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Data Security Notice Updated 27th February 2020

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GSA Analysis — Structural Engineering Analysis Software

GSA Analysis is used around the globe on all manner of projects. It provides engineers with a highly intuitive nonlinear analysis software tool to help realise the potential of design, no matter the challenges.

Perform day to day analysis and solve complex engineering problems

From beams to tall buildings, from simple structures to the most complex, GSA Analysis is the structural engineering analysis program to help solve engineering problems.

With this software, you can efficiently and effectively carry out 3D linear, P-delta, non-linear static analysis and much more. You can also carry out Modal and Ritz vibration analysis with or without the stiffening effects of loads, including seismic and time-history assessment. GSA Analysis also includes soil-structure interaction using either Oasys Pdisp engine or 3D soil brick elements.

How GSA Analysis Works

Input: Create structural finite element analysis models using CAD and BIM links, directly in the table or graphical views, or using your own scripts via the Application Programming Interface. Assign linear and nonlinear materials to a variety of element types, whether beams from catalogues, standard shapes, profiled slabs, or your own special requirements. Add static, dynamic, prestress, or thermal loads and analyse the effect. Additionally, you can export from Revit to GSA Analysis and update Revit from your GSA Analysis models. You can even create new Revit models from GSA.

Analysis: GSA includes several solvers, including:

  • Matrix-based stiffness method for static and p-delta analyses
  • Dynamic relaxation and explicit solvers for nonlinear static and dynamic problems
  • Eigenvector solvers for modal vibration and buckling analyses
  • Dynamic response analyses for seismic response spectrum or time history, plus harmonic and periodic vibrations
  • Soil structure interaction for rafts and piled structures
  • Diagnostic analyses for resolving modelling problems

Output: Output forces, moments, deformed geometry, and other results in graphical views, tables, and graphs. Export analysis models to LS DYNA, model changes to Revit, or text and numbers to Office documents.

Key Features & Benefits

  1. Produce fast and accurate results from the simplest beam to the most complex building, all within the one environment
  2. Work with 0, 1, 2, & 3D elements to model just what you need to analyse
  3. Integration with Autodesk’s Revit Structure and other BIM software will ensure high integrity of model transfer and accurate model coordination
  4. Analyses include Linear and Nonlinear Static, Dynamic, and Buckling analyses, plus Dynamic Response, Soil-Structure Interaction, and Analysis stages

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Capabilities of GSA Building

Visit the full change log for all improvements

Redesigned and streamlined user interface – Quick access to popular tasks with customisable panes and toolbars.

New beam section – Improve interoperability by allowing you to define any section once and then being able to reuse it within any Oasys software program.

New Beam Section

Materials – Define design grade materials at the analysis and model building stage. Build user-defined materials.

Grid loading – Work with 1D or 2D elements, allowing patch, line, and bridge loads on meshes.

IFC import & export with GsRevit – Interchange data between a variety of BIM friendly platforms with GSA 9.0’s new IFC import and export. As well as new Revit integrations allowing you to map entities with ease.

Explicit solver – A new analysis solver for dealing with short time-span, high frequency dynamic non-linear situations has been implemented along with improved load curves functionality.

Seismic analysis – New advanced seismic analysis features include response spectrum analysis with improved display, tools and combinations.

3D solid elements & soil structure interaction – Now includes 3D solid (brick) elements allowing a wide range of structural properties to be simulated. New Contact and Damper element types have been introduced to model dynamic problems such as modelling contact between different elements.

Brick Element: Diagram – Surface Contour – Filled Contour

Raft Analysis – The Raft Analysis feature is now available in all GSA variations. This analysis type is perfect for busy foundation designers. This easy-to-use feature combines non-linear structural and geotechnical models to calculate accurate settlements, soil pressures, bending moments and other structural stresses in a fraction of the time.

Design improvements – Design materials have improved functionality and create more consistent models.

Steel member design – Improved member design that provides analysis releases along with in-depth functionality options with instant results in report view.

 Steel Design Member libraries

New chart views, reporting and graphics – In addition to the instant report view results, chart view functionality is improved with easy updating and exporting of curves. Graphics have been improved making your 3D model and 2d graphic look even better.

