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Website Terms and Conditions

Software Licensing Terms

Data Security

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Data Security Notice Updated 27th February 2020

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Website Terms and Conditions

The contents of this web site are protected by copyright and other intellectual property rights under international conventions. No copying of any words, images, graphic representations or other information contained in this web site is permitted without the prior written permission of the webmaster for this site.

Oasys accepts no responsibility for the content of any external site that links to or from this site.

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Software Licensing Terms

Terms and Conditions of Purchase

The full conditions of purchase and maintenance for all Oasys desktop software are set out in the Oasys Software Licence and Support Agreement.

The full conditions of purchase and maintenance for Oasys Gofer are set out in the Gofer SaaS Agreement.

All prices are subject to TAX at the current rate.

Prices and specifications are subject to change without notice – please ask for a written quotation.

Although every care has been taken to ensure the accuracy of all information contained herein, the contents do not form or constitute a representation, warranty, or part of any contract.

Superseded Versions of Terms and Conditions

Oasys keeps copies of all superseded versions of its terms and conditions.

Maintenance & Support Services

Support and maintenance is included with all subscription licences for their full duration.

Annual maintenance contracts are available for software under a perpetual licence, prices are based on a percentage of the most recent list price.

This service includes:

  • telephone/email/web based support
  • free software updates available via internet download
  • personalised output header for many products

GSA — Structural Design & Analysis Software

Oasys GSA is a comprehensive structural analysis program with versatile design capabilities. 
*New in GSA 10 Analysis Building Bridge Suite
Application Programming Interface

Use the COM API with your own code or third-party programs to create, edit, and optimise your structure

Modelling Tools

Text, graphical and automatic creation of geometry and loads

Tapered Elements*

Define entities which vary in size along their lengths

Nonlinear Elements

Compression-only struts, tension-only ties, nonlinear springs, and cables

2D and 3D Elements

Covers all element types in GSA such as 1D, 2D, 3D, and spring elements

2D Members*

Create slab and wall entities in the design layer

Nonlinear Materials

Elastic-Orthotropic and Elastic-Plastic Isotropic materials

Linear, P-Delta, and Nonlinear Analyses

Analyse for geometric and material nonlinearity over large deflections, including dynamic relaxation and explicit solvers

Imperfection Analysis*

Impose imperfections on analysis without modifying the base geometry

Staged Analysis

Add, remove, and change elements and constraints within analyses

Dynamic Analysis & Response

Modal, Ritz, and Explicit analyses, including P-Delta effects, with Response Spectrum, Harmonic, Time History, and Periodic analyses

Buckling Analysis

Modal buckling of 1D & 2D elements; Nonlinear buckling of 1D elements

Wave Loading

Generate wave and current loads on submerged structures

Raft Analysis

Combine structural models with nonlinear soil for foundation design

Footfall Analysis

Calculate accelerations, velocities and response factors from pedestrian loading

RC Design

Design of reinforced concrete slabs and walls to international standards

Fast Slab Reinforcement Calculations*

Generate reinforcement results as user modules

Steel Design

Design of steel beams, columns, and braces to international design codes

Bridge Loading

Lane and vehicle load optimisation for highway and railway bridges


Geometry generation for tension and compression only structures

Fabric Analysis

Analysis of fabric nonlinear materials

Oasys GSA

With Oasys GSA, you can analyse the structural design of any structure which needs to be iterated through many cycles of geometry definition, internal force analysis and code design. GSA gives engineers a versatile analysis and design software that integrates well within traditional and parametric workflows.  

Why should I buy it?

Engineers who analyse and design anything from small structures to complex buildings use Oasys GSA.  

With a wide range of analysis options including a model debugging stability analysis, modal analysis, linear buckling, footfall vibration analysis, explicit nonlinear analysis and form-finding capabilities to meet the demands of any project, GSA allows the user to manipulate and check the model. Bidirectional interoperability with many industry-standard software packages including Revit and Grasshopper allows the software to work seamlessly with traditional and parametric workflows. APIs connect to developer’s scripts. With GSA, versatile design capabilities such as slab bending and axial reinforcement can be calculated for any geometric shape (even curved slabs) with rebar oriented at any angle in the plane of the slab, or steel design checks (including automatic unbraced length calculations) and optimization can be carried out for a large variety of section profiles and codes. There is a customizable set of saved graphical outputs that can be directed printed to calculation packages. 

A wide range of analysis options:

  1. Oasys GSA provides simple and advanced structural analysis of any structure.
  2. GSA enables steel frame and concrete slab design to many design codes.
  3. GSA integrates with Revit, Grasshopper, LS-DYNA, OpenSees and IDEAStatiCa.

