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Data Security

Website Terms and Conditions

Software Licensing Terms

Data Security

We are committed to ensuring that your information is secure. In order to prevent unauthorised access or disclosure we have put in place suitable physical, electronic and managerial procedures to safeguard and secure the information we collect.

All data is stored in secure electronic systems accessible only to Oasys staff with both valid network login credentials and specific authorisation to access the system.  Our systems further limit data access by role to ensure data is available only to those who have a specific need to see it.

If at any point you suspect or receive a suspicious communication from someone suggesting they work for Oasys or a website claiming to be affiliated with Oasys, please forward the communication to us or report the incident by email to oasys@arup.com or in writing to Oasys, 13 Fitzroy Street, London, UK, W1T 4BQ as soon as possible.

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 software 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.

Superseded Versions of Terms and Conditions

Oasys keeps copies of all superseded versions of its terms and conditions.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/fax/email/web based support
  • free software updates available via internet download
  • personalised output header for many products

GSA Masterclass on Eigenvector and Ritz Vector Modal Analysis


The webinar reviews modal analysis and illustrate the characteristics of mode shapes and participation factors.

Webinar host

Peter Debney is Chartered Structural Engineer, a member of both the Institute of Structural Engineers (MIStructE) and the International Association for Bridge and Structural Engineering (IABSE), and a visiting lecturer at the University of Bradford. He is a Senior Consultant working for Arup in the Oasys software group as an application specialist for the structural and pedestrian modelling software suites.

About this webinar

When doing modal superposition dynamic responses analysis such as seismic, harmonic, and footfall analysis, a modal analysis needs to be done first. In GSA, there are two options to do modal analysis: one is eigenvector modal analysis (modal analysis) and one is Ritz vector modal analysis (Ritz analysis). This webinar explains the difference and the uses of the two modal analyses.

The webinar reviews modal analysis and illustrate the characteristics of mode shapes and participation factors. Before introducing Ritz analysis, modal superposition dynamic response analysis is summarised and from which the advantage of Ritz analysis is explained. Then the method and steps of doing Ritz analysis are presented and the characteristics of Ritz analysis are summarised. Finally, how to do Ritz analysis in GSA is demonstrated and when to and when not to use Ritz analysis is explained.

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