Assoc. Prof. Dr. Arizu Sulaiman
Cold-formed steel (CFS) sections are usually used as secondary elements in comparison to the hot-rolled steel (HRS) sections. This may be due to the fact that typical cross sections of CFS sections are light and thin which in turn create a perception that CFS sections would not be able to sustain larger loadings. However, through the advent of researches and innovations, nowadays, this cold perception may no longer be true. This keynote paper is intended to show some of the efforts and few of the potential usages of CFS sections. A scenario of light-gauge construction of a house is demonstrated. In comparison to the conventional construction, the construction of the house using CFS sections is found out to be more efficient in terms of the reduction in time and cost. In addition, a few evaluations of experimental works carried out at the Universiti Teknologi Malaysia are also presented. The findings can provide some insights to the ability of CFS sections to be utilized as main load carrying elements or components. The first is the experimental investigation of composite beam-to-column joint formed by a composite concrete slab and two lipped CFS C-sections placed back-to-back as beam and column. The second is the experimental investigation of load bearing composite wall frame, while the third is the reinforced concrete beam with CFS section as reinforcement. As the bare CFS sections might not have higher resistance, a composite action with the concrete is utilized and expected to enhance the load carrying capacity and offer significant performance of the joint, the wall and the beam. In the first experiment, two specimens namely the composite joint and non-composite joint are constructed and tested until failure under a point load at a certain eccentricity from the face of the column to induce moment to the joint. The relationship between the load and deflection, and subsequently, the moment and rotation of the joints are obtained, specifically, the ultimate load and the respective moment resistance. As for the load bearing wall, several configurations of CFS frames were cast with concrete and tested under compression. The relationships between the load and lateral deflection were the main results obtained. In the third experiment, two different arrangements of CFS sections have been placed as reinforcement in concrete beam. Tested under bending, the load-deflection relationship was obtained and subsequently the ultimate load. From all of these experimental investigation, it is found out that i) the composite joint yields higher ultimate load and moment resistance compare to the non-composite joint, ii) the wall with vertical studs can carry higher ultimate load, and iii) the CFS sections placed back-to-back yields significant increase in the flexural resistance of the beam. All of these results, collectively, indicate further that the composite construction between CFS sections and concrete could offer potential and significant benefits. In conclusion, based on the efficiency in constructing the light-gauge structure and the potential enhancement of the load-carrying capacity mentioned, the CFS could be another hot item in construction and may not be regarded as cold any longer as the name literally stated.
Dr. Arizu Sulaiman is an Associate Professor of Structural Engineering at the School of Civil Engineering, Faculty of Engineering, Universiti Teknologi Malaysia (UTM). He is specializing in Analysis, Design and Construction of Steel Structures, Hot-Rolled and Cold-Formed Steel, and Steel Connections. He earned a BSc.(Civil Engineering) from University of Missouri-Columbia, USA, and eventually a MEng.(Structural Engineering) and a PhD.(Civil Engineering) from Universiti Teknologi Malaysia.
Currently, he is the Associate Research Fellow of Construction Research Centre (UTM-CRC), UTM; and actively involved in research projects related to the behaviour of steel components and structures.
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