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Capabilities of the GSA

Form finding

Finding the correct geometry and prestress forces for tension only structures such as fabric structures, fabric roofs and cable nets is crucial: mistakes lead to wrinkles, flapping, and ponding problems. While some programs will generate geometry that looks nice, GSA will find the geometry that is right. GSA gives you the control to offset the effects of fabric to cable prestress, radial to circumferential stresses, and more.

GSA also enables you to generate the organic geometry for compression-only structures such as grid shells and slender arches.

GSA uses its powerful dynamic relaxation non-linear solver to form find using soap film, force density and structural properties to find the optimum structural arrangement, and then analyse and design it to all the serviceability and ultimate loads.

As designs become more efficient, the resulting structures get lighter and more responsive to human induced vibrations. This means that footfall induced vibration is becoming an important serviceability design requirement for office and residential buildings, foot bridges and staircases: it is an essential requirement for demanding situations such as hospitals, footbridges and laboratories.

GSA enables you to find the footfall response over the whole structure, with full contour plots and detailed graphs showing exactly where the satisfactory and problem areas are. You can thus explore cost-effective design solutions and advise you client on how their structure will respond to human induced vibration.

GSA is perfect for busy foundation designers as it enables you to analyse how your structure interacts with the ground for optimum design. 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.

GSA adds the acclaimed Oasys Pdisp soil pressure displacement engine to GSA Suite’s finite element analysis. The structure then interacts with the ground via piles, rafts or pads so they both work together to carry the load, whatever the structure, whatever the soil. GSA also integrates with Pdisp, importing soil models and exports results for further geotechnical investigation.

Calculate the reinforcement requirements for concrete slabs and walls to international design codes:

  • Australia: AS 4100:1998
  • Eurocode: EN 1993-1-1:2005 Eurocode 3 (including French, Dutch, German, UK, Singapore, and UK fire annexes)
  • Hong Kong: HKSUOS:05 & 11
  • India: ISS 800:1984 & 2007
  • UK: BS 5950-1:2000
  • South African: SANS 10162-1:2011
  • Generic: Stress check

Results are available in various forms, including numeric utilization ratios and calculations as rich text. The different forms of result available mean that the user can avoid information overload, but can still audit the calculations at a very basic level when appropriate. Utilization ratios can be plotted (contoured) on the model just like any other numeric result, so enabling rapid understanding of which parts of a structure are overstressed or are over designed. Calculation results are marked up in colour to draw attention to problems and important results within the calculations.

Analyse structures with large deflections, plastic yielding of materials, snap-through, sway effects, and more. GSA uses the dynamic relaxation method to enable you to analyse structures that other programs will not touch.

GSA 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.

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

Following on from the modal or Ritz analysis, GSA 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.

Advanced interface

The graphics facility in GSA is designed to feel spontaneous in response to the commands of the user. Various single key commands have the effect of producing standard views, adjusting the orientation, scale and content of the drawn structure, windowing, zooming, labelling and annotating the display. Dynamic viewing and animation of results provide powerful tools to aid you in understanding the behaviour of the structure. Graphical output can be sent to a printer or in DXF format for exporting directly to CAD systems

Modelling tools

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, which enables all structural geometry to be rapidly generated and edited.


When the structure is complete, all loading may be similarly generated and displayed diagrammatically.


3rd party links

GSA includes a bi-directional link between GSA & Revit 2015 and 2014, Revit Structure 2013 & Revit Structure 2012. With this Revit users can transfer model information between Revit and GSA with minimal loss of data.


Data from tables can be transferred to and from spreadsheets using the standard cut and paste facilities. The GWA file (ASCII data file) is written as a tab-separated file to facilitate input into spreadsheet programs


Import options

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

Export options

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


Nonlinear elements and materials

Compression-only struts, tension-only ties, non-linear springs, and cables. Elastic-Orthotropic and Elastic-Plastic Isotropic materials.

COM Interface

COM interface 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


GSA analysis types

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


Bridge loading and optimisation     

Automated bridge loading to:

  • Australia: AS 5100 2, M1600, S1600, M1600-Triaxle, SM1600
  • Eurocode: EC1 UK, generic, user defined
  • Hong Kong: SDM
  • UK: – BD37, BD24 HB, BD86 SV TT / Train / 150 / 100 / 80, UIC71, RU, RL, SW/0, SW/2, HA, HB, SV
  • US: AASHTO 17, LRFD 3, H20-44, HS20-44. HL-93

