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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Superseded Versions of Terms and Conditions

Oasys keeps copies of all superseded versions of its terms and conditions.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


Xdisp – Building damage results are sensitive to the spacing of displacement points along a displacement line. Why?

To define accurately the location of the points of inflection, it’s important to state sufficient number of displacement calculation points along the displacement line where a building is specified. Xdisp will calculate and propose the locations of the points of inflection based upon where it calculates the displacements. The locations of the suggested points of inflection are derived by differentiating the curve of the vertical displacement calculated along a given line and finding where the gradient of the resulting function changes from positive to negative. In general, the spacing of displacement calculation points at 1 to 2m spacing is sufficient. If very close spacing is specified (less than 0.5m centres), there is a risk that a significant number of points of inflection may be identified, due to the complex form of equation that is developed to curve-fit the data displacement points. When this is differentiated more points of inflection may be derived than are necessary. The program does include a facility to ‘combine segments’, therefore ignoring selected points of inflection that the program has derived. It may, however, be time consuming for the user to have to combine segments after each analysis due to the specification of too many displacement calculation points.

The building damage assessment method also has a function to specify a trough width limit. The reason for this facility is to enable appropriate deflection ratios and horizontal tensile strains to be calculated in the hogging section of a settlement trough. Usually a limit of 1 to 0.1mm is specified depending on when displacements are considered to be of little concern. If this value is set at zero, smaller deflection ratios and horizontal tensile strains will be calculated than may be appropriate. This is due to the settlement trough extending many metres beyond the 1 or 0.1mm limit to become 0mm (to the many decimal places that Xdisp will calculate results to).

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