Software Tour
Advanced Analysis Features
Analysis capability is dependent upon
the product in use. For details see the Software Specifications.
Seismic and Dynamic Analysis
LUSAS Bridge excels in solving seismic and dynamics problems.
-
 The natural frequency of structures, the effect of
dynamic loading, such as pedestrians on footbridges, and responses due to earthquake
loading can all be readily calculated.
- After first running a frequency analysis you can interactively apply
spectral response data to your structure for a full seismic response analysis for either
SRSS or CQC spectral combinations.
- Forced response, vibration and transient dynamics problems can also
be solved, if you wish, by calculating the structural response for selected loadcases
using the Interactive Modal Dynamics (IMD) results processing facilities.
Interactive Modal Dynamics
 The LUSAS IMD facility
provides a way of rigorously analysing linear dynamic response effects on a bridge or
structure for a large number of possible train crossing speeds or loading events, without
the long analysis solution times associated with traditional analysis methods.
- Forces, moments, displacements, response time histories, and peak
response summaries, both for the whole structure and at selected nodes or elements can be
obtained.
- Selected results can be graphed, or standard contour, vector, or peak
value feature plots can be produced.
Rail
Track Analysis
- The LUSAS Rail Track Analysis option
permits track/bridge interaction analysis to the International
Union of Railways Code UIC 774-3. It allows you to automatically
build models from data defined in MS Excel spreadsheets, run an
analysis, and quickly produce results in spreadsheet or LUSAS
results file formats.
Rail Track analysis
of the Mangyeong Railway Bridge
Nonlinear Analysis
An analysis will often have to take
account of nonlinear materials, geometry, and contact conditions to accurately model the
structural behaviour to obtain the correct load capacity. The nonlinear analysis
capability is one of the key strengths of LUSAS Bridge and provides for:
- Soil-structure interaction, for
example in integral bridges,
- Modelling of lift-off at bearings
and halving joints,
- Time-dependent dynamic analysis,
assessment of impact from vehicles,
- ‘Push-over’ analysis,
- Large deflection in cable
structures, and much more...
Nonlinear modelling of
a plate girder in shear
Staged Construction Analysis For staged construction analysis such as in balanced
cantilever structures, cable stayed and suspension bridges, and the excavation of
material, elements can be activated and deactivated to accurately model the construction
sequence.
Staged Construction
modelling of the Wichita Footridges
Creep modelling
 A CEB-FIP concrete material model to Model Code 1990 allows
creep and shrinkage to be analysed.
- The image (right) shows just a few
exaggerated deformed shapes of a beam and shell model used to carry
out a staged construction analysis (incorporating creep and post
tensioning) to simulate the construction of the deck of a proposed
bridge across the Mississippi River.
Heat
of Hydration analysis
 Heat of hydration
modelling can be carried out of
concrete for a variety of cement types and effects due to the addition of
fly ash and ground granulated blast furnace slag can also be included.
When used in conjunction with Nonlinear, Dynamic, and Thermal software
options the heat of concrete hydration can be computed during a
thermo-mechanical coupled analysis and the temperatures and degree of
hydration can be read in to the mechanical analysis.
Soil-structure interaction Useful geotechnical capabilities make use of a wide
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.
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