LARSA, Inc., a privately held company based in New York, develops finite-element-based analysis and design software for structural and earthquake engineering of bridges, especially cable and segmental, buildings, and other complex nonlinear structures. Our mission is to provide our clients with the best combination of software and services, customized and integrated into their changing engineering needs.

Our flagship product is LARSA 4D, a 3D structural analysis program boasting unique features including staged construction analysis, analysis scenarios, seismic and inelastic elements, progressive collapse, influence line and surface live load analysis, 3D tendons, bridge geometry control, and a graphical user interface with a lean learning curve.

LARSA 4D specializes in the analysis of nonlinear models with large displacements, such as cable stayed and suspension bridges. LARSA's analysis engine supports both geometric and material nonlinearity and has advanced nonlinear and inelastic elements including cables, nonlinear springs, seismic isolation elements, and hysteretic beams.

LARSA 4D's user-interface is easy to learn, quick to use, and still more powerful than comparable software. All project data is shown and editable both through spreadsheets and graphics.