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Unified Journal of Engineering and Manufacturing Technology

March 2018 Vol 2(1), pp. 001-018

Copyright 2018 Unified Journals

Original Research Article

Construction and Theoretical Analyses of a Roof Truss Made of Gmelina (Gmelina Arborea) Suitable for Cross River State of Nigeria

Agbonkhese, Kingsley A.1*, Isemede, Eric E.2, Omoikholo, Frank.3, Eme, Sunday C.4

1, 3,4Department of Mechanical Engineering Technology, National Institute of Construction Technology (NICT), Uromi, Edo State, Nigeria

2Department of Civil Engineering Technology, National Institute of Construction Technology (NICT), Uromi, Edo State, Nigeria

Corresponding Author's Email: kinger4real@yahoo.com

Accepted 26th February, 2018


Abstract


The research was done to determine the ability of roof truss made of Gmelina arborea to withstand deflection when subjected to design loads. The design load was resolved to act on the joint of the truss. The truss was then manually analyzed using the method of joints to determine the compressive and tensile axial forces on the truss members. The type of truss analyzed for, was pitched roof trusses with emphasis on Howe Truss. The span of the roof truss was 6000mm while the spacing of truss members was 1500mm. Gusset plates of 12mm plywood, bolts and nuts were used as fasteners. The cross sectional dimensions of the roof truss members is 1500mm. The truss members were analyzed as simply supported beam.
The mid span deflection on the members were analyzed using the method of joints. The result shows that the maximum possible deflection of 13.83mm was obtained and within the limit of permissible deflection of 18mm (L/333) as stipulated in NCP 2 (the use of timber for construction 1976 code of practice) for permissible stress design and this is in agreement with the analysis carried out. This result of our analysis helps to recommend the use of Gmelina arborea for the construction of roof trusses.

Keywords: Gmelina arborea, deflection, Roof truss, Life load and dead load

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Cite This Article

Agbonkhese, Kingsley .A et al., Construction and Theoretical Analyses of a Roof Truss Made of Gmelina (Gmelina Arborea) Suitable for Cross River State of Nigeria. Unified Journal of Engineering and Manufacturing Technology. 2(1) 2018 pp. 001-018.




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