Software Tour
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.
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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