Path and vehicle loading to

  • Australian Highway Loading: M1600, S1600, M1600-Triaxial, SM1600
    • Non-linear analysis of foils and fabrics
    • Zero thickness elements with optional tension only capacity
      • Soap film for fabric structures
      • Force density for cable net structures
      • Applied force for pure compression or tension structures
      • Geodesic, Bar and Free spacer elements
      • Spacer forces from form finding saved as prestress forces for static analysisCombine fabric elements with structural cables and members
        • Eurocode Loading: Generic, UK, user defined
        • UIC and UK Railway Loading: UIC71, RU, RL, SW/0, SW/2
        • UK and HK Highway Design Loading: HA, HB
        • US Assessment Loading: SV
        • US Highway Loading: H20-44, HS-20-44, HL-93


        Footfall analysis – further detail      

        Sensitivity to vibration is becoming increasingly significant as advances in structural design result in lighter structures; the lighter the structure the more sensitive it is to induced vibration.


        Footfall analysis methods

        • Arup / Concrete centre method – Concrete Centre CCIP-016
        • Steel Construction Institute – P354
        • American Institute of Steel Construction – Steel Design Guide 11
        • Staircase method – CCIP-016 & SCI P354


        Form-finding  and fabric analysis

        Dynamic relaxation method with the following options

      • Fabric analysis

    GSA SwitchKeys utility

    A small utility to allow those customers who have multiple variants of GSA shared licences to easily swap between them. Read more about the SwitchKey utility

Explore GSA Applications

Modules in the Suite

GSA Suite

Structural engineers designing buildings, bridges and tensile structures need comprehensive software to get robust results. Tackle any structural engineering challenge with this complete structure design and analysis software package. GSA Suite gathers the benefits of all the GSA variants into one single offering.

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 »

GSA Analysis

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.

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 »

Marina Bay Sands, Singapore

Arup Structural Engineer Juan Maier took advantage of the COM Interface offered in GSA when working on the multi-billion dollar Marina Bay Sands Integrated Resort in Singapore.

View Case Study »

Please fill out the following form to make an enquiry for this software.

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Complete the form available by clicking on the Request a Trial button and add any additional information in the comments section that we may find helpful in deciding whether to authorise a trial. Upon submission of the form we endeavor to get back to you as soon as possible.

  • Any mandatory form questions that are not completed accurately or fully will not be issued with a trial licence.
  • If you have already been issued with a trial licence for this product in the past 12 months please contact us before submitting a request.
  • Trial request approval is entirely at our discretion; Oasys reserves the right to decline a request at any time, and for any reason.

If you’re interested in our software, have some questions or want to know the pricing, we’re here to help. Contact us and one of our advisors will help you find the answers you need.

Simply fill out the contact form with your question and we’ll get back to you as soon as we can.

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Further Information

The trials are limited for 14 days only, and there is no functional limitation. During the evaluation period you will only be able to use the software for test purposes and not for commercial paid work, and for the duration we will support you to get the most out of your test. GSA system requirements can be found in the FAQs.

All we ask from you are some details so we can contact you to issue you with the installation file.

Once you submit your details, a customer service agent will contact you and provide the free trial installer.

Existing customers who are fully maintained can download the latest versions of their software on demand from their personalised customer licensing portal.

Your login ID and Password for the portal is not the same as your website account. You can find your login details in your purchase confirmation email. Alternatively you can request for your login details to be sent to you by emailing [email protected].

This trial program includes all modules except Fabric. To activate these options, select them on the Advanced Features on the Preferences dialog. If you wish to trial form-finding and fabric analysis, please contact us at [email protected] for a licence.

During the evaluation period you will only be able to use the software for test purposes and not for commercial paid work, and for the duration we will support you to get the most out of your trial.

All we ask from you is some details so we can decide whether you are eligible for a trial.

Compatible with most modern day Windows operating systems.

The full conditions of purchase and maintenance are set out in the Oasys Software Licence and Support Agreement. All prices are subject to TAX at the current rate.

Prices and specifications are subject to change without notice – please ask for a written quotation.

Although every care has been taken to ensure the accuracy of all information contained herein, the contents do not form or constitute a representation, warranty, or part of any contract.

By completing and submitting this form you consent to Oasys Limited storing and processing the personal data you have provided. We will use this information to keep you updated about the products requested for customer service and sales analysis. We do not pass your details to third parties to use. For more information visit our privacy policy. You may opt-out at any time by emailing [email protected].

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

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Structural design and analysis software

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12 months Subscription (Pay annually), 36 months Subscription (Pay annually), 12 months Maintenance (Existing users only)

"GSA is definitely the software of choice here for complex structures and for quick checks, and it seems that you are filling in the middle now. Good work!"
Andrew Mole - Arup

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