Engineering analysis and design software
Bridge design and engineering

Software Specification

LUSAS Bridge plus

An extended bridge analysis system which includes all of the elements, material models, modelling, analysis and results processing capabilities of LUSAS Bridge and has additional advanced elements allowing increased analysis capabilities.

Analysis capabilities

  • Linear static stress analysis

  • Linear buckling

  • Linear cable tuning

  • Natural frequency / eigen analysis

  • Linear dynamics including forced response

  • Interactive Model Dynamics

  • Fatigue analysis

Includes these software options for new orders:

  • Fast solving capability

  • Vehicle load optimisation

And when used with these purchased LUSAS Bridge plus software options also allows:

  • Steel frame design

  • RC frame design

  • Steel and composite deck design to Eurocodes

  • Advanced Interactive Modal Dynamics (IMD Plus)

  • Nonlinear analysis

  • Dynamic analysis

  • Thermal / Field analysis

  • Heat of hydration analysis

  • Rail track analysis

  • Geotechnical / Soil-structure interaction analysis*

* when used with the appropriate LUSAS Bridge plus software option(s).

See below for more details.


  • All elements, material models, modelling, analysis and results processing capabilities included in LUSAS Bridge

And in addition:

  • An extended advanced high-performance element library


  • Curved bars

  • Curved thick + thin beams (including curved cable capability)

  • Curved thin semiloof shells

  • Curved thick + thin shells

  • Curved solids (high order)

  • Axisymmetric solid continuum with non-axisymmetric loading

  • Hygro-thermal 

  • Phreatic surface

  • Non-structural masses

  • Interface

  • Two-phase

  • Specialised material models including:

  • CEB-FIP Model code 1990

  • Codifed creep and shrinkage

  • User-defined models and others

  • Fast Iterative Solver Technology

  • Fast solvers

  • Attributes

  • Specialised materials

  • Slideline contact modelling

  • Activation and deactivation facility for staged construction analysis

  • Age facility

  • Utilities

  • Variation of loading using load curves

  • Fourier analysis

LUSAS Bridge plus software options

Included for new orders:

Fast Multifrontal Solvers

  • Fast Multifrontal Direct Solver
  • Fast Multifrontal Block Lanczos Eigensolver
  • Complex Eigensolver
  • Fast Parallel Direct Solver
  • Fast Parallel Iterative Solver

Vehicle Load Optimisation

  • Rapidly reduces load assessment times
  • Extends vehicle loading capabilities of LUSAS Bridge
  • Identifies critical vehicle and train (rail) loading patterns for a selected design code

Available for purchase to increase the analysis and design capabilities of LUSAS Bridge plus:

Steel Frame Design

  • Design code-based results visualised as Utilisation ratios on members
  • Design summary results produced for selected members and loadcases
  • Generate formatted design reports, showing calculations made and referencing clauses and equations from chosen code

RC Frame Design

  • Design checking of regular and arbitrary shaped reinforced concrete members subject to bending and axial force
  • Design code-based results visualised as Utilisation ratios on members
  • Produce a tabular summary of results for selected members and loadcases, view detailed results and generate interaction diagrams

Steel and Composite Deck Designer

  • Carries out design checks for multiple sections on steel and composite bridge decks to the Eurocodes

IMDplus Analysis

  • Multiple event assessment
  • Linear dynamics effects

Nonlinear Analysis

  • Large displacement, large rotation and large strain geometric nonlinearities
  • Material nonlinearity including plasticity, concrete, damage, volumetric, geotechnical, rubber, creep, temperature dependent, and user supplied models
  • Incremental, iterative (MNR or NR), line search and arc length solution procedures
  • Follower forces
  • Slideline/slidesurface contact algorithms

Dynamic Analysis

  • Spectral and forced response
  • Modal or Rayleigh damping
  • Transient dynamics
  • Automatic time step selection
  • Nonlinear dynamics
  • Time dependent materials and loading

Thermal / Field Analysis

  • Steady state and transient
  • Linear, nonlinear and field dependent material models
  • Automatic time steps
  • Link, line, plane, axisymmetric and solid field elements

Heat of Hydration Analysis

  • Models the heat of hydration of concrete for a variety of cement types. 
  • Includes effects due to the addition of fly ash and ground granulated blast furnace slag
  • Permits hygro-thermal analysis to determine time- and age-dependent deformations, stresses, crack-widths and more...

Rail Track Analysis

  • Track/bridge interaction analysis to Union of Railways code UIC774-3
  • Automatic building of models
  • Calculates stresses and forces in track from thermal and train loading

LUSAS Bridge plus product options

The finite element analysis capabilities of LUSAS Bridge plus can be extended by purchasing the following software product:

LUSAS Composite

  • Composite engineering analysis software with advanced shell and solid composite elements for all types of composite engineering

LUSAS Bridge software selection

Find out more

Contact us for a quotation


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: August 02, 2019.