LUSAS Bridge is a world-leading finite element analysis software application for the  analysis, design and assessment of all types of bridge structures. 

LUSAS Bridge is used by engineers worldwide for all types of bridge analysis, design and load rating from simple slab deck bridges, steel trusses, integral bridges and bow-string arch bridges, through to box girder, movable, cable stayed and suspension bridges. It is used routinely for all types of “architectural” bridges with slender or curved shapes, and especially where dynamic loading is important.










Use for all bridge types:    

•  Slab decks / Slab / Beam decks/ Truss Bridges
•  Composite decks / Straight or curve
•  Integral Bridges / Composite Integral Bridges
•  Cast insitu span-by-span construction
•  Precast segmental span-by-span erection
•  Cast insitu balanced cantilever construction
•  Precast segmental balanced cantilever construction
•  Progressive erection of precast segmental decks
•  Incremental launching
•  Balanced placement for cable-stayed bridges
•  Extradosed bridges
•  Suspension bridges
•  Rail Track Analysis to UIC 774-3
•  High Speed Rail Bridges
•  Buried Structures

Use for:

Innovative new design

• Cost effective bridge assessments

• Cost-saving re-design

• When design codes can’t be used

• Ultimate load assessments

• Development of retrofit solutions

• Erection engineering

Modelling and Analysis of Jointless and Integral Abutment Bridges

  • Brockhampton Road BridgeModelling and analysis  alternatives
  • Soil-structure interaction
  • Results viewing options

Integral or jointless bridges are well known to eliminate the maintenance and salt corrosion problems associated with bridges having movement joints and bearings. However, the biggest uncertainty with the design of these types of structures is the reaction of the soil behind the abutments and adjacent to the foundation piles caused by seasonal thermal expansion of the various bridge components acting together. LUSAS Bridge, unlike some systems, allows you to accurately analyse the soil-structure interaction of the piles and bridge structure in one model and comprehensive results processing features give you with all the tools you need to view and interpret your results

 . ani_integral_bridge_1     ani_integral_bridge_2


Prestress and post-tensioning with LUSAS

Single and multiple tendon prestress wizards in LUSAS calculate equivalent nodal loading due to tendon prestressing or post-tensioning and assign these forces automatically to beam, plane stress or solid elements of a model for an active loadcase. Computation of tendon forces can be carried out in accordance with AASHTO-LRFD, BS5400, Eurocode EN1992 and JTG D62-2004.Post-tensioning in LUSAS is suitable for beams, slabs, and volumes and incorporates time-stage with creep and shrinkageSpan-by-span, progressive placement, balanced cantilever and incremental launching time staged construction methods are supported.

Externally post-tensioned box girder shell model                                 Balanced cantilever


ani_postten_external_tendon                       balanced_cantilever_shell_results

 Span-by-span                                                                                                   Progressive placement with jacking-up of supports


202_staged_model_and_results                         Staged_Constructiion_Jacking_moment_stress


LUSAS Rail Track Analysis

LUSAS Rail Track Analysis option permits track/structure interaction analysis to the International Union of Railways Code UIC 774-3 and to the relevant sections in Eurocode.

LUSAS Traffic Load Optimization

The vehicle load optimization facility interrogates each influence surface and calculates the critical loading pattern. The critical loading pattern can be optionally displayed prior to calculating loading effects.

•  Loadings for straight, curved or straight + curved carriageways
•  Live load optimization to the chosen design code:
•  Eurocode EN1991-2

Soil-structure interaction/ Geotechnical Capabilities

Useful geotechnical capabilities make use of a range of soil models. Constitutive soil models include Tresca, von Mises, Drucker Prager, Modified Mohr Coulomb, Modified Cam Clay.

Rock joints, pore water pressure dissipation, consolidation modelling, geotechnical problems involving long term excavation, construction in clays, and temporary works

  • Soil-structure interaction modelling
  • Staged construction analysis of all backfilling and overfilling stages

LUSAS is used in all areas of civil, structural and bridge engineering for linear, nonlinear, seismic, blast, buckling, impact and thermal/field analysis. It can be used on all types of structures from simple slabs, buildings, towers, tanks and bridges through to heavy civil engineering structures such as dams, docks and tunnels. 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


Staged construction modelling of the arch system installation and backfilling process

ani_bebo_dobwalls_rslt_displacement      slope_inc4_775cut_and_cover_775

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