Civil and Structural engineering

Software Specification

LUSAS Civil & Structural plus

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

Analysis capabilities

  • Linear static stress analysis
  • Linear buckling
  • Natural frequency analysis
  • Linear dynamics including forced response
  • Interactive Model Dynamics
  • Fatigue analysis
  • Linear cable tuning analysis

Includes this software option for new orders:

  • Fast solvers

And when used with these purchased software options also allows:

  • Steel frame design
  • RC frame design
  • RC slab / wall design
  • Advanced Interactive Modal Dynamics (IMD Plus)

  • Nonlinear analysis

  • Dynamic analysis

  • Thermal / Field analysis

  • Geotechnical Analysis / Soil-structure interaction analysis*

  • Heat of hydration analysis

  • Geotechnical / Soil-structure interaction analysis*

  • Tank analysis and design

* when used with the appropriate additional software option(s) - Nonlinear, Dynamics etc.

See below for more details.


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
  • Concrete creep Chinese code
  • User-defined models and others
  • Fast Iterative Solver Technology
  • Fast iterative solver
  • 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 Civil & Structural plus software options

Included for new orders:

Fast Solvers

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

Available for purchase to increase the analysis and design capabilities of LUSAS Civil & Structural 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

RC Slab / Wall design

  • Comprehensive design checks to a large range of international Codes of Practice
  • Strength/ULS and SLS checks based on flexural, twisting and in-plane effects, shear, stress limits, minimum and maximum areas of reinforcement and crack widths or spacing considerations as appropriate for all supported codes
  • Allows for defining load combinations for each design check separately and produces contoured results, detailed table results and rendered calculations for adding to reports

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

Geotechnical analysis

  • Provides a range of soils-specific analysis facilities to enable finite element modelling in 2D or 3D of both ground and structure in a single model.

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.

Composite FRP

  • For structural and bridge applications, modelling of Fibre Reinforced Polymer (FRP), laminated glass, reinforced concrete using the smeared reinforcement technique, and gradual through-thickness masonry arch cracking assessments can be carried out using advanced layered shell elements.

LUSAS Civil & Structural plus product options

The finite element analysis capabilities of LUSAS Civil & Structural plus can be extended by purchasing the following software products:

LUSAS Bridge plus

  • Bridge engineering analysis software with for linear static, fundamental frequency, seismic, dynamic, large deflection, staged construction, creep, prestress, post tensioning and fatigue analysis, rail track - structure interaction, and steel / composite deck design.


  • LUSAS Tank allows engineers to automatically create a range of 2D and 3D finite element models of above ground full containment concrete or double-walled steel circular tanks from user-defined common tank definition data.

LUSAS Civil & Structural software selection

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Software Information

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LUSAS is a trademark and trading name of Finite Element Analysis Ltd. Copyright 1982 - 2022. Last modified: July 04, 2024 . Privacy policy. 
Any modelling, design and analysis capabilities described are dependent upon the LUSAS software product, version and option in use.