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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


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

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

Block D24 development, Songdo, Korea

Software Used on this Project

Project Overview

Songdo International Business District is on 1,500 acres (6 km²) of reclaimed land along Incheon’s waterfront, 40 miles (65 km) west of Seoul, South Korea. The Songdo Block D24 development, also known as Central Park III, is a group of residential towers. Architects Hok International Ltd and Arup designed a 52-storey tower using a patented structural system which puts together simple components to create the dramatic twisted tower in an economic and effective way. These towers consist of three primary components:

  • Two residential towers approximately 160m tall with 45 storeys above grade
  • 3-4 storey podium buildings housing retail
  • Two level basement over the whole site, approximately 280m x 70m

How Oasys proved invaluable

The innovative use of structural walls working as cantilevers removes columns from the building. This means each floor can be rotated without generating torsion loads that normally occur. 30m+ clear spans are available in every apartment with only a flat slab and edge beam due to wall supports alternating above the slab and below the slab.

The system has 3 main principles:

  • Cantilever partition walls – five apartment partition walls on each floor are used as structural cantilever walls built of reinforced concrete
  • Alternate floors – the position of the apartment partition walls alternates on every floor
  • Rotation – each floor is rotated slightly by the same amount above the previous floor

Cantilever Partition Walls

Partition walls are built using structural reinforced concrete. They act as floor depth cantilevers which transfer the weight of the floor back to the core wall. The full depth wall engages the slab above and below as flanges of an I-section to maximize the efficiency of the cantilever in bending.

The floor slabs, acting as the flanges of the cantilevers, resolve the cantilever bending forces with diaphragm action. These floor diaphragms essentially provide the back-span to the cantilevers, by tying them all together, balancing loads between the 5 cantilevers on each floor.

Alternate Floors

On plan, the five partition walls divide the floor into segments each with a perimeter length of approximately 26m to 30m. This is too long for a slab /beam span so the walls on alternate floors are offset to divide this span into two. Each cantilever supports two floors, one on top and one hung below. The edge beam is supported alternately from above and below as it traces around the perimeter of the floor. For repetition, each pair of floors are alike.

The alternating floors also allow the elimination of lintel beams in the main core wall. Since the apartment layouts on successive floors are offset, their main entrance doors, which pass through the main core wall, are not vertically aligned. Traditional lintel beams in tall buildings greatly reduce the stiffness and efficiency of the core wall and are slow and difficult to build. The staggered arrangement of openings means that all lintels are over one floor height deep. This makes the core much stiffer and the lintels are constructed in the same simple manor as walls are built.


Because gravity load is transferred back to the core at each level without the use of columns, each floor is free to be rotated above the previous floor without creating lateral or twisting forces. It is this freedom that allows the twisted architectural form of the building to be created.

Analysis and Design

Tower Gravity Analysis

A 2-dimensional shell element model was used to analyse the gravity system. The model consisted of only the unique top floors, unique bottom floors and eight typical floors of the structure. Spreadsheets were used for the full load run-downs to minimise the complexity of the GSA model, reducing it down to what was relevant and essential.

The design took into account all the in-plane and out-of-plane forces imposed on the GSA shell elements, as well as the differential axial shortening.


The towers were designed using GSA to satisfy the Korean Building Code using both the Response Spectrum Method and checked using an LS-DYNA non-linear time-history analysis.


The GSA analysis included a check on the vibrations that could possibly be caused by people walking around on the slab. It was found that the maximum response came between two and three, which was comfortably below the target R value of four, even ignoring the additional damping and restraining effects of the full height partitions.

Piled Raft Foundation

Following a separate analysis to determine the pile stiffnesses, the base piled raft was analysed as a sub-model. To save modelling the core, a ring of nodes on the core centreline were constrained back to a central node just above the mesh. All stability loads were then applied to this central node, which distributed them to the core wall locations on the slab.


The towers use the same volume of concrete as normal rectangular towers and creates large column-free apartments with clear spans of up to 32m, and use less than half the volume of concrete of comparable buildings. The design supports the client’s desire for interesting architecture while minimising the embodied energy used in the materials to construct it.

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