New Chart Views

Improved Graphics

API improvements – New features include direct objects for Members that lead to faster access and productive code development, expansion of existing objects, and the ability to run automated design from the API using the new Design Task functionality.

Nonlinear analysis

Analyse structures with large and very large deflections, plastic yielding of materials, snap-through, sway effects, and more. GSA Analysis uses the dynamic relaxation method to analyse structures that are too large and complex for other programmes.


Buckling analysis

GSA Analysis enables you to calculate the buckling load factors on a range of structures, from complex frames to shell structures and lateral torsional buckling of plate girders. It also includes non-linear buckling effects so you can plot the deflections of columns and struts against load to accurately assess safety factors.


Dynamic analysis and response

GSA Analysis includes both modal analysis for calculation of the natural frequencies of your structure and Ritz analysis specially designed for seismic response calculations. You can choose to include axial load effects to change stiffnesses in both these methods.

Following on from the modal or Ritz analysis, GSA Analysis enables you to calculate the structural response using a number of dynamic post processors, including seismic response to multiple international codes, linear time history, harmonic loads for vibrating machinery, and more.



With staged analysis you can assess the model at any stage in construction, remove elements, and change sections and restraints, coordinated in a single model.


P-delta Analysis

  • Static P-delta (p-delta by own load case, different load case, or previous analysis case)
  • Non-linear static
  • Dynamic analysis
    • Modal
    • Modal P-delta
    • Ritz
    • Ritz P-delta

GSA offers a wide range of structural analysis types

  • Static analysis
    • Linear Static
    • Static P-delta (p-delta by own load case, different load case, or previous analysis case)
    • Non-linear static
  • Dynamic analysis
    • Modal
    • Modal P-delta
    • Ritz
    • Ritz P-delta
  • Dynamic Response
    • Response spectrum
    • Harmonic
    • Linear Time History
    • Footfall
  • Buckling
    • Modal / eigenvalue
    • Non-linear member buckling
  • Mass analysis
  • Form Finding
  • Analysis envelope
  • Model stability diagnostic analysis

Analysis features:

  • Wizards to guide users in setting up data and analyses
  • Solution methods
    • Sparse Direct & Sparse Parallel Direct
    • Conjugate Gradient
    • Active column
    • Dynamic relaxation
  • 2D skeletal frame and grid analysis
  • 3D skeletal frame and shell structural analysis
  • Non-linear
    • Strut and tie elements, fabric elements
    • Materials
    • Load increments
  • Analysis in construction stages
  • Two dimensional and axisymmetric analysis
  • Large capacity
  • Efficient and stable solution algorithms
  • Analysis of applied load, applied displacements and settlements
  • Export of data to other analysis programs
  • Selective storage of results
  • Element pre-load by prestress for initial p-delta effects

Analysis stage specification:

  • included elements per stage
  • element properties per stage
  • constraints per stage

When an analysis is requested the data are checked for inter-module consistency. If errors are detected, a report is prepared and the program returns to the data editing options; if not, the program proceeds with the analysis with progress being reported to the screen throughout

Analysis control

  • analysis is specified and controlled by analysis tasks
  • default analysis task is set up automatically for typical analysis: linear static analysis of all load cases
  • explicitly defined analysis tasks are defined via the analysis wizard
  • pre-analysis data checks check for inter-module consistency, reporting to the report view
  • report view messages link to related data
  • pre-analysis checks can be invoked explicitly
  • several analysis tasks can be queued for batch analysis

Case control

  • Load cases
    • load container
  • Analysis cases
    • result container
    • may be described in terms of compound load cases
  • Combination cases
    • described in terms of compound analysis cases
    • descriptions may reference other combinations
    • results calculated for combination cases on-the-fly
  • Enveloping
    • described as a special combination case
    • analysis envelopes enable enveloped results to be stored


GSA combines GSA structural model with a 3D brick or Pdisp soil model to calculate the soil structure interaction.

  • Direct finite element analysis using brick elements and friction spring interaction elements
  • Iterative analysis using the GSA and Pdisp solvers (does not need the installation of Pdisp)
  • Specify soil properties and locations
  • Specify soil-structure geometry
  • Raft & Pile soil structure interaction

Find how your structure interacts with the ground for the optimum foundation design

Raft is perfect for busy foundation designers. This easy-to-use software combines non-linear structural and geotechnical models to calculate accurate settlements, soil pressures, bending moments and other structural stresses in a fraction of the time.


