By J.E. Harding, G.E.R Parke, M.J. Ryall, Professor J E Harding, Parke Gerard, M Ryall
This quantity includes the papers awarded on the 3rd overseas convention on Bridge administration, held on the college of Surrey, Guildford, united kingdom on 14-17 April 1996.
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Extra resources for Bridge management 3 : inspection, maintenance, assessment, and repair
26–30. (in Japanese). W. (1984), Fatigue and Fracture in Steel Bridges-Case Study-, John Wiley and Sons, Inc. MOSES Civil and Environmental Engineering Department, University of Pittsburgh, Pittsburgh, Pennsylvania, USA Abstract A bridge deterioration model is an essential component of a computerised bridge management system (BMS). Existing BMSs use Markov chain theory to model the deterioration process as a decay of condition ratings over time. An alternative approach, based on timedependent reliability theory, is proposed.
In the case of steel bridges maintenance and administration are becoming more and more important. At present, the selection of repair and retrofit methods for the fatigue damage of steel bridges is dependent on the highly developed expertise of experts and empirical knowledge from many years. In fields like this, knowledge-based expert systems can be effective tools. Accordingly, the authors have been building a knowledge-based expert system to select repair and retrofit methods for fatigue damage of steel road bridges .
Failure’, in this context, refers to the event that the state hits a well-defined threshold value for the first time. The reliability function explicitly expresses the reliability of a new bridge at any point in time. For an in-service bridge we would use an equivalent function known as hazard function, h(t). The hazard function specifies the instantaneous rate of failure at time t, given that the individual survives up till time t. It can be proven that: h(t)=f(t)/S(t) (6) where f(t) is the probability density function of T.