SUMMARY of UPDATES to HLR4
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V5.0.8  2 August 2012

(1) Background colour to graphics windows changed
 
    The background colour to the graphics windows in the 
    Data Entry, Analysis and Results interrogation forms was 
    changed from white to light grey (WIN 7 was substituting
    black for the white background, making it impossible to 
    view information that was itself black (font, lines etc)

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V5.0.7  25 Jan 2012

(1) Restricted Bridges Report

    Simply supported structures with a single capacity set
    for which a shear check was required showed a larger 
    capacity value in the second column of the Girder 
    Capacities section of the report than that in the 
    first column (they should be equal).

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V5.0.6  1 Dec 2010

(1) Minute Report

    Structures were being omitted from the Minute under some
    circumstances viz:  in situations where a structure was 
    checked for a number of force vectors (such as moment and 
    shear) and subsequently flagged with multiple restrict-
    ions for the moment check but not the shear check and the
    first check was for shear.  The program was apparently 
    picking up the shear check as OK but neglecting the 
    subsequent restrictions generated by the moment check. As
    a result the structure was not included in the Minute.

(2) Structure Data Entry  Continuous Span Data

    The system would crash if the cursor was in a cell on 
    the last row of the properties table and any one of the 
    two replication buttons was inadvertently clicked.

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V5.0.5  9 Aug 2010

(1) Code & Files Cleaned

    Unused code, forms and files were deleted from the 
    program.   Changes have been documented in the header 
    block of the main form (frmMain).

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V5.0.4  25 June 2010

(1) Vehicle width modified axle loads

    VicRoads has been using a PC based program (PCLegal) to 
    compare heavy load vehicles to design load vehicles.  
    The program has the option to reduce heavy vehicle axle 
    loads according to axle width (Wa) and the type of 
    structure being loaded (i.e. timber or concrete).  The 
    default is full axle load.  These axle load reduction 
    factors vary from the DTEI method which is based on the 
    simple expression: 3/Wa (only applied if Wa>3).  It has 
    been found that this axle load reduction method is more 
    conservative that that used by VicRoads (by about 20%).  
    
    As a consequence, VicRoads was finding that, when using 
    HLR, more structures were being assessed as being over
    loaded as against manual calculation methods incorpor-
    ating PCLegal and inventory data.The modification 
    implemented in this version of HLR will allow the client
    to (optionally) select either the current HLR axle 
    reduction factor (3/Wa) or the following VicRoads axle 
    load reduction method (equivalent to the PCLegal 
    Concrete distribution).   

    If we let:
      WMF = Width Modified Factor
      Wa = Axle width of heavy load vehicle
      W1 = Transition axle width, where the Width Modified 
           Factor changes from a constant to a variable 
           value
      C1 = Value of constant Width Modified Factor for axle 
           widths up to W1 
      C2 = Value of constant numerator to calculate variable 
           Width Modified Factor for axle widths greater 
           than W1
    Then:
           If  Wa <= W1,  WMF = C1   . (1)
           If  Wa > W1,  WMF = C2/Wa    (2)
    For example,      
           Vicroads could use:   C1 = 1.2, C2 = 2.4, W1 = 2
           DTEI would use:       C1 = 1.0, C2 = 3.0, W1 = 3 
    Note that the Width Modified Axle Load Factor is a load 
    distribution technique and is not to be confused with 
    the legal ability to increase actual axle loads on 
    specific Heavy Load Vehicles when using Axle Mass Axle 
    Spacing regulations.


(2) Vehicle tab:

    Two changes have been made to the Vehicles tab on the 
    Application Data Entry form:

      - The method used to modify axle loads is now display
        ed on the tab and the Reduced Load column has been 
        renamed to Modified Load (ditto with the tick box 
        label on the Analysis Options tab).

      - When a vehicle is loaded from the database the 
        program will apply the current axle load modifica-
        tion factors to the axle loads and display them in
        the table.  If C1 = 1 then only equation (2) is 
        shown.  If C1<>1 then both equations will be 
        displayed.


(3) Options form / Default Settings tab

    A new Width Modified Factors frame has been added to 
    the tab.  It allows default values for the parameters 
    C1, C2 and W1 to be specified and saved to the defaults 
    file.  These factors will be automatically loaded and 
    used whenever HLR is run.  (Note:  The factors can be 
    changed while HLR is running.  However, after you have
    changed these factors in the Options form you will need 
    to refresh the display of the new Modified Loads in
    the Vehicle tab.  To do this just click on any other
    tab on the Data Entry form then return to the Vehicle
    tab.

