Abstract

A numerical modelling programme simulating the structural behaviour of concrete-filled double skin tubular (CFDST) stub columns with stainless steel outer tubes and high strength steel inner tubes is presented in this paper. The numerical model, which was developed using the finite element package ABAQUS, was initially validated against existing experimental results considering ultimate load, load-deflection histories and failure modes, with good agreement observed. Upon validation of the FE model, an extensive parametric study was undertaken whereby the cross-section slendernesses of the outer and inner tubes, the strength of the inner tube and the concrete grades were varied. These generated results together with the experimental data were then employed to assess the suitability of the design provisions of the European Standard EN 1994-1-1 and American Specification for concrete-filled tubes. Modifications to these design rules are also proposed, and a reduction factor (η) is suggested to account for the effective compressive strength in high strength concrete.

Highlights

  • Concrete-filled double skin tubular (CFDST) sections comprise two metal tubes—an outer tube and an inner tube—with concrete sandwiched between the tubes

  • A numerical modelling programme simulating the structural behaviour of concrete-filled double skin tubular (CFDST) stub columns with stainless steel outer tubes and high strength steel inner tubes is presented in this paper

  • The accuracy of the finite element (FE) model was evaluated by comparing the ultimate loads, full loaddeformation histories and failure modes obtained from tests with those derived from the numerical simulations

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Summary

Introduction

The experimental investigation into the structural performance of CFDST stub columns conducted by the authors is reported in [2]. A total of 14 tests was carried out on the CFDST stub columns with circular hollow section (CHS) stainless steel outer tubes and CHS high strength. Owing to the expense and impracticality of generating comprehensive data through experimentation, a numerical study was undertaken in parallel with the laboratory testing programme. The general purpose finite element (FE) analysis package ABAQUS [5] was employed throughout the study. The model generated from ABAQUS was validated against the experimental results of [2] by comparing ultimate loads, load-deformation histories and failure modes. Once satisfactory agreement between the experimental and numerical results was achieved, an extensive parametric study comprising 239 simulations was conducted to investigate the influence of key variables

Description of finite element model
Validation of FE model
Parametric studies
General
American specification AISC 360
Modification to design rules
Findings
Conclusions
Full Text
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