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Empirical Approach for Determining Axial Strength of Circular Concrete Filled Steel Tubular Columns

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Abstract

The concrete filled steel tubular (CFST) columns are highly regarded in recent years as an interesting option in the construction field by designers and structural engineers, due to their exquisite structural performance, with enhanced load bearing capacity and energy absorption capacity. This study presents a new approach to simulate the capacity of circular CFST columns under axial loading condition, using a large database of experimental results by applying artificial neural network (ANN). A well trained network is established and is used to simulate the axial capacity of CFST columns. The validation and testing of the ANN is carried out. The current study is focused on proposing a simplified equation that can predict the ultimate strength of the axially loaded columns with high level of accuracy. The predicted results are compared with five existing analytical models which estimate the strength of the CFST column. The ANN-based equation has good prediction with experimental data, when compared with the analytical models.

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Abbreviations

Ac :

Area of the concrete section

Ay :

Area of the steel section

D:

Diameter of circular cross-section

t:

The thickness of the steel tube

fy :

Yield strength of the steel tube

Ea :

Modulus of elasticity of steel

fck :

The characteristic concrete strength

Ec :

The secant modulus of elasticity of concrete

L:

The length of the column

fconf :

Confined compressive strength of concrete

ηc :

The coefficient of confinement of concrete

fcp :

Unconfined compressive strength of concrete

ϒc :

Strength reduction factor introduced to the scale effect into consideration

\({\text{f}}_{\text{c}}^{{\prime }}\) :

The unconfined cylinder compressive strength of concrete

Dc :

Diameter of the core

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Acknowledgements

Technical supports for this study provided by the Department of Civil Engineering, National Institute of Technology, Tiruchirappalli, Tamil Nadu, India, is gratefully acknowledged. The authors thank Government of India, Ministry of Human Resource Development—Department of Higher Education, for the Ph.D. scholarship given to the research scholar to carry out the research work.

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  1. Department of Civil Engineering, National Institute of Technology, Tiruchirappalli, Tamil Nadu, India

    S. Jayalekshmi, J. S. Sankar Jegadesh & Abhishek Goel

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  1. S. Jayalekshmi
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  2. J. S. Sankar Jegadesh
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Correspondence to S. Jayalekshmi.

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Jayalekshmi, S., Jegadesh, J.S.S. & Goel, A. Empirical Approach for Determining Axial Strength of Circular Concrete Filled Steel Tubular Columns. J. Inst. Eng. India Ser. A 99, 257–268 (2018). https://doi.org/10.1007/s40030-018-0291-x

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