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APPENDIX G User Guide Software Help Screens
Pages 235-252

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From page 235...
... Select Units Dialon Lenal Weight Limits Dialog Data File Format Dialon Enforcement Condition Dialon Number of Data Files Dialoq Select Data File Dialon Pavement Analysis Dialoq Percentane of Overweight Trucks Dialog Truck Classification Data Dialon Breakdown of Violations Dialogs Severity of Violations Dialoq 1 Appendix G
From page 236...
... Please select one of the following topics: Select Units Dialon Legal Weight Limits Dialog Data File Format Dialog Enforcement Condition Dialog Ap,6dnd~x G 2
From page 237...
... Percentage of Overweight Trucks Dialog Truck Classification Data Dialog Breakdown of Violations Dialogs Severity of Violations Dialog ESAL Data Dialoq Data File Conversion Dialon comparison of Enforcement Condition Dialog Sampling Guide Dialon Pavement Effects Analysis Dialon Select Units Dialog This dialog asks you to select the system of units of measure to be used by the program. The choices are the English (feet, pounds)
From page 238...
... Legal Weight Limits Dialog The Set Legal Weight Limits dialog asks you to enter the maximum allowable weights as defined by your local laws. There are three fields presented: Gross Weight, Single Axle Weight and Tandem Axle Weight.
From page 239...
... 6 = 2.6. DETERMINATION OF ESTIMATED PAVEMENT LIFE Flexible Pavements MSHTO Design Equation The AASHTO Design equation for flexible pavements is: logy = ZR*
From page 240...
... thickness relationship as a part of the study to assess the effects of weight enforcement on pavement performance. To examine the effects of various cumulative ESALs on pavement life it is convenient to assume a known existing pavement of say SN = 5.
From page 241...
... Therefore, a typical DPSI is about 1.7. Now, it is possible to solve Equation D4 for local conditions and, and making the appropriate substitutions in Equation D3, go through the analysis of before and after enforcement traffic streams to assess the impact of that enforcement on pavement life.
From page 242...
... Pavement materials personnel who run this software have the option of overriding default values, depending upon their own knowledge of pavement materials and design procedures along with specific pavement characteristics associated with the enforcement location. The structural number (SN)
From page 243...
... Use of the conversion utility is fairly simple. For an overview of using the utility, click on Usinn the Conversion Utilitv For information on custom file formats, and how to enter them into the utility, click on Usinn Custom File Formats Using the Conversion Utility The TWEET Data File Conversion Utility main window provides a fast, efficient way to convert data files from other formats to the 1995 FHWA Truck Weight Record format.
From page 244...
... Using Custom File Formals Pressing the Edit button in the main window or selecting custom from the Input Format field dropdown list box will bring up the utility's custom data file format entry dialog. Here is an overview of the options in this dialog: Field Selection list box - The large list box at the left of the dialog allows for the selection of a particular field in the custom file format.
From page 245...
... Percentage of trucks violating the Bridge Formula This is the percentage of all trucks in the sample which violated the Bridge Gross Weight Formula. The presence of a violation is determined by using an equation, the Bridge Formula, which relates the axle spacing and axle weights.
From page 246...
... common on the road, etc. The dialog consists of two parts: Truck Classification List Box This list box lists all of the truck classifications which were input by the user during the beginning of the analysis, or if the default was selected, the FHWA 13-type classifications.
From page 247...
... Displayed information consists of the calculated pavement ESAL capacity, the estimated pavement life under both observed enforcement conditions, and estimated percentage pavement-life change due to the observed ESAL-loading difference assm ciated with the enforcement activity. For information regarding computation of design pavement life, see Me Pavement Analysis Dialon.
From page 248...
... See Select Units Dialon for more information. Next, you will be asked to enter the weight limits you wish the program to use, via the Set Legal Weight Limits dialog box.
From page 249...
... Initial Serviceability Index pi Terminal Serviceability Index MR Default function of Serviceability Index ZR SO Standard Normal Deviate corresponding to design reliability Standard Deviation associated with pavement performance prediction . Because the pavement's Structural Number (SN)
From page 250...
... Press UNext " button when you are ready to view the next calculation result. You can press Help for more information about each dialog and its information, or click on one of the following links: Percentage of Overweight Trucks Dialon Truck Classification Data Dialoq Breakdown of Violations Dialogs Severity of Violations Dialon ESAL Data Dialoq Data File Conversion Dialon comparison of Enforcement Condition Dialon Sampling Guide Dialon Pavement Effects AnalYsis Dialon The first M.O.E.
From page 251...
... Displayed information consists of the calculated pavement ESAL capacity, the estimated pavement life under both observed enforcement conditions, and estimated percentage pavement-life change due to the observed ESAL-loading difference associated with the enforcement activity. Printing Out Results Each out dialog box incorporates a Print button for the purpose of printing results shown.


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