Portal Frames with a Novel Cold-Formed Tapered Box-Section

Abstract:

This paper introduces a novel steel portal frame system, in which cold-formed nested tapered box members are used in the design. The bird and dust proofing features of the system make it useful for applications where clean work areas are required, such as food, storage, and manufacturing industries. The new section used in the portal frames comprises two cold-formed channels welded to each other, forming a box-shaped steel member, either tapered or prismatic along its length. Such sections possess high torsional stiffness compared with the conventional I-sections; therefore, lateral bracing employed for the flexural-torsional buckling suppression of I section portal frames is mostly unnecessary. A comparative study, taking into account the cost of steel, painting, bird proofing and lateral bracing, is conducted between a number of portal frames with the proposed box-sections and the conventional I-sections. An analysis and design code, incorporating the Genetic Algorithm (GA), is developed to optimise the weight of the designed frames. The results indicate that the novel portal frame system is economically viable with additional benefits of bird and dust proofing. To investigate the failure modes and verify design procedure of the new portal frame, an experimental testing program is undertaken in University of Auckland. The test results show excellent behaviour and good agreement with the numerical models but have been completed too recently to be included in this paper.

• Periodical: Key Engineering Materials (Volume 763)
• Pages: 301-309
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.763.301
• Online since: February 2018
• Authors: Amir Shahmohammadi, James B.P. Lim, George Charles Clifton
• Keywords: Box-Section, Cold-Formed Steel, Full-Scale Test, Genetic Algorithm Software, Portal Frame

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