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Flexural behaviour of different CFSTs cross-section shapes with the same steel cross-sectional area

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Abstract

Concrete-filled steel tubes (CFSTs) have recently been used worldwide as both beams and columns. CFSTs have remarkable advantages as they are independent of the moulding process and there are no maintenance requirements of the infilled concrete. In this paper, the flexural performance of CFST beams which had rectangular, circular, and square cross-sections was investigated. All beams were equal cross-sectional area (1044 mm2) and the same wall thickness (3 mm). Four-point bending tests were performed on a total of twelve CFST beams including three different types of sections filled with concrete with a compressive strength of 40 MPa. Load/moment–displacement curves extracted from the experimental results were presented and discussed. Results showed that circular CFST beams exhibited higher flexural capacities than square and rectangular beams of the same cross-sectional areas. The obtained results were also compared with the theoretical flexural capacities predicted using the practical code provisions of AISC and EuroCode4 as well as the equation developed by Han. Finally, nonlinear finite element models (FEM) were developed using ABAQUS to simulate the experimental tests. The FEM is checked using current experimental results, and good compatibility has been reached on load/moment capacity and load/moment- displacement curves. Additionally, The FEM data were also used to conduct a parametric investigation involving a wider range of compressive and yield strengths.

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Abbreviations

fy :

Yield strength of steel tube

fc :

Compressive strength of concrete core

As :

Steel cross-sectional area

D:

Diameter of the steel tube

t:

Wall thickness of the steel tube

B:

Width of the steel tube

H:

Height of the steel tube

My :

Moment capacity at yield

Mu :

Moment capacity at ultimate

Dy :

Mid-span displacement at yield

Du :

Mid-span displacement at ultimate

Ki :

Initial stiffness

Ks :

Secant stiffness

µ:

Ductility index

WsB :

Plastic section modulus of steel

WcB :

Plastic section modulus of concrete

Wsn :

Plastic section modulus of steel

Wcn :

Plastic section modulus of concrete

Mneut :

Neutral moment (EC4)

Mmax :

Maximum moment (EC4)

Mn :

Flexural capacity of CFST beams (EC4)

MB :

Flexural strength for point B in the interaction diagram

MD :

Flexural strength for point D in the interaction diagram

PB :

Compressive strength for point B in the interaction diagram

wpc :

Plastic section modulus of concrete

wpa :

Plastic section modulus of steel tube

wpan :

Plastic section modulus of steel tube at 2hn

wpcn :

Plastic section modulus of concrete at 2hn

Ac :

Concrete cross-sectional area

hn :

The positions of the neutral axes

Mu :

Bending moment strength (Han)

fscy :

The yield strength of the composite section

Wscm :

Plastic section modulus of steel tube

γm :

Flexural strength index (Han)

ξ:

The confinement factor

MEXP :

Moment capacity at yield (experimental)

MAISC :

Moment capacity at yield (AISC)

MEC4 :

Moment capacity at yield (EC4)

MHAN :

Moment capacity at yield (Han)

My,NUM :

Moment capacity at yield (Numerical)

Mu,NUM :

Moment capacity at ultimate (Numerical)

CFST:

Concrete-filled steel tubes

FEM:

Finite element model

FEA:

Finite element analysis

FE:

Finite elements

AISC:

American Institute of Steel Construction

EC4:

Euro Code 4

CCS-IC:

Concrete-filled circular cross-section

CCS-H:

Hollow circular cross-section

RCS-IC:

Concrete-filled rectangular cross-section

RCS-H:

Hollow rectangular cross-section

SCS-IC:

Concrete-filled square cross-section

SCS-H:

Hollow square cross-section

LVDT:

Linear variable displacement transducers

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Acknowledgement

This study was produced from the master thesis number 648772 completed at KTO Karatay University Graduate Education Institute. And also, thanks to the ABAQUS Inc student version.

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Authors and Affiliations

  1. KTO Karatay University, 42020, Konya, Turkey

    Abdulkerim İlgün & Sadrettin Sancioğlu

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  1. Abdulkerim İlgün
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  2. Sadrettin Sancioğlu
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SS: Conceptualisation, investigation, writing—original draft writing—review and editing. Aİ: Investigation, supervision, methodology, funding acquisition.

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Correspondence to Abdulkerim İlgün.

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İlgün, A., Sancioğlu, S. Flexural behaviour of different CFSTs cross-section shapes with the same steel cross-sectional area. Sādhanā 48, 53 (2023). https://doi.org/10.1007/s12046-023-02101-7

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