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Effect of External Ring Stiffener on the Chord Members of Cold-Formed Steel T-Joints Under Combined Axial Compression and Bending

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A Correction to this article was published on 08 April 2024

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Abstract

This paper aims to study the experimental and analytical behaviour of cold-formed steel (CFS) T-joint members with or without external ring stiffeners under combined axial compression and bending. The parameters varied in the study include the type of T-joints (with and without ring stiffeners), spacing of the stiffeners (100 mm and 200 mm from the central axis of the T-Joint), and thickness of the ring stiffeners (4 mm and 6 mm). The load–deflection and load-strain behaviour were studied by measuring the overall deflection of the T-joints and strain using dial gauges and strain indicators, respectively. The load-carrying capacity of the T-joints with external ring stiffeners was compared, and the results of a numerical investigation showed good agreement. An extensive parametric study was carried out for different geometric parameters of the ring stiffener, chord, and brace member using the FE model to obtain the ultimate strength of the stiffened T-joints, and strength was also compared and obtained using the published equation. From the results of this investigation, it was found that the T-joints with external ring stiffeners can resist more strength and deformation when compared to the T-joints without external ring stiffeners.

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Abbreviations

CFS:

Cold-Formed Steel

CFHSS:

Cold-Formed High Strength Steel

CHS:

Circular Hollow Section

RHS:

Rectangular Hollow Section

TJ:

T-Joint

RS:

Ring Stiffener

UTM:

Universal Testing Machine

FEM:

Finite Element Method

tr :

The thickness of ring stiffener

ds :

Diameter of the ring stiffener

S:

Spacing of the ring stiffener from the edge of the brace member

d1 :

Diameter of the Brace

t1 :

The thickness of the brace member

l1 :

Length of the brace member

do :

Diameter of the chord member

to :

The thickness of the chord member

Eo :

Young’s modulus of the joint member

lo :

Length of the chord member

Es :

Young’s modulus of the ring stiffener

fy0 :

Yield stress of the joint member

fys :

Yield stress of the ring stiffener

β:

Diameter of the brace member to the diameter of the chord member

μ:

Spacing between ring stiffeners to the diameter of the brace member

λ:

Thickness of the ring stiffener to the thickness of the chord member

γ:

Half the ratio of the diameter of the chord member and its thickness

α:

Strength magnification factor

P:

Strength of the unstiffened joint capacity

Ps :

The axial capacity of the stiffened joint

Pexp :

Experimental Strength of the T-joint

δexp :

Experimental Maximum deflection of the T-joint

δFEA :

Analytical Maximum deflection of the T-joint

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Authors and Affiliations

  1. Department of Civil Engineering, Sri Sivasubramaniya Nadar College of Engineering, Chennai, Tamil Nadu, 603 110, India

    P. Sangeetha, Harika Madireddy, B. Varshini & R. B. Yokesh

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  1. P. Sangeetha
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  2. Harika Madireddy
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  3. B. Varshini
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  4. R. B. Yokesh
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Contributions

Conceptualization, Methodology, Visualization and review P. Sangeetha, Software & Validation, Harika Madireddy, Varshini B and Yokesh R B.

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Correspondence to P. Sangeetha.

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Sangeetha, P., Madireddy, H., Varshini, B. et al. Effect of External Ring Stiffener on the Chord Members of Cold-Formed Steel T-Joints Under Combined Axial Compression and Bending. Int J Steel Struct 24, 296–309 (2024). https://doi.org/10.1007/s13296-024-00816-9

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