Reliability-Based Analysis and Calibration of Eurocode 5 Design Criteria for a Solid Timber Portal Frame
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Description
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Abstract
In this study, laboratory tests were conducted on some commonly used timber species (Alstonia boonei, Triplochiton Scleroxylon, Terminalia Ivorensis, Terminalia superba and Lophira Alata) in Nigeria.
The tests were in accordance with, EN 408, EN 13153-1 and ASTM D-143). The test results were analysed in accordance with Eurocode 5. Eurocode 0, JCSS and EN 384, with the aid of Easyfit statistical package.
The statistics of the reference properties (density, modulus of elasticity and bending strength) of each specie were generated, and EN 338 strength class assigned to each species after adjustment to 18% Nigerian reference moisture content.
The mean values of the densities are: 360.76kg/m3, 380.25kg/m3, 472.10kg/m3, 533.89kg/m3, 955.93kg/m3, for the Alstonia boonei, Triplochiton Scleroxylon, Terminalia Ivorensis, Terminalia superba and Lophira Alata respectively. The corresponding coefficients of variation are 4%, 16%, 18%, 19% and 4%.
Likewise, the mean values of moduli of elasticity are 8192.0N/mm2, 6137.80N/mm2, 12161.0N/mm2, 11614.0N/mm2 and 22750.0N/mm2, for Alstonia boonei, Triplochiton Scleroxylon, Terminalia Ivorensis, Terminalia superba and Lophira Alata, with the corresponding coefficients of variation of 6%, 27%, 22%, 21% and 12% respectively.
Introduction
Many nations have either developed or are in the process of developing their own codes of practice, based on the most recent available database. Every country need to develop its design codes because of diversity in geographical and environmental conditions.
In most of the Common Wealth countries, including Nigeria (Auta and Mastenikov, 2006; SNiP, 2004; Onundi, et al, 2009), the design or investigation of physical structures and facilities are in accordance with the requirements of the British Standard code of practice.
The former British design code for timber structures, BS 5268, is based on the permissible stress method. The code was withdrawn in April, 2010 and replaced with the Eurocode 5. The Eurocode 5 is based on the limit state concept. Consequently, since that date, BS 5268 was not maintained.
The withdrawal of BS 5268 and the adoption of the Eurocode 5 has wide ramification to Nigeria, and other commonwealth countries.
In Nigeria, the code of practice for the design of timber structures was largely based on the withdrawn permissible stress design code. It implied that the NCP 2 is now left without a basis.
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