Bridge management 3 : inspection, maintenance, assessment, by J.E. Harding, G.E.R Parke, M.J. Ryall, Professor J E

By J.E. Harding, G.E.R Parke, M.J. Ryall, Professor J E Harding, Parke Gerard, M Ryall

This quantity comprises the papers awarded on the 3rd overseas convention on Bridge administration, held on the collage of Surrey, Guildford, united kingdom on 14-17 April 1996.

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Prediction of Bridge Service Life Using Time-Dependent Reliability Analysis 27 depicts the value of the system state Zn at each time point, n. In the Markov-chain bridge deterioration model, the system states are indicated by some ratings of bridge condition. Existing bridge deterioration models based on the Markov chain theory invariably assumes that a bridge can either remain in the current state or deteriorate to the next state in one transition. Also, the worst state M in a state space of {1, 2, …, M} is considered an absorbing state; which means that once the process enters the state it will never leave it.

1 Concept In case-based reasoning, a case database is first built up by accumulating collected cases systematically on the basis of their characteristics. Then, this database is retrieved for cases (including failure cases) in the past similar to a given subject, and the problems are solved by modifying the solutions. Case-based reasoning stands between “rule-based reasoning” where reasoning is conducted based on only rules and “model-based reasoning” where, a large-scale case database being used, reasoning is conducted based on only matching.

By refining the structural analysis methods to take into account the plastic capacity of the concrete deck, however, it was verified that the positive moment capacity is sufficient and hence only the punching shear strength remained a problem. By sensitivity analysis the governing parameter for the punching shear strength with the particular geometry and reinforcement at hand was identified as the concrete compression strength and therefore emphasis was focused on this. The concrete compression strength assumed in the original project material was given as a cube compression strength of 20 MPa.

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