Our solution provided the basis for a maintenance strategy which maintained the required safety level, whilst maximising performance with respect to economic cost.

Alan O'Connor

Client
Irish Rail
Completed
2010
Location
Dublin
Market

Summary

Roughan & O’Donovan Innovative Solutions (ROD-IS) carried out a probabilistic assessment of the Malahide railway viaduct following the scour induced failure of one of its supporting piers in 2009.

Solution

We calculated the level of safety in terms of the reliability index (β-index) of the structure, when compared to the minimum value required by the Eurocode.

Our assessment was informed by an extensive suite of both non-destructive and destructive testing including:

  • Full scale load testing of individual beams
  • Sampling and laboratory testing of material properties
  • Electro-chemical techniques to assess the condition of the structure

Challenge

In undertaking the probabilistic modelling, we used both stochastic and deterministic variables to consider the load and resistance of the structure.

We modelled the following parameters:

  • Deterioration (tendon corrosion as the main factor)
  • Damage mechanisms
  • Loading, material and prestress uncertainties

Services provided:

  • Risk-based asset management
  • Structural health monitoring
  • Traffic load modelling