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The analysis of web opening configuration on cold-formed steel hat purlin under torsion behaviour

Ying Ling Jin (School of Civil Engineering, Universiti Sains Malaysia – Engineering Campus Seri Ampangan, Pulau Pinang, Malaysia)
Fatimah De’nan (School of Civil Engineering, Universiti Sains Malaysia – Engineering Campus Seri Ampangan, Pulau Pinang, Malaysia)
Kok Keong Choong (School of Civil Engineering, Universiti Sains Malaysia – Engineering Campus Seri Ampangan, Pulau Pinang, Malaysia)
Nor Salwani Hashim (School of Civil Engineering, Universiti Sains Malaysia – Engineering Campus Seri Ampangan, Pulau Pinang, Malaysia)

World Journal of Engineering

ISSN: 1708-5284

Article publication date: 9 January 2023

4

Abstract

Purpose

Cold-formed steel has been used extensively as secondary elements such as purlins and girts in building frames. Purlin is critical to the structure of the roof because it supports the weight of the roof deck and aids to make the entire roof structure more rigid. Furthermore, cold-formed steel purlin is a replacement for wood purlin because steel purlins are light weight and more economical. Hence, the purpose of this study to investigate the effect of opening due to torsion behaviour.

Design/methodology/approach

This analysis used cold-formed steel hat purlin with and without openings (WOs) under different opening shape, location and spacing by using finite element LUSAS software.

Findings

The finite element results showed that purlin with openings had higher angle of rotation than section WO, with a percentage difference of not more than 6%. When the opening was located at mid-span, the angle of rotation reduced. Angle of rotation increased when the opening spacing increased. Number of openings also affected the torsional behaviour of the purlin. Five opening shapes, which were circle, diamond, C-hexagon, square and elongated circle, were studied. Among all the shapes, purlin with diamond opening was more resistance to torsion.

Originality/value

The use of cold-formed steel section with web openings (rectangular or circular) is a practical solution when it is required to pass service ducts through the structural member. However, the presence of opening gives minor effect on the structural behaviour of cold-formed steel hat purlin.

Keywords

Acknowledgements

The authors convey heartfelt gratitude and highest appreciation to Universiti Sains Malaysia for the financial support by the Fundamental Research Grant Scheme [number 203/PAWAM/6071239].

Conflict of interests: The authors declare they have no conflict of interest.

Citation

Jin, Y.L., De’nan, F., Choong, K.K. and Hashim, N.S. (2023), "The analysis of web opening configuration on cold-formed steel hat purlin under torsion behaviour", World Journal of Engineering, Vol. ahead-of-print No. ahead-of-print. https://doi.org/10.1108/WJE-08-2022-0332

Publisher

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Emerald Publishing Limited

Copyright © 2022, Emerald Publishing Limited

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