User Area
> Advice
Bridge
Loading Notes
Pre-defined HB loading
is available using the menu item:
Bridge
> Bridge Loading > United Kingdom ... > (click) Abnormal load (HB
Vehicle) ...
You
may choose the appropriate definition from a drop down list and click
"OK" to add this definition to your loading attributes
TreeView. Using
"Apply" adds the definition to your loading attributes
TreeView and keeps the form on the screen so that you can add another
without navigating the menu again.
You
may place your
discrete loads on your model by assigning them
to point features, which do not need to be connected to
the mesh of your model in any way.
Alternatively, vehicles can be defined using the menu item:
Attributes
> Loading > Discrete ... > Point [enter coordinates and loads using
tab to extend to more lines, or by pasting from another Windows
Application]
Pre-defined HA loading
is available using the menu item:
Bridge
> Bridge Loading > United Kingdom ... > (click) Lane load (HA
load) etc
See
the notes on HB loading above for further details of how to use the
loading which will be generated.
Alternatively,
HA
lane loads and HA knife edge loads can be defined using the menu item:
Attributes
> Loading > Discrete ... > Patch [enter coordinates and loads using
tab to extend to more lines, or by pasting from another Windows
Application]
You may produce almost circular patch loads
by using 8 noded patch load
definitions. You may find it useful to refer to the Help menu item:
Help
> Help Topics > Contents > Modeller Reference Manual >
Chapter 5 : Model Attributes > Loading > Discrete loads >
Example 4.
A curved sided quadrilateral defined using 8 coordinates
When defining
discrete loads such as these, many coordinates are
required. However, any Point features selected before
initiating the Discrete load dialog are automatically
entered as point coordinates in the discrete load dialog.
This can make the operation less labourious, since Point
features may be entered by cursor position or using the
transformations in the Modeller interface: translation,
rotation, scale etc.
Discrete
loads, when assigned, may "include full load"
or "exclude" (drop down menu). This can be very
useful when dealing with (for example) footways which overhang
the grillage extents.
Influence
lines / Influence surfaces
Influence lines are an essential part of a bridge analysis to BD37/88. Refer to the note under Table 13 and clause 3.2.5.
There are notes on the application of influence lines, influence surfaces and Maxwell's reciprocal theorem in the "Help menu" item:
Help
> Help Topics
> Contents > Autoloader Reference Manual > Appendix A - Influence Surfaces And How To Use Them
Autoloader
is an option in LUSAS Bridge:
Find
out more | See
something of the Autoloader interface | Advice
on using Autoloader
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