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Software for Civil, Structural & Geotechnic Engineers, Architects, Surveyors.

LARSA 2000's makes modeling structures and accessing results easier than ever. The front-end has been entirely redesigned since the previous version of LARSA to improve performance, usability, and power.

Features
Advanced 3D graphics
Spreadsheets
Modelling features
Undo/redo
Explorers/Navigation
Reports
plug-ins

Modules
Larsa 2000 Standard
Larsa 2000 Plus
Larsa 2000 4th Dimension -
- For buildings
- For bridges
Larsa 2000 Section composer
Larsa 2000 Design suites

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LARSA 2000/4th Dimension for Bridges

With the release of LARSA 2000, LARSA introduced finite element analysis in the 4th dimension, time. LARSA 2000/4th Dimension for Bridges serves the bridge construction industry, which will benefit from LARSA 2000/4D's construction & collapse analysis, influence-based results, tendons in three dimensions, and time-dependent material properties.

LARSA 2000 is also a powerful front-end (GUI) for the engine. The front-end includes new support for infinite-level undo/redo, fully rendered graphics, and many modeling and results viewing tools. For a full feature list, please see the LARSA 2000 Front-End Feature List.

Analysis Power

Construction & Collapse
Structures evolve as they are built, and they undergo changes when elements fail. Construction & Collapse provides an integrated means of modeling structural changes during construction and hypothetical scenarios of collapse.

Staged Construction Analysis
The modeling implementation of Construction and Collapse, Staged Construction Analysis organizes the evolution of a structure over time.

For complex structures such as cable stayed, suspension and segmental bridges that have many construction stages, the starting, stopping, altering and restarting procedure is unreasonable. Staged construction analysis automates this, saving the user hundreds of modeling hours. Staged construction is also used for analyzing the effects of time-dependent material properties.

Progressive Collapse Analysis
The analysis implementation of collapse, Progressive Collapse Analysis allows for the analysis of a structure whose elements begin to fail.

Hysteretic Beam and Spring Elements
These elements exhibit inelastic material properties after yielding, including hysteretic behavior for loading and unloading. These elements make progressive collapse analysis possible under extreme conditions.

The hysteretic beam element can be used to model columns and beams with inelastic material behavior. The bilinear and tri-linear hysteretic spring elements are ideal for modeling member connections and soil-structure interaction.

 Other 4th Dimension Features

Seismic Isolators and Bearings
Isolator and bearing elements are used to model isolation devices, energy dissipation devices and bearings. They exhibit a nonlinear force-deformation relationship with hysteretic behavior.

The nonlinear time history analysis is essential in the design of bridges for seismic loading after construction. This analysis may include cables, beams and springs with hysteretic material behaviors, and nonlinear seismic isolation elements.

Material Time Effects
The effects of concrete creep and shrinkage, tendon relaxation, and the time-effect on elastic modulus are incorporated into staged construction analysis.

Features for Bridges

Influence-Based Analysis
Because an analysis using codes such as AASHTO LRFD or UK BS5400 requires accounting for varying loaded lengths and UDL intensities, for vehicles with varying axle spacing and variable spaced vehicles, conventional analysis methods would require generation of millions of load cases. Influence-based analysis not only saves the user hours of analysis run time, but also makes possible analyses that could not have been previously performed.

Tendons in Three Dimensions
Post-tensioning tendons are groups of prestressing strands, wires, or rods, which are stressed against concrete members after the concrete is set. In LARSA 2000/4D, tendons can be given any arbitrary path in three dimensions.

One of the essential applications of staged construction analysis is concrete bridge structures with prestressed tendons. Defining these 3D tendons in a large-scale bridge model can be a daunting task, but LARSA simplifies this immensely.

Other Features

Section Composer
The Section Composer is essential in the analysis of any bridge with nonstandard or nonprismatic sections.

Basic Analysis
Basic Analysis Types: Linear Elastic Static, Enhanced P-Delta, Eigenvalue, Response Spectra, Linear Time History, Nonlinear Static, and Moving Load

Standard Element Library: Members, Plates/Shells, Springs

Advanced Analysis
Advanced Analysis Types: Stressed Eigenvalue, Nonlinear Time History, Nonlinear Buckling, Plastic Pushover

Steel and Concrete Design
Code checking and design plugins.