Civil and Structural engineering

Software Tour

Advanced elements, materials and solvers

Unrivalled state-of-the-art linear and quadratic element libraries; advanced material models; linear, nonlinear and seismic isolator joint models; and direct, eigen and fast solver options allow all types of structural engineering problem to be modelled and solved as efficiently as possible.

LUSAS high-performance element libraries include:

  • Beams, plates and shells for ordinary reinforced concrete, prestressed concrete, steel and composite construction
  • Solid elements for detailed modelling and studying local effects
  • Elements for cabled stayed and suspension structures
  • Joint elements for linear and nonlinear modelling

Additional element information is given on the product specification page

Advanced general materials

  • Isotropic models including plastic, creep, damage, shrinkage, viscous, two-phase
  • Orthotropic models including plastic, creep, damage, shrinkage, viscous, two-phase
  • Anisotropic and rigidity models
  • Temperature dependent models
  • Concrete models with opening and closing of cracks, concrete crushing, and strain softening based on fracture energy in 2D/3D
  • Concrete creep including AASHTO LRD 7th Edition, CEB-FIP Model Code 1990, EN1992-1-1:2004 Eurocode 2, IRC:112-2011 and creep only for Chinese creep model code.
  • Concrete heat of hydration modelling
  • User-defined models and others

All linear and nonlinear materials include temperature dependency

Geotechnical material models

  • Constitutive soil models include Tresca, von Mises, Drucker Prager, Duncan-Chang, Mohr Coulomb, Modified Cam Clay, and others for use in all types of soil-structure interaction modelling
  • Volumetric deformation soil model (includes consolidation)

Joint material models

Joint material models are used in conjunction with joint elements to fully define the properties for linear, nonlinear and seismic isolator joints
  • Linear joint models include those for spring stiffness only and for general joint properties having spring stiffness, mass, coefficient of linear expansion and damping factor. User-defined force/displacement and axial force dependent curves are supported.
  • Nonlinear joint models include elasto-plastic uniform tension and compression with isotropic hardening, elasto-plastic general with isotropic hardening, smooth and frictional contact, nonlinear user-defined, matrix properties, and others
  • Seismic isolator joint models include viscous dampers (Kelvin and Four Parameter Solid), lead rubber bearings with plastic yield and biaxial hysteretic behaviour, friction pendulum system with pressure and velocity dependent friction coefficient and biaxial hysteretic behaviour, and others


  • Direct and eigen solvers are provided as a minimum in all software products
  • A Fast Solvers software option provides additional solvers for use with particular LUSAS Civil & Structural products

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Any modelling, design and analysis capabilities described are dependent upon the LUSAS software product, version and option in use.