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Journal of Emerging Trends in Engineering and Applied Sciences (JETEAS)


Article Title: Effect of Shape Configuration on the Deflection of Timber Trusses
by Ezeagu C.A and Offor N.I

In this study, a non-destructive experimental test was carried out on twelve members of four monochord truss configurations-Howe truss, Hip Step Down, Parallel chord and Dual pitched Trusses. Each truss configuration was made into three trusses to ensure relatively accurate results. All the trusses were built with soft wood (obeche-Triplochiton schlexylon) of 1 inch by 1 inch (25 mm by 25 mm) cross - sectional dimension. The length of the bottom chord was 1,600mm (1.6m). The rise was 200mm (0.2m). The objective of the test was to obtain the deflections of the aforementioned truss configurations when subjected to known values. These loads were increased uniformly and the consequential values of deflections for the different truss shapes were noted. The deflection values were taken at the nodes along the bottom chord of the trusses with the maximum deflection occurring at the mid-span except for the Dual pitch trusses whose maximum deflection occurs at a node next to mid-span node. The following average maximum deflections were recorded from the various shape configurations of truss models during the experiment. Howe truss configurations gave average maximum deflections of 3.5 mm, 3.5 mm, 7.5 mm, 10.2 mm and 12.3mm under the load values of 5kg at 200mm centers, 10kg at 400mm centers, 10kg at 200mm centers, 20kg at 400mm centers and 50kg respectively at the mid-span. Hip step down gave average maximum deflections of 4.5mm, 4.0mm, 8.3mm, 13.3mm and 14.8mm respectively under the same load values. The parallel chord trusses gave average deflections of 9.5mm, 10.2mm, 25.0mm, 30.7mm and 33.7mm respectively under the same load values. The Dual Pitch trusses gave average maximum deflection of 8.0mm, 7.1mm, 13.3mm, 16.4mm and 18.2mm respectively under the same range of loads.
Keywords: configuration, deflections, shape, timber, trusses
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ISSN: 2141-7016

Editor in Chief.

Prof. Gui Yun Tian
Professor of Sensor Technologies
School of Electrical, Electronic and Computer Engineering
University of Newcastle
United Kingdom



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