STRENGTH MODELLING OF AXIALLY LOADED DOKA (Isoberlinia doka) TIMBER COLUMN

Publication Date : 01/08/2009


Author(s) :

A. A. Jimoh.


Volume/Issue :
Volume 4
,
Issue 2
(08 - 2009)



Abstract :

The paper presents a design procedure for axially loaded doka timber (botanical name - Isoberlinia doka), as a column or strut. Instead of the usual categorization of columns or struts into short, intermediate and slender according to the value of slenderness ratio, a continuous column formula to cover the three categories is derived. To derive the model, an experimental program was carried out on direct axial compressive strength test on doka specimens, to obtain stress and strain data. The data were subsequently analyzed to derive the typical stress-strain equations in compression. This equation and the Euler – Engesser stress formula were used to obtain values of critical stress and corresponding slenderness ratios, which was subsequently analysed to form the proposed design equation. The equation was verified on doka columns of different slenderness ratio and which conservatively predicted the experimental ultimate load capacity of the columns


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