Report : stochastic analysis of road asset data for maintenance cost prediction
Authors
Publication date
1 September 2005
Publisher
CRC for Construction Innovation
Abstract
Reliable budget/cost estimates for road maintenance and rehabilitation are subjected
to uncertainties and variability in road asset condition and characteristics of road
users. The CRC CI research project 2003-029-C ‘Maintenance Cost Prediction for
Road’ developed a method for assessing variation and reliability in budget/cost
estimates for road maintenance and rehabilitation. The method is based on
probability-based reliable theory and statistical method. The next stage of the current
project is to apply the developed method to predict maintenance/rehabilitation
budgets/costs of large networks for strategic investment. The first task is to assess
the variability of road data. This report presents initial results of the analysis in
assessing the variability of road data. A case study of the analysis for dry non
reactive soil is presented to demonstrate the concept in analysing the variability of
road data for large road networks. In assessing the variability of road data, large road
networks were categorised into categories with common characteristics according to
soil and climatic conditions, pavement conditions, pavement types, surface types and
annual average daily traffic. The probability distributions, statistical means, and
standard deviation values of asset conditions and annual average daily traffic for
each type were quantified. The probability distributions and the statistical information
obtained in this analysis will be used to asset the variation and reliability in
budget/cost estimates in later stage.
Generally, we usually used mean values of asset data of each category as input
values for investment analysis. The variability of asset data in each category is not
taken into account. This analysis method demonstrated that it can be used for
practical application taking into account the variability of road data in analysing large
road networks for maintenance/rehabilitation investment analysis
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