Terms & Conditions

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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 [email protected] 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Superseded Versions of Terms and Conditions

Oasys keeps copies of all superseded versions of its terms and conditions.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

Alp FAQ

Alp – How might I avoid ‘Incremental deflection > limit at iteration %d’ errors during analysis?

Analysis may fail at a particular limit of lateral load with the message “Incremental deflection > limit at iteration %d”.

The incremental deflection limit is set in ALP under “Convergence Control”. This is a reasonably large number by default (2m), so if you are exceeding it there may be a problem with the design. Unless you have the wrong soil/pile stiffnesses entered, excessive displacement probably indicates the soil has gone fully passive and still not reached equilibrium.

It can sometimes also help Alp to converge if you apply your load in increments, rather than all at once. This allows you to look at the pile and adjacent soil behaviour with increasing lateral load. From the tabular output, you should be able to observe at what loading the soil passive resistance limit is reached and the soil goes plastic.

ALP assumes a linear elastic behaviour for the pile, so no structural failure is modelled. You will have to do a structural check separately.

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