Terms & Conditions

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 [email protected] or in writing to Oasys, 8 Fitzroy Street, London, UK, W1T 4BJ 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 desktop software are set out in the Oasys Software Licence and Support Agreement.

The full conditions of purchase and maintenance for Oasys Gofer and Oasys Giraphe are set out in the Gofer SaaS Agreement  and the Giraphe 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Superseded Versions of Terms and Conditions

Oasys keeps copies of all superseded versions of its terms and conditions.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


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Connaught Tunnel

Software Used on this Project

Oasys GSA helps bring Connaught Tunnel back into service on the Elizabeth Line

Services on the Elizabeth Line, Crossrail’s new railway for London and the South East, start between 2018 and 2020. Much has been written about its network of new tunnels under London, yet a major proportion of the construction work has involved reusing disused rail infrastructure and so has presented engineers with new challenges. This has called for fast and flexible software tools.

This remarkable project has demonstrated the benefits of software tools that allow for analyses to be adapted for temporary conditions quickly and easily, which is one of the core benefits of Oasys GSA.

Typical of these refurbishments is the Connaught Tunnel on the former North London Line branch to North Woolwich, originally built in 1878 and closed to passenger traffic in December 2006.

Work to breathe new life into the 550m tunnel, which runs below the Royal Docks passage, has now been completed. It has involved the total replacement of twin, brick-lined single-track tunnels with a single, twin-track concrete box accommodating trains and overhead line equipment (OLE) that has been built partly in situ and partly in cofferdam.

The new concrete box was designed to accommodate lateral soil pressure and a roof surcharge. It accommodates the dead weight of the track and superimposed live loads from trains, as well as uplift from ground water. It has also been checked for the effects or predicted changes in groundwater.

Oasys GSA output showing bending moment distribution in temporary condition

That said, the analysis for its  permanent condition was relatively straightforward, according to the Arup-Atkins engineers who led the design team. It was based on previous geotechnical ground investigations. The structure was modelled using Oasys GSA 2D quad elements, typically 1m x 1m to predict displacement.

A major consideration was the possibility of loss of water from the docks: given a combination of failure of the gates and a very low tide, the weight of remaining water would not provide sufficient dead weight. So existing Victorian brickwork was brought into the model as an integral design component to resist predicted uplift. Conversely, the design also allows for the extra weight that would be imposed should a vessel sink in the passage above.

How Oasys proved invaluable

It was the construction phases of the project presented more taxing problems.

First the side walls were cast to fit the existing brickwork and cast steel profile. Next came the roof section, followed by the invert (floor) and then the lower side walls. Particular attention was paid to the length and sequence of the invert bays or sections, including the ability of the new structure to span the temporary voids that would be created by the excavation of the original Victorian invert brickwork.

Oasys GSA output showing stress distribution for re-profiled invert (in this case, stresses exceed safe working stress of brickwork.

As a result, the invert replacement called for flexibility and fast reiteration of the 3D finite  element model that had been created in Oasys GSA. The engineers were able to determine the impact of variations in the actual lengths of original invert bays as they were excavated and, as a result, lengths were increased from the original assumption of 4.0m to 4.3m, with two central 5.0m bays. This meant that fewer bays were required and generated savings in time and cost.

During the construction phase, further GSA modelling supported, among other aspects of the project, an open air phase when the dock passage was closed and drained so that work could be carried out more-speedily and economically in the open from above. Construction staging was also made easier because Oasys GSA could investigate the feasibility of constructing some invert bays after re-flooding of the dock passage,

A full report of the rehabilitation of the Connaught Tunnel can be read in The Structural Engineer, August 2016.

Connaught Tunnel - Credit adeadendstreet.co.uk

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