Based on first-order probability theory, this paper presents a probabilistic procedure for design of timber poles in ground cont; under attack of decay fungi. Fungal attack prediction model developed in a multi-disciplinary national project in Australia, sponsored the Forestry and Wood Products Research and Development Corporation, is used in this study for decay progress modelling, durability design factor, k_D, is derived and proposed for consideration in practical design of timber construction. Examples i computation of k_D for untreated timber poles installed at two sites in Australia are given.
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