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Terms & Conditions

Contents

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Privacy and Cookies

Data Security

Website Terms and Conditions

Software Licensing Terms


Privacy and Cookies

We may change this privacy notice from time to time by updating this page.

What information do we collect?

When you use this website, we may collect the following information:

  • the areas of the website that you visit
  • information about your computer, such as which browser you are using, your network location, the type of connection you are using (e.g. broadband, ADSL etc) and your IP address

We do this by using cookies, which are small files that help us track how our visitors use the website and enable us to understand where we can improve your experience. If you would like to find out which cookies we use and the information they track see our Cookies Policy.

Once you submit or register information through our website we will know who you are and your activities on this website and information about you and/or your company may be recorded on our systems. For example, we may ask for personal information when you download our software including:

  • your name
  • company name
  • email address
  • postal address
  • telephone number
  • country where you are based
  • Social media ID
  • your comments/questions
  • services/markets you are interested in

We may also collect personal information from telephone calls and/or other correspondence with you.

What do we do with the information we collect?

The information we capture is used for various purposes. The main purpose is to provide you with our services (whether available via the website or offline). We also use the information for:

  • website development
  • understanding how our visitors interact on the website
  • understanding what our clients are interested in
  • understanding what potential clients are interested in
  • dealing with enquiries/concerns
  • marketing our services and people to you
  • market research
  • service development
  • internal record keeping

Marketing

We would like to provide you with information about our services and other information which we think you may find interesting. We may send you such information by post, email and/or telephone, unless you have asked us not to do so.

We will not provide your personal information to other organisations for marketing purposes without your explicit consent.

If at any time you do not want your information used for direct marketing purposes, please contact us or follow the unsubscribe link in our marketing email messages.

Who do we share this information with?

We may share your personal information with companies acting on our behalf who will only use the information to provide that service. However, we will retain control of your data and any third party service provider that we use must act in accordance with our instructions. We may also share your personal information with a purchaser or potential purchaser of our business.

In some circumstances, we may have to disclose your personal information by law, because a court or the police or other law enforcement agency has asked us for it.

How to get copies of or amend the information we have collected

You may request details of the personal information that we hold about you under data protection laws. If you would like a copy of the information held about you please write to us at oasys@arup.com or at: Data Protection Officer, 13 Fitzroy Street, London, UK, W1T 4BQ. Please note that we may charge a small £10 administration fee for information requests.

If you think any information we have about you is incorrect or incomplete, please email us as soon as possible. We will correct or update any information as soon as we can.

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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, including locked cabinets, electronic password protection and pass card access to buildings.

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.

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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

Twelve months support and maintenance is included with most products. Thereafter maintenance is typically 20% of the current sales price.

An annual maintenance service is available for most programs after the first year.

This service includes:

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

Optimisation of High-Rise Structures

Software Used on this Project

Project Overview

In order to optimise the freeform truss façade of their high-rise structure in the early stages of the design process, Bas Wijnbeld at the Eindhoven University of Technology, working with the Arup Amsterdam office, knew that they could combine their creative programming skills with the power and flexibility of GSA to achieve the desired result. Their optimisation tool, which makes extensive use of the COM interface possibilities of GSA, has two principle functions. The first is to generate a single structure based on user-defined parameters. It then finds the minimum section sizes that satisfy the strength and stiffness requirements. The second principle function is to use artificial intelligence techniques to determine the optimal structure.

The basic inputs of the optimiser program are:

  1. The boundary of each floor. This determines the shape of the building
  2. Initial section sizes
  3. Dead, live and wind loads

How Oasys proved invaluable

How does it work?

The optimisation tool was developed using just Visual Studio and the GSA COM-interface. GSA’s role was both visualisation and analysing the generated structural models, supplying the results back to the optimiser program.

Generating the Geometry

First the optimiser program reads node and element data from the initial GSA model and uses this information to recognise floor edges. As this optimiser program is especially developed for freeform continuous smooth surfaces it doesn’t recognise corners; an optional subdivision algorithm can be used to increase smoothness of the floor perimeters.

The next stage is to decide the locations of the floor connections, resulting in elements being created between these nodes.

Creating a Complete Calculation Model

As a calculation model needs more than the geometry alone; the section properties, con

straints, releases, loads and load combinations are also generated. In this example there are a total of 30 load combinations: 9 SLS combinations and 21 ULS combinations.

Just like the node and element data, all this information is easily exported by using the GwaCommand function of the COM-interface.

Steps generating a model

Optimising Section Sizes

The minimal needed section sizes are automatically determined from both the strength and stiffness constraints. This process is split in two steps: first the minimal needed section sizes based on strength are determined (Eurocode check). This is a simple process, where the section sizes are iteratively changed based on the forces in that element: the model is calculated in GSA and the forces acting on each element are exporting to our program which determines the minimal needed section size. As changing the section size changes both the self weights and stiffnesses, hence force distribution, this process repeats until it converges on the overall lightest sections.

After the minimal section sizes are determined based on strength properties, the top and storey drift has to be limited to a maximum set by the user. To do this efficiently, a sensitivity analysis is performed: for every section group the effect of this section size on the deformations is considered. With this information and the steel weight of every section group (which the GSA can export using the COM), the most economic decision can be made.

Section distribution for different (non-optimised) models

Finding the Optimal Topology

Process of a Genetic Algorithm

The final task of the program is to find the optimal topology of the truss façade structure. Optimal is in this case defined as: minimal weight and minimal elements (nodes). Because the solution with the minimal weight generally isn’t the solution with the minimal elements, this results in a range of solutions which are optimal in a certain way; this range is known as the Pareto Front. The Pareto front is found by using the Harmony Search Algorithm (comparable to a Genetic Algorithm), with three populations (each with a different target) and containing 10 possible solutions each. In total around 1,000 possible solutions are generated and optimised in every single cycle.

This process would be virtually impossible without stability and robustness of GSA and especially its COM interface while conducting heavy computation.

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