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Modelling with LUSAS

Models are created using feature-based methods and wizards are provided for specific bridge applications. Model attributes such as thickness, material, etc. can be named explicitly, and as they are defined they are displayed in a Treeview. They can then be assigned to selected geometry of the model using the "drag and drop" technique.

Built-in associativity ensures that if the model geometry is amended, all assigned loadings, supports and other attributes are automatically moved to suit. A multi-level undo/redo facility allows quick modelling corrections to be made.

Boolean operations allow complex geometry to be defined by combining, subtracting or intersecting existing Surfaces or Volumes. Surfaces representing holes can be inserted into an existing surface and any mesh arrangement will be automatically adjusted around the inserted opening.

Fleshing (the visualisation of assigned geometric properties) helps ensure that the geometric thicknesses and eccentricities of slabs and the orientation of beam members are correctly defined. 

Libraries of section properties for a variety of standard sections including UK, US, EU, Korean, Australian and Canadian steel sections are provided. Other standard sections and user defined sections can be added with a section property calculator providing section property data for any arbitrary section. A library of common material properties are included and others can be user-defined.

A precast beam section generator produces 2D cross sectional models of country-specifc precast concrete beams including United Kingdom Y, YE, TY, TYE, SY, M, UM, and U beam types, US AASHTO Type II to VI beams, Florida Bulb T beams, and Canadian NU Girders. The option for including the contribution from a slab is provided so that the section properties required in a grillage model can be obtained.

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