Experimental Investigation on Locally Produced Cold-Formed Steel Sections for Roof Truss System

2012 ◽  
Vol 13 (1) ◽  
pp. 620-623 ◽  
Author(s):  
Shek Poi Ngian ◽  
Mahmood Md Tahir ◽  
Tan Cher Siang ◽  
Ahmad Kueh Beng Hong ◽  
Shahrin Mohammad
Keyword(s):  
Experimental Investigation ◽  
Roof Truss ◽  
Steel Sections ◽  
Cold Formed Steel

scholarly journals Performance of Locally Produced Cold–Formed Steel Sections for Roof Truss System

2012 ◽  
Author(s):  
Mahmood M. T. ◽  
C. M. Thong ◽  
C. S. Tan
Keyword(s):  
Construction Material ◽  
Public Works ◽  
Code Of Practice ◽  
Roof Truss ◽  
Design Values ◽  
Termite Attack ◽  
Steel Sections ◽  
Cold Formed Steel ◽  
Experimental Values ◽  
Steel Section

Secara tradisi, kayu biasanya digunakan untuk kekuda bumbung sebagai bahan binaan. Walaubagaimanapun, kegunaan kayu tidak lagi mendapat sambutan kebelakangan ini disebabkan kos yang tinggi, bukan mesra alam sekitar disebabkan banyak pokok perlu ditebang, terdedah kepada serangan anai–anai dan keupayaan yang rendah dibandingkan dengan keluli. Keratan keluli terguling–sejuk telah dicadangkan di dalam kertas ini bagi pembinaan sistem bumbung kekuda sebagai pilihan lain daripada kekuda kayu. Kertas ini membincangkan keputusan uji kaji bagi cadangan keratan keluli terguling–sejuk yang dikeluarkan oleh pengeluar tempatan sebagaimana yang dinyatakan di dalam kod BS5950 Part 5:1987 bagi kegunaan sistem kekuda bumbung. Ujian–ujian ini juga adalah untuk menepati keperluan–keperluan yang telah digariskan oleh Jabatan Kerja Raya Malaysia. Keputusan–keputusan ujian dari uji kaji menunjukkan keputusan persetujuan yang baik dengan BS 5950 Part 5. Keputusan uji kaji merumuskan bahawa keratan keluli terguling sejuk keluaran tempatan dan sambungannya sesuai digunakan bagi sistem kekuda bumbung. Kata kunci: Keratan keluli terguling-sejuk, sistem kekuda bumbung, keupayaan keratan, keratan C, keratan topi Traditionally, timber is usually used for roof truss as a construction material. However, the use of timber is no longer popular recently due to the increase in cost, not environmental–friendly as more trees need to be cut, prone to termite attack, and lesser capacity compared with steel. Cold–formed steel section has been introduced in this paper for the construction roof truss system as an alternative to the timber truss. This paper describes experimental test results of the proposed cold–formed produced locally with the code of practice as prescribed by BS 5950 Part 5: 1987 for the use in roof truss system. The tests were also performed to meet the requirements that have been outlined by Public Works Department Malaysia. The experimental results showed good agreement with BS 5950 Part 5. From the study it can be concluded that the proposed locally produced cold–formed steel sections and the connections are suitable to be used in the roof truss system provided that the design values should not be more than the experimental values. Key words: Cold-formed steel section, roof truss system, section capacities, C-section, hat-section

scholarly journals Experimental investigation of post-fire mechanical properties of Q235 cold-formed steel

2020 ◽  
Vol 150 ◽  
pp. 106651 ◽  
Author(s):  
Chong Ren ◽  
Liusi Dai ◽  
Yuner Huang ◽  
Wenfu He
Keyword(s):  
Mechanical Properties ◽  
Experimental Investigation ◽  
Cold Formed Steel

Local buckling capacity of C-shaped cold-formed steel sections with punched webs

1984 ◽  
Vol 11 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Robert Loov
Keyword(s):  
Local Buckling ◽  
Effective Width ◽  
Test Results ◽  
Average Yield ◽  
Steel Sections ◽  
Load Tests ◽  
Cold Formed Steel ◽  
Stub Column ◽  
Best Fit ◽  
The Web

Load tests were carried out on 36 stub column samples of cold-formed steel studs having 38.1 mm wide × 44.5 mm long holes punched through their webs, steel thicknesses of 1.21–2.01 mm, and overall section depths of 63–204 mm. Based on these tests a best-fit equation for the effective width of the unstiffened portion of the web beside the holes has been developed. Suggested design equations have been proposed. The test results support the present equation for the average yield stress [Formula: see text] in Canadian Standards Association Standard S136-1974 but the present code equations for unstiffened plates are unduly conservative when applied to the design of the web adjacent to openings of the size considered.

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

2018 ◽  
Vol 15 (5) ◽  
pp. 575-583
Author(s):  
Ka Yee Kok ◽  
Hieng Ho Lau ◽  
Thanh Duoc Phan ◽  
TIina Chui Huon Ting
Keyword(s):  
Genetic Algorithm ◽  
Industrial Application ◽  
Steel Structures ◽  
Single Type ◽  
Efficient Design ◽  
Design Optimisation ◽  
Content Type ◽  
Roof Truss ◽  
Cold Formed Steel ◽  
Multi Level

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 15°. 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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