  • Multiple soil profiles
  • Multiple soil zones
  • Linear or nonlinear soils
  • Pile soil interaction coefficients (p-y, t-z, q-z)
  • Additional soil loads
  • Pdisp import/export


For regular structures, a Data Generation wizard will allow the user to specify the structure in terms of few key parameters and automatically generate the model data. For more complex structures structural geometry and loading data may be input through either the graphical data generator (“Sculpt”) or a more traditional spreadsheet format

Sculpt enables all structural geometry to be rapidly generated and edited on the screen using a cursor controlled by a mouse. Dynamic viewing makes it possible to adjust the model as required

When the structure is complete, all loading may be similarly generated and displayed diagrammatically. Structures of complexity varying from simple to large skeletal frame models can be generated and complex 2D element meshes can be generated using the automatic mesh generation facilities

The alternative spreadsheet method incorporates many useful features for the generation and copying of numerical data. Text input is normally specified by selection from a list of available items rather than by entering numeric codes.

The API enables GSA to be driven from a spreadsheet macro or other external program. In addition, the command line interface enables GSA to be driven from batch files.

Import options

  • IFC
  • AutoCAD DWG / DXF
  • CIMsteel CIS/1
  • Revit Structure (see below)
  • Pdisp

Export options

  • ADC
  • ASAS
  • AutoCAD DWG / DXF
  • CIMsteel CIS/1
  • OpenSees
  • Revit Structure
  • SAP2000
  • Steel Member CSV
  • Pdisp

Following several requests from customers we have developed a small utility to allow those customers who have multiple variants of GSA shared licences to easily swap between them.

  1. This document refers to the utility installed with GSA version 9.0. For any earlier version, please contact us for details.
  2. Activate one of your GSA keys as follows
  • Open GSA
  • From the ‘Help’ menu choose ‘About GSA’
  • Click on ‘Manage License’
  • Click ‘Activate’
  • Enter the License Key & Password for the first variant of GSA that you have
  • You do not need to repeat these steps for the other variants of GSA that you have as GSA will find these in the License Database
  • Close the program
  1. When you next open the program, the variant that opens will be the one that you activated the key for last.
  2. To change the variant you wish to open, close GSA and run Oasys Key Switcher
    (Closing GSA is important to stop activations becoming locked on your machine). The Switch Keys utility won’t open if you are already running GSA 9.0.
  • For Windows 7 you can run Oasys Key Switcher from ‘Start > All Programs > Oasys GSA > Oasys Key Switcher
  • For Windows 8 and 10 you can find Oasys Key Switcher on your ‘Apps’ screen

5. Select the variant you wish to run and then open GSA. Each time you open GSA after this, it will run the last activated variant until you run Oasys Key Switcher again and select another variant.

Explore GSA Analysis Applications

Modules in the Suite


Oasys GSA is a comprehensive structural analysis program with versatile design capabilities.

Find out more »

GSA Building

GSA Building is part of the Oasys General Structural Engineering suite and combines steel and concrete design, footfall, and soil-structure interaction analysis in the same building design software package. With this intuitive software, you can design structural models with skeletal frames and two-dimensional finite elements, enabling you to design and analyse even the most complex buildings.

Find out more »

GSA Bridge

The perfect tool for busy bridge designers, GSA Bridge automates the optimisation of bridge loads (such as vehicle and lane loading) to a variety of international codes and checks for pedestrian footfall vibration. With a wide range of structural analysis types and 3D and 2D graphics for post-processing, bridge design analysis has never been easier.

Find out more »

Melbourne Olympic Park Stadium

The new soccer stadium will allow soccer and rugby fans to get close to the action like never before, rather than conforming to the geometric restrictions of Melbourne's much-beloved oval pitch stadiums, where 'Aussie Rules' football and cricket reign supreme.

View Case Study »

Please select what type of licence you would like to purchase

GSA – Analysis

USD $3,863.16USD $9,488.89

GSA Analysis is used around the globe on all manner of projects. It provides engineers with a highly intuitive nonlinear analysis software tool to help realise the potential of design, no matter the challenges.

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