Help posts addressing each section of the DMS File
Default DMS File - Modelling based on HDM Concepts
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Fritz Jooste Administrator Posts: 81
3/11/2020
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Fritz JoosteAdministrator Posts: 81
Below is a link for an example DMS file that you can use as a starting point if you want to set up a model for your network. Detailed notes are provided about the model on the "Model Outline" sheet of the DMS.
Click here to download the Default DMS
This DMS is based generally on the HDM concepts where distresses are dependent on each other in the following manner:
- Traffic and Road Class influences crack initiation time
- Cracks start once surface age exceeds crack initiation time
- Crack progression is dependent on Traffic and Surface Age
- Rut progression is dependent on Traffic and Crack Area
- IRI progression is dependent on Traffic and Rut depth
You can change any of the above relationships by refining the default DMS. Given that we have no idea what your network data consists of - this DMS will not work on your data without some refinement from your side. We are happy to help you with advice on how to refine this DMS to suit your specific needs. Feel free to get in touch with Lonrix for assistance.
A few things about this model:
- This model has been set up so that it can be used using simple Ranking, or by using a more sophisticated economic model aimed to maximize Economic Benefit. To switch from one model type to the next, you need to change the "Treatment Assignment Mode" property on the "General" sheet of the DMS. See this help post for details on Treatment Assignment Mode and model types in JunoViewer.
- We have assumed a relatively low scope of information. Specifically, we assume you will not initially know what the structural strength of modelling segments are. Thus the model assigns initially a value of -1 to model parameters that relate to remaining life. Once a structural treatment (asphalt overlay, inlay or rehab) is assigned, the remaining life is updated automatically and from there remaining life calculations are automatically made as the model goes from one year to the next.
- We have given as an example four typical treatments: surface seal, asphalt overlay, asphalt mill-and-overlay, and rehabilitation. We provided example Reset values on all applicable parameters. You need to check and refine these to suit your network situation. To add new treatments, simply copy one of the existing treatments, and then modify the name and other properties accordingly. See this help post for details on how to define treatments.
- We have provided an example of a set of Trigger Rules for each treatment on the "Triggers" sheet of the DMS. You can easily modify these rules to accommodate more or fewer data types in your triggers. Of course, if you add more treatments on the "Treatments" sheet, you will need to create your own triggers for such new treatments.
- For calculation of the Benefit, we have assumed an objective function to express the Road Operating Cost (ROC) purely as a function of road condition, segment length and AADT. An index is first determined based on condition, and this is then multiplied with length and AADT to provide a relative estimate of Road User Costs. The value is finally scaled to match financial units. See the "Econ" sheet of the DMS for details.
- If you are using an Economic Model, the final ROC value is used as an objective function to compare Do-Nothing costs to individual strategies that the model evaluates.
- If you are using a Ranking Model, the final ROC value is used to rank work sections as a means of prioritization if the budget is constrained.
- We have gone to some lengths to develop for you a Deterioration Increment model that is robust and with highly flexible calibration properties. This model makes use of Min-Max Normalization to predict increments that match the observed range of increments on your network. The basis and details of this model are explained in this help post.
edited by admin on 8/6/2020
edited by admin on 10/13/2020
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