Engineering analysis and design software
Bridge design and engineering

Software Tour

Modelling with LUSAS

LUSAS Bridge has an easy to use, associative Modeller for modelling / results processing and a fully integrated Solver that can also be used independently.

Modelling features

  • The user interface is a full native Windows implementation providing an Open Interface to ActiveX compliant Windows software such as Excel, Access, Word and other software.

  • Customisation of menus, toolbars and dialogs plus the ability to create your own wizards with Visual Basic Scripting provides limitless potential to tailor the software to specific needs.

  • Models are formed of layers where the visibility and properties of each layer can be controlled and accessed via the layer name held in a Layer treeview, one of a number of treeviews used to organise and access model data.

  • Models are created using feature-based geometry methods (points, lines, surfaces and  volumes)and CAD import / export is supported. As the model is built up, model features may be grouped together and manipulated to speed up data preparation or to enable parts of the model to be temporarily hidden.

  • A model merge facility allows design teams to create separate models of specific parts of a structure and then combine them a a later date into one master model.

  • Model attributes such as thickness, material, loading, mesh/element type etc. can be named explicitly. Once defined they appear in an attributes treeview ready to be assigned to selected geometry of the model using the "drag and drop" technique.

  • Automatic meshing with an easy-to-use mesh refinement capability.

  • Built-in associativity, a key feature of the LUSAS Modeller, ensures that if the model geometry is amended, all assigned loadings, supports, assigned mesh and other attributes are automatically updated to suit.

LUSAS Treeview

  • Fleshing (the visualisation of assigned thicknesses or section shapes) helps to ensure that the thicknesses and eccentricities of slabs and the orientation of beam members are correctly defined.

  • Datatips reveal useful model information such as assigned properties when the cursor is positioned on top of a geometry feature.

  • The OpenGL implementation provides fast graphical displays. Multiple graphical windows allow simultaneous displays of different parts of the model at different orientations. Powerful cursor selection options and pan, zoom, dynamic rotation and pre-defined views allow for easy viewing and editing of your model.

  • A multi-level undo/redo facility allows quick modelling corrections to be made.

  • Basic geometry data from third-party BIM/BrIM files (*.ifc) can be imported to create a feature-based geometry model in LUSAS. Both BIM/BrIM Structural domain files (*.ifc) and BIM/BrIM Architectural domain files (*.ifc) are supported for export.

  • Detailed on-line dialog help links to additional reference manual material to provide you with the most appropriate level of assistance at all times.


A number of wizards allow for rapid modelling, generation of loading conditions, and viewing of results. 

  • A grillage wizard enables the rapid generation of a wide variety of orthogonal, skewed and curved multi-span grillage arrangements. Cracked sections can also be included.

grillage_sequence.gif (36022 bytes)

  • Wizards for the calculation of critical road and rail loading configurations, design combinations, and dynamic pedestrian loading are available, along with loadcase generators for moving vehicle and train loads across a model.
  • Animation, graphing and print results wizards take users through the processes required to display results.


Section libraries and section property calculators

Section libraries and a range of section property calculators help to provide for straightforward modelling of grid/grillage and beam models.

Standard Steel Section Libraries

Steel section libraries include those for:

  • United Kingdom

  • United States of America

  • European Union

  • Korea

  • Australia

  • Canada

  • China 

Precast Beam Section Generators

A precast beam section generator calculates section properties of a range of country-specific 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

  • Canadian NU Girders. 

An option for including the contribution from a slab is provided so that the section properties required in a grillage model can be obtained.

Standard section property calculators

Section properties for common section shapes such as rectangular, circular, I-shape, T-shape, L-shape, T-Shape and Z-shape sections can be easily calculated.

Riveted and welded sections

These include: riveted I-section, T-shape, box, trough and cruciform sections, riveted boxes from I sections / channels, I-section with channel, or doubler plates, and welded plate boxes.

Arbitrary section property calculator

Section property data for any drawn shape or collection of section shapes can be calculated using an arbitrary section property calculator.

For thin box sections, only the points and lines that define the centrelines of the plated members, and the geometric thickness of each line need to be initially defined for section property calculation to take place.

Compound section property calculator

Compound sections can be defined from existing library sections. These can be positioned relative to each other and can have differing material properties assigned.

