlinear finite element (FE) analysis. The precise definitions of the behavior of the material are the initial requirement of numerical modeling. The existing models for predicting the behavior of the concrete core confined by the circular tube are not suitable since the mechanism of the concrete confinement in square composite columns is different from that of the circular ones. Also, ignoring the confinement effects on improving the concrete strength may lead to conservative results. In this paper, the confinement effects provided by the steel tubes on the concrete core in square CFDST columns are taken into account in the concrete constitutive model. The verified FE model is utilized to investigate the effects of important parameters on the ultimate axial strength, energy absorption capacity, ductility, and interaction performance of CFDST columns. A new design equation is suggested based on stress distribution over the concrete cross-section. It is shown that material properties and dimensions of composite columns can highly affect their performance. Also, the thickness of the inner tube must be controlled to prevent its premature failure. Validation of the design equation shows that it leads to the satisfactory predictions of the ultimate strengths of square CFDST short columns under axial loading.
Nonlinear analysis of square concrete-filled double-skin steel tubular columns under axial compression
Highlights The nonlinear finite element analysis of square CFDST short columns with an inner circular steel tube is conducted. A new material constitutive model for the concrete core confined by the square steel tube is described. A comprehensive parametric study on square CFDST columns is performed utilizing the verified numerical model. A new design equation is developed to predict the ultimate strengths of square CFDST columns with an inner circular steel tube is conducted.
Abstract This paper studies the characteristics of square concrete-filled double-skin steel tubular (CFDST) short columns with inner circular steel tube by performing a series of nonlinear finite element (FE) analysis. The precise definitions of the behavior of the material are the initial requirement of numerical modeling. The existing models for predicting the behavior of the concrete core confined by the circular tube are not suitable since the mechanism of the concrete confinement in square composite columns is different from that of the circular ones. Also, ignoring the confinement effects on improving the concrete strength may lead to conservative results. In this paper, the confinement effects provided by the steel tubes on the concrete core in square CFDST columns are taken into account in the concrete constitutive model. The verified FE model is utilized to investigate the effects of important parameters on the ultimate axial strength, energy absorption capacity, ductility, and interaction performance of CFDST columns. A new design equation is suggested based on stress distribution over the concrete cross-section. It is shown that material properties and dimensions of composite columns can highly affect their performance. Also, the thickness of the inner tube must be controlled to prevent its premature failure. Validation of the design equation shows that it leads to the satisfactory predictions of the ultimate strengths of square CFDST short columns under axial loading.
Nonlinear analysis of square concrete-filled double-skin steel tubular columns under axial compression
Ayough, Pouria (author) / Ramli Sulong, N.H. (author) / Ibrahim, Zainah (author) / Hsiao, Po-Chien (author)
Engineering Structures ; 216
2020-04-16
Article (Journal)
Electronic Resource
English
Behaviour of square concrete-filled stiffened steel tubular stub columns under axial compression
| SAGE Publications | 2019