Browsing by Author "Rahmon, R.O"
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Item Compressive Strength Characteristics of Ara and Apado Nigerian Timber Species . Ethiopian Journal of Science and Sustainable Development. 6(2); 1-7, Published by Adama Science & Technology University, Ethiopia.(Ethiopian Journal of Science and Sustainable Development. Adama Science & Technology University, Ethiopia., 2019) Jimoh, A.A.; Rahmon, R.OThe paper examined the reliability of the Nigerian grown Ara and Apadotimber species as column materials. The work focuseson the compressive strength characteristics of Nigerian Ara (Pterocarpus erinaceus) and Apado (Berlinia spp)timber column of nominal lengths 200, 400, 600 and 800 mm and cross section of 50 by 50 mm. The steps involved include collection and conditioning of Apa and Apado timber species, preparation of test specimens, determination of physical and compressive strength properties and derivation of continuous column design equations. Twenty (20) test samples were used for all the tests carried out. Apa and Apado have an average density of 652.83and 732.56 kg/m3,respectively. Moisture content of both speciesisless than the maximum recommended value of 20 % and the average strength at yield of Apa and Apado were 38.81and 29.61 N/mm2. The derived continuous equations for design of Apa and Apado column are σ=47.882−0.009λand σ=17.211−0.007λrespectively. Ara and Apado have the reliability index of 0.63 and 0.65 respectively for a service life of 50years, assuming other serviceability conditions are met.The paper therefore recommends the adoption of these equations for the design of compression members from these timber species, in NigeriaItem Evaluation of Buckling Characteristics of Structural-Size Pycnanthus angolensis and Vitex doniana as Timber Column Under Compression(University Politehnica Timisoara, Faculty of Engineering Hunedoara, Romania . Available at: http://acta.fih.upt.ro/pdf/2019-4/ACTA-2019-4-20.pdf, 2019) Jimoh, A.A.; Rahmon, R.OStructural reliability was examined on the lesser-used timber species such as Akomu (Pycnanthus angolensis) and Eriri (Vitex doniana) which can be good substitute to the well-known species. The strength and physical properties of these timber species were determined to predict their suitability as structural material. Forty lengths of timber species of 50 x 50 mm cross-section were purchased from timber markets in Ilorin, Kwara State, Nigeria. The prevailing environmental conditions during the test were 31 oC and 64 % relative humidity. The properties tested were air dry density, moisture content and compressive strength parallel to grain of forty test specimens each of lengths, 200, 400, 600 and 800 mm in accordance with the British Standard BS 373 (1957). Mean air-dried moisture content for Akomu and Eriri were 11.12 and 13.29 %, respectively. Mean density of Akomu and Eriri were 644.58 and 889.84 kg/m3, respectively. The typical derived equations to relate the stress and strain for Akomu and Eriri were y= 1097.8x − 2.9858 and y = 1033.7x − 2.5309, respectively. Results of reliability analysis show that Akomu and Eriri timber have reliability index of 0.68 and 0.63, respectively for a service life of 50 years, provided other serviceability conditions are met.Item INVESTIGATION OF COMPRESSIVE STRENGTH CHARACTERISTICS OF STRUCTURAL-SIZED ARERE (Triplochiton scleroxylon) AND EMI (Vitellaria paradoxa ) TIMBER COLUMNS GROWN IN NIGERIA(Adama Science & Technology University, Ethiopia. Available online at: https://ejssd.astu.edu.et/index.php/EJSSD/article/view/96/35, 2019) Jimoh, A.A.; Rahmon, R.OStructural reliability was examined on the lesser-used species such as Arere (Triplochiton scleroxylon) and Emi (Vitellaria paradoxa) which can be good substitute to the well-known species. The strength and physical properties of these timber species were determined to predict the suitability of the species as structural material. Twenty lengths of timber species of 50 x 50 mm cross-section were purchased from timber market in Ilorin, Nigeria. The prevailing environmental conditions during the test were 31oC and 64% relative humidity. The properties tested included; air dry density, moisture content and compressive strength parallel to grain of twenty (20) test specimens each of lengths, 200, 400, 600 and 800 mm done in accordance with the British Standard BS 373 (1957). Mean air-dried moisture content for Arere and Emi were 14.48 and 15.89 % respectively. Mean density of Arere and Emi were 514.32 and 1147.75 kg/m3 respectively. The reliability index of Arere and Emi timber species are 0.64 and 0.65 respectively for a service life of 50 years, assuming all other design conditions are met.