Comparison of Predictive Pavement Management Models (HDM-III, HDM-4, NZ DTIMS) for New Zealand Conditions PDF Download
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Author: Nabin Pradhan
Publisher:
ISBN: 9780478250855
Category : Pavements
Languages : en
Pages : 150
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Book Description
Author: Nabin Pradhan
Publisher:
ISBN: 9780478250855
Category : Pavements
Languages : en
Pages : 150
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Book Description
Author:
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 108
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Author: Theuns F. P. Henning
Publisher:
ISBN: 9780478287158
Category : Pavements
Languages : en
Pages : 123
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Author: Louw Kannemeyer
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
The growing interest in pavement management systems (PMSs), both in South Mrica and internationally, has been in response to a shift in importance from the construction of new roads to the maintenance of the existing paved network coupled with increasingly restrictive road funding. In order to develop a balanced expenditure programme for the national roads of South Africa there is a need to predict the rate of deterioration of a pavement and the nature of the changes in its condition so that the timing, type and cost of maintenance needs could be estimated. Internationally these expected changes in pavement condition are predicted by pavement deterioration models, which normally are algorithms developed mathematically or from a study of pavement deterioration. Since no usable pavement deterioration models existed locally, it was necessary to evaluate overseas literature on pavement deterioration prediction models with the aim of identifying models possibly applicable to the national roads of South Africa. Only deterioration models developed from the deterioration results of inservice pavements under a normal traffic spectrum were evaluated. Models developed from accelerated testing were avoided since these models virtually eliminated long?term effects (these are primarily environmental but also include effects of the rest periods between loads), and that the unrepresentative traffic loading regimes can distort the behaviour of the pavement materials, which is often stress dependent. Models developed from the following studies were evaluated: AASHO Road Test The Kenya study Brazil-UNDP study (HDM-ill models) Texas study Of all the above models studied that were developed from major studies it was concluded that the incremental models developed during the Brazil study, were the most appropriate for further evaluation under South African conditions. A sensitivity analysis was conducted on the HDM-III models to evaluate their sensitivity to changes in the different parameters comprising each model. The results obtained from the sensitivity analysis indicate that the incremental roughness prediction model incorporated into the HDM-III model tends to be insensitive to changes in most parameters. Accuracy ranges for input data were, however, also identified for parameters which indicated an increase in sensitivity in certain ranges. The local applicability of the HDM-III deterioration models were finally evaluated by comparing HDM-III model predictions with the actually observed deterioration values of a selected number of national road pavement sections. To enable the above comparison, a validation procedure had to be developed according to which the format of existing data could be transformed to that required by the HDM-ill model, as well as additional information be calculated. From the comparison it was concluded that the HDM-III models are capable of accurately predicting the observed deterioration on South African national roads, but that for most models calibration is needed for local conditions. Guidelines regarding recommended calibration factor ranges for the different HDM-ill models are given. Finally it is recommended that the HDM-III models should be considered for incorporation into a balanced expenditure programme for the national roads of South Africa.
Author: Theunis F. P. Henning
Publisher:
ISBN:
Category : Highway engineering
Languages : en
Pages :
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Author:
Publisher:
ISBN:
Category : Economic impact analysis
Languages : en
Pages : 40
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Book Description
This primer provides a foundation for understanding the role of economic analysis in highway decision making. It is oriented toward state and local officials who have responsibility for assuring that limited resources get targeted to their best uses and who must publicly account for their decisions. Economic analysis is presented as an integral component of a comprehensive infrastructure management methodology that takes a long-term view of infrastructure performance and cost. The primer encompasses a full range of economic issues, including economic fundamentals, life-cycle cost analysis, benefit-cost analysis, forecasting traffic for benefit calculations, risk analysis and economic impact analysis.
Author: National Research Council (U.S.). Transportation Research Board
Publisher:
ISBN: 9780309029667
Category : Roads
Languages : en
Pages : 42
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Author: T.F. Fwa
Publisher: CRC Press
ISBN: 1420039504
Category : Technology & Engineering
Languages : en
Pages : 886
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Book Description
Modern highway engineering reflects an integrated view of a road system's entire lifecycle, including any potential environmental impacts, and seeks to develop a sustainable infrastructure through careful planning and active management. This trend is not limited to developed nations, but is recognized across the globe. Edited by renowned authority
Author: James O. Brewer
Publisher: DIANE Publishing
ISBN: 1428952330
Category : Roads
Languages : en
Pages : 63
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Author:
Publisher:
ISBN:
Category : Transport workers
Languages : en
Pages : 56
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