Analytical study of concrete-filled steel tubular stub columns with double inner steel tubes

Document Type

Article

Publication Date

6-1-2023

Abstract

Concrete-filled steel tubular columns with double inner steel tubes (CFST-DIST) are a novel type of composite members developed from conventional concrete-filled steel tubular (CFST) columns. This paper investigates the structural performance of circular CFST-DIST stub columns using nonlinear finite element (FE) analysis. A numerical model was developed and verified against existing experimental test results. The validated model was then used to compare circular CFST-DIST stub columns' behavior with their concrete-filled double skin steel tubular (CFDST) and CFST counterparts. A parametric study was performed to ascertain the effects of geometric and material properties on the axial performance of CFST-DISTs. The FE results and the available test data were used to assess the accuracy of the European and American design regulations in predicting the axial compressive capacity of circular CFST-DIST stub columns. Finally, a new design model was recommended for estimating the compressive capacity of CFST-DISTs. Results clarified that circular CFST-DIST columns had the advantages of their CFST counterparts but with better ductility and strength-to-weight ratio. Besides, the investigated design codes led to conservative predictions of the compressive capacity of circular CFST-DIST columns.

Keywords

Composite structure, Concrete-filled, Finite element, Nonlinear analysis, Steel tubular column

Publication Title

Steel and Composite Structures

Divisions

sch_civ

Funders

National Natural Science Foundation of China (NSFC) [Grant No: 52278144]

Volume

47

Issue

5

Publisher

Techno-Press

Publisher Location

PO BOX 33, YUSEONG, DAEJEON 305-600, SOUTH KOREA

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