Life-cycle Management of Bridges: What is the Best Approach?
- Publication no: ABC-LCM201-14
- Published: 22 October 2014
A key element of optimised asset management involves determining the type and timing of maintenance and renewals actions to achieve the least whole-of-life cost. This can often be a very complex process in reality because of the many different factors involved and the uncertainty of future performance. Typical formal asset management theory requires the condition rating of elements to an agreed system, typically with a grading of 1 to 5. These condition ratings are then inputs to predictive models that forecast future maintenance and renewal requirements together with their timing and costs for asset management planning purposes. The rating numbers can also provide a quantitative measure of condition, and condition trends over time.Bridge condition rating systems have been developed and implemented throughout the world, including NZ and all Australian states, but to date the associated predictive models have not been successfully developed, based on available information.This paper reviews the condition rating/predictive modelling approach and an alternative engineering approach. A specific NZ example of the engineering approach is also provided.