A design-based optimisation for pre-engineered steel frames comprising built-up sections is presented in this paper and the effect of unbraced length ratios on flange and web slenderness ratios is elaborated. A wide range of built-up sections was selected with different unbraced length ratios, web slenderness ratios and flange slenderness ratios. Web slenderness and flange slenderness were varied from a fairly compact range to highly slender values. The capacity of the design sections was determined using different design codes under the combined effect of compression and bending forces. The optimised values for flange and web slenderness were determined for each unbraced length ratio and a relationship between unbraced length and optimum flange slenderness values was established. Analysis of the results revealed that the use of appropriate values of flange and web slenderness in accordance with the member unbraced length can significantly reduce the section weight and improves its efficiency.
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August 2019
Research Article|
August 02 2018
Optimisation of flange and web slenderness for pre-engineered built-up steel sections
Muhammad Umair Saleem, PhD, PE;
Muhammad Umair Saleem, PhD, PE
Assistant Professor, Department of Civil and Environmental Engineering, King Faisal University, Hofuf, Saudi Arabia (corresponding author: mmsaleem@kfu.edu.sa)
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Nauman Khurram, PhD, PE;
Nauman Khurram, PhD, PE
Assistant Professor, Department of Civil Engineering, University of Engineering and Technology, Lahore, Pakistan
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Hisham Jahangir Qureshi, MSc;
Hisham Jahangir Qureshi, MSc
Lecturer, Department of Civil and Environmental Engineering, King Faisal University, Hofuf, Saudi Arabia
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Zaheer Abbas Kazmi, PhD;
Zaheer Abbas Kazmi, PhD
Assistant Professor, Department of Construction Engineering, College of Engineering, Imam Abdulraman Bin Faisal University, Dammam, Saudi Arabia
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Zahid Ahmad Siddiqui, PhD
Zahid Ahmad Siddiqui, PhD
Professor, Department of Civil Engineering, University of Lahore, Lahore, Pakistan
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Publisher: Emerald Publishing
Received:
November 09 2017
Accepted:
July 04 2018
Online ISSN: 1751-7702
Print ISSN: 0965-0911
ICE Publishing: All rights reserved
2018
Proceedings of the Institution of Civil Engineers - Structures and Buildings (2019) 172 (8): 599–608.
Article history
Received:
November 09 2017
Accepted:
July 04 2018
Citation
Saleem MU, Khurram N, Qureshi HJ, Kazmi ZA, Siddiqui ZA (2019), "Optimisation of flange and web slenderness for pre-engineered built-up steel sections". Proceedings of the Institution of Civil Engineers - Structures and Buildings, Vol. 172 No. 8 pp. 599–608, doi: https://doi.org/10.1680/jstbu.17.00186
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