Engineering analysis and design software
Bridge design and engineering

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Geotechnical / Soil-structure interaction modelling

Unlike some structural analysis software selected LUSAS Bridge (and LUSAS Civil & Structural) software products, when used with appropriate nonlinear, dynamic and thermal/field software options, provide a range of soils-specific and general structural engineering analysis tools to enable finite element modelling of both ground and structure in a single model. Multiple analyses can be solved within each model, and state-of-the-art linear and quadratic element libraries; advanced material models; and linear and nonlinear joint models allow a range of soil-structure engineering problems to be solved.

Dobwalls Bypass tunnel : modelling of backfill procedure

Dobwalls Bypass tunnel : modelling of backfill procedure

  • Useful geotechnical capabilities make use of a range of soil models. Residual soil stress varying with depth can be accommodated providing useful facilities for soil-structure interaction for integral bridges and culverts. Rock joints, pore water pressure dissipation, consolidation modelling, geotechnical problems involving long term excavation, construction in clays, and temporary works can all be solved.
  • Calculate initial stress states providing K0 data and apply to any ground profile.
  • Constitutive soils models include Tresca, Von Mises, Drucker Prager, Duncan-Chang, Mohr Coulomb, and Modified Cam Clay.
  • Two-phase material properties can be added to selected materials to permit modelling the deformation of undrained/fully saturated and fully-drained/unsaturated porous media, and slow consolidation process. Draining and filling curves can also be specified for partially drained materials.
  • Model the variation of soil properties with depth by defining soil profile variations, with LUSAS interpolating between defined locations.

  • Nonlinear springs model active/passive soil joints. Interface meshes permit joining of the soil / structure. Gain / loss of contact, and skin friction can be considered. 
  • Specify a matrix of properties to represent a pilecap sitting on a group of piles in a 3D model.
  • A Tri-linear (active/passive) earth pressure joint material wizard simplifies the modelling of a variety of soil-structure interaction problems, creating a piecewise linear joint material attribute with properties that vary with depth. Multiple attributes can be defined to represent layers of soil or changes in properties due to the presence of water.

General geotechnical and soil-structure interaction capabilities include:

  • Construction sequence modelling - involving excavation / construction with insertion and removal of temporary members used for propping and jacking etc. 
  • Embankment /slope stability assessments and stability checks on adjacent structures due to temporary excavation. 
  • Backfilling of excavations and cut and cover tunnel structures. 
  • Settlement and consolidation including pore water pressure modelling. 
  • Dewatering and seepage modelling of partially saturated fluid flow through porous media, such as seepage of water through an earth dam, where the position of the phreatic surface is of interest. 
  • Modal and time history dynamics involving material damping, nonlinear behaviour, soil plasticity, boundary behaviour and springs/dampers. 
  • Soil-structure interaction analysis including vibration analysis from pile driving impact assessments on nearby buildings and response of buildings to emitted vibrations from rail tunnels. 
  • Lateral displacement analysis of piles and pile groups 
  • Integral bridges

Application areas

Analysis and design

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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 12, 2019.