Content validity of construction quality management of industrialised building system (IBS) related project in Malaysia

Zawawi, Mohd Hafiz; Azman, Nor Syahirah; Ramli, Mohd Zakwan; Roslin, Nursyadzatul Tasnim

doi:10.1063/5.0027056

Cited by 1 publication

(1 citation statement)

References 2 publications

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“…With its high strength to weight (S/W) ratio, cost-effectiveness and consistent mass production, CFS has become a viable roof construction material, as an alternative to traditional timber roof construction, especially in Malaysia. CFS has become popular because of the mandatory policy in 2008 by the Malaysian Government, which requires at least 70 per cent of the construction material in public sector projects consists of pre-fabricated components (Zawawi, 2009), such as CFS. With these, the local truss manufacturers have been innovative in their roof truss designs by capturing the advantages of CFS.…”

Section: Introductionmentioning

confidence: 99%

Design optimisation for cold-formed steel residential roof truss using genetic algorithm

Kok

Lau

Phan

et al. 2018

WJE

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Purpose This paper aims to present the design optimisation using genetic algorithm (GA) to achieve the highest strength to weight (S/W) ratio, for cold-formed steel residential roof truss. Design/methodology/approach The GA developed in this research simultaneously optimises roof pitch, truss configurations, joint coordinates and applied loading of typical dual-pitched symmetrical residential roof truss. The residential roof truss was considered with incremental uniform distributed loading, in both gravitational and uplift directions. The structural analyses of trusses were executed in this GA using finite element toolbox. The ultimate strength and serviceability of trusses were checked through the design formulation implemented in GA, according to the Australian standard, AS/NZS 4600 Cold-formed Steel Structures. Findings An optimum double-Fink roof truss which possess highest S/W ratio using GA was determined, with optimum roof pitch of 15Â°. The optimised roof truss is suitable for industrial application with its higher S/W ratio and cost-effectiveness. The combined methodology of multi-level optimisation and simultaneous optimisation developed in this research could determine optimum roof truss with consistent S/W ratio, although with huge GA search space. Research limitations/implications The sizing of roof truss member is not optimised in this paper. Only single type of cold-formed steel section is used throughout the whole optimisation. The design of truss connection is not considered in this paper. The corresponding connection costs are not included in the proposed optimisation. Practical implications The optimum roof truss presented in this paper is suitable for industrial application with higher S/W ratio and lower cost, in either gravitational or uplift loading configurations. Originality/value This research demonstrates the approaches in combining multi-level optimisation and simultaneous optimisation to handle large number of variables and hence executed an efficient design optimisation. The GA designed in this research determines the optimum residential roof truss with highest S/W ratio, instead of lightest truss weight in previous studies.

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Section: Introductionmentioning

confidence: 99%