Infilled/ Encased Sections

The Infill/Encased Section Property Calculator supports the following section types:

  • Filled box
  • Filled stiffened box
  • Filled pipe
  • Filled stiffened pipe
  • Encased hollow box - with rectangular or circular encasement
  • Encased filled box - with rectangular or circular encasement
  • Encased hollow pipe - with rectangular or circular encasement
  • Encased filled pipe - with rectangular or circular encasement
  • Encased I-beam - with rectangular or circular encasement
  • Encased Cross I-beam - with rectangular or circular encasement
  • Encased Combined-T-beam - with rectangular or circular encasement

Arbitrary section property calculator

Section property data for any drawn shape or collection of section shapes can be calculated using an arbitrary section property calculator.

Single and Multi-Cell Pre-cast Box Section Property Calculator

This enables section properties of a single or multiple box cross section (with and without voids) to be calculated from user defined dimensional data. The section shapes can be defined either as a simple cross-section or as complex section created from as many lines as are required to form a suitable representation of the true cross-sectional shape.

Single simple box section with void Multiple complex box section with void

Tapering beams and multiple varying sections

  • Tapering beams can be easily defined by specifying section properties for each end.

  • Multiple varying sections can be defined along a path of lines allowing straightforward building of models for bridges having curved soffits or for arch structures having varying cross-sectional thicknesses.

Definition of a linear tapering beam Definition of a multiple varying section

Use of the tapering beam and multiple varying section facilities enables simple prototype and detailed staged construction models of bridges formed of tapered box sections to be created in a very straightforward manner.

Preliminary prepartion of a staged construction model

Library browser

A library browser permits transfer of attribute data, such as mesh, geometric, material, etc., between models.

Advanced elements, materials and solvers

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Software Information

  Bridge / Bridge plus
green_arrow.gif (94 bytes) Software overview
green_arrow.gif (94 bytes) Modelling in general
green_arrow.gif (94 bytes) Advanced elements, materials and solvers
green_arrow.gif (94 bytes) Load types and combinations
green_arrow.gif (94 bytes) Staged construction modelling
green_arrow.gif (94 bytes) Geotechnical / Soil-structure modelling
green_arrow.gif (94 bytes) Analysis and design
green_arrow.gif (94 bytes) Design code facilities
green_arrow.gif (94 bytes) Viewing results
green_arrow.gif (94 bytes) Software customisation

  Bridge LT
green_arrow.gif (94 bytes) Software overview

  Choosing Software
green_arrow.gif (94 bytes) Software products
green_arrow.gif (94 bytes) LUSAS Bridge LT
green_arrow.gif (94 bytes) LUSAS Bridge
green_arrow.gif (94 bytes) LUSAS Bridge Plus
green_arrow.gif (94 bytes) Software selection
green_arrow.gif (94 bytes) Software options

green_arrow.gif (94 bytes) Videos
green_arrow.gif (94 bytes) Case Studies

  Additional Information
green_arrow.gif (94 bytes) Linear and nonlinear buckling analysis
green_arrow.gif (94 bytes) Curved girder analysis
green_arrow.gif (94 bytes) Integral or jointless bridges
green_arrow.gif (94 bytes) Post-tensioning
green_arrow.gif (94 bytes) Concrete modelling
green_arrow.gif (94 bytes) Interactive Modal Dynamics
green_arrow.gif (94 bytes) LUSAS Programmable Interface (LPI)

  Example applications
green_arrow.gif (94 bytes) Footbridge design
green_arrow.gif (94 bytes) Rail solutions
green_arrow.gif (94 bytes) Soil-Structure Interaction Modelling

  General information
green_arrow.gif (94 bytes) Hardware specification
green_arrow.gif (94 bytes) Licencing and Networking options
green_arrow.gif (94 bytes) Software prices
green_arrow.gif (94 bytes) Documentation
green_arrow.gif (94 bytes) Links page

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LUSAS is a trademark and trading name of Finite Element Analysis Ltd. Copyright 1982 - 2019. Privacy policy. 
Any modelling and analysis capabilities described on this page are dependent upon the LUSAS software product and version in use. Last modified: July 25, 2019.