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V5.0.3  25 May 2010

(1) Restricted Bridges / All Bridges Reports

    Structures that were not found in the HLR database were 
    not being shown in both of these reports.  Fixed.

(2) Selection of PBS Networks

    An option has been provided on the Analysis of Selected
    Structures form to select one of the standard PBS Net-
    works.  This is done via a drop-down list box that shows
    the available networks.  Highlight the network required
    then click the button labelled Load selected PBS net-
    work.

    On exit from the form the program will check if there
    are structures in the network that are not in the HLR
    database.  If found, these structure numbers will be
    displayed and you will be given the option of either
    proceeding with the analysis or deleting them from the
    list.

    Associated with each PBS network is a corresponding PBS
    network file located in the database directory.  When a
    network is selected the bridge numbers from that file
    are copied into the file called "hlp.txt" located in
    the TempFiles folder.  PBS network file names are:

      PBS-Network1A.txt,  PBS-Network1B.txt,
      PBS-Network2A.txt,  PBS-Network2B.txt
      PBS-Network3A.txt,  PBS-Network3B.txt,
      PBS-Network4A.txt,  PBS-Network4B.txt

     All of these are simple text files that contain a
     list of structure numbers lying on that network. (The
     mapping system must create these files initially then
     update them whenever a bridge is added to, or removed
     from, one of those networks). The Route Number field
     will reflect the currently selected PBS network.

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V5.0.2  4 May 2010

(1) Structure Data Report

    A Legal Vehicle description has been included on the 
    report as well as the label for the RC+Steel material
    type.  A note is also displayed if the vehicle factor is
    to be excluded from the analysis (all of which were
    previously missing).


(2) Long continuous structures with 2 capacity sets

    The program would crash when analysing long (>10 spans)
    continuous structures with 2 capacity sets.  Fixed.


(3) Simply supported structures with 2 capacity sets & 
    variable WOS

    The program was incorrectly calculating the capacity of
    simply supported structures with 2 capacity sets (the 
    second being used for the 5kph check) and a Working
    Overstress factor > 100% but less than 140%.  Fixed.


(4) Vehicle movement increment

    When analysing continuous structures both HL and Design
    vehicles are moved across the structure in increments
    defined by:

    Increment = Total structure length / 
          (Number of increments per span * Number of spans)

    A user-specified parameter Number of increments per
    span has now been created and replaces the 
    # Lower limit of available disk space item in the 
    default options file (Defaults.txt) and the Default
    Settings tab (in the Options form).  Currently it
    has been preset to 50.

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V5.0.1  31 March 2010

(1) Envelopes of Factored Moments - Continuous bridges with
    no capacities:

    Negative moments (M1, M2, M3, Mcap) in the reports were
    being displayed as positive.  Fixed.


(2) Envelopes of Factored Moments - Continuous slab/box
    bridges with no capacities:

    Capacity values in the reports were being displayed
    incorrectly (although internally they were being calcu-
    lated correctly).  This has been fixed.


(3) Analysis of continuous bridges with variable Ixx

    Continuous bridges for which the moment of inertia (Ixx)
    varied along each span were not being analysed correctly.
    HLR was assuming that each span had a uniform Ixx value
    and was setting it to that of the first section in each
    span.  This has been fixed.


(4) Structure database form  Save & edit options disabled

    Options and features that allow the editing and saving
    of structure data were more comprehensively removed or
    deactivated from the Structure data form.

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V5.0.0  22 Dec 2009   -  Modified for BIS/GIS Interface

(1) Operation via BIS

    Options and features that allowed the editing and saving
    of structure data were removed or deactivated from the
    following parts of the program:  Structure data, Job ID
    tab; Structure item in the main menu  various submenu
    options; dialog boxes that enabled structure data to be
    viewed and edited.


(2) Clearance & Strength Checks

    For bridges that have strength data and vertical clear-
    ance data HLR5 will now perform and report on both
    checks (even if the clearance check fails), unless the
    clearance only flag is ticked, in which case only the
    vertical clearance restriction is reported and the
    analysis for that structure is then stopped.


(3) GPS Coordinates added to Structure Location field

    HLR5 now displays the GPS coordinates in the Location
    field, Structure ID Data tab and the Summary Report
    (Minute) of the Analysis Results window (list of
    restricted bridges).  The GPS coordinates are read from
    the HLP7.txt structure database file and appended on the
    fly to the location field if they are not already 
    incorporated into the location data.  To permanently
    anchor the GPS coordinates into the location field it
    is necessary to view and save the structure data.

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