The Target Reliability And Design Working Life
Author(s)
M. Holický
Abstract
Design working life and target reliability levels recommended in various national
and international documents are inconsistent. Indicative values of design
working life are within a range from 10 to 100 years for different types of
structures, recommended target reliability indexes are usually given for one or
two reference periods (1 year and 50 years), without an explicit link to the design
working life. The contribution attempts to clarify the relationship between the
design working life and the reliability index and to provide guidance for
specification of the target reliability level for given consequences, designs
working life and discount rate. The theoretical study based on probabilistic
optimization is supplemented by practical recommendations. It appears that the
optimum reliability indexes depend primarily on the ratio of cost of structural
failure (malfunctioning costs) and the cost per unit of structural parameter, less
significantly on the design working life and discount rate.
Keywords: design working life, target reliability, optimisation.
1 Introduction
Design working life is understood as an assumed period of time for which a
structure is to be used for its intended purpose without any major repair being
necessary. Indicative values of design working life (10 to 100 years for different
types of structures) are given in EN 1990 [1]. Recommended target reliability
indexes are given for two reference periods (1 year and 50 years), without any
explicit link to the design working life (see Table 1).
It should be underlined that a couple of values (for 1 year and 50 years)
given in Table 1 for each reliability class corresponds to the same reliability
level. Practical application of these values, however, depends on the time period
considered in the verification, which may be linked to available probabilistic
Keywords
design working life, target reliability, optimisation
Related Book
Other papers in this volume
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