Renewal decisions from a Life-cycle Cost (LCC) Perspective in Railway Infrastructure: An integrative approach using separate LCC models for rail and ballast components

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George Rangel
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Renewal decisions from a Life-cycle Cost (LCC) Perspective in Railway Infrastructure: An integrative approach using separate LCC models for rail and ballast components

Mensagem por George Rangel » 18 Nov 2014, 11:49

Autor: António Ramos Andrade (Andrade, A. R.)

Orientador: Paulo Manuel da Fonseca Teixeira (Teixeira, P. M. F.)

Instituição: Universidade Técnica de Lisboa
Departamento: Instituto Superior Técnico
Cidade: Lisboa
Ano: Setembro/2008
Andrade - 2008.pdf
Abstract:
The aim of the present research is to develop an integrative approach to support renewal decisions of Railway infrastructure components, namely ballast and the rail. Having in mind that the Railway infrastructure sector has faced drastic transformations due to liberalization of the sector, more conscious and transparent decision-making processes are needed, where Life-cycle Cost (LCC) analysis may be crucial to overcome new challenges. In the present work, rail and ballast LCC models are developed separately. For the rail LCC model, an existing model is used, whereas for the ballast LCC model, a new model is proposed based on a track geometry degradation model. Regarding the assessment of the uncertainty associated with LCC estimations, an innovative approach is put forward, where a step back is taken to the typical approaches, inserting uncertainty earlier in degradation model parameters, rather than RAM (Reliability, Availability and Maintainability) parameters. Nevertheless, in LCC ballast model, potential uncertainty related to unavailability costs proves to be more relevant on renewal decisions, rather than uncertainty related with tamping costs assessed by Monte Carlo simulation. A straight-forward approach that integrates both LCC models based on the construction of hypothetical scenarios where distinct renewal tonnages are used to achieve an optimal renewal strategy is developed.
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