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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.

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Superseded Versions of Terms and Conditions

Oasys keeps copies of all superseded versions of its terms and conditions.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

“The Future of Us” – Resolving gridshell buckling risks

Software Used on this Project

Project Overview

Singapore’s ‘Future of Us’ exhibition captured the imagination of the public and inspired more than 400,000 individuals to record their hopes, dreams and promises.

The exhibition was spread across four domes linked by a large-span shell structure, engineered by Singaporean firm Passage Projects. Passage Projects worked closely with Architects at the Singapore University of Technology and Design Advanced Architecture Laboratory to design the gridshell’s metal lattice structure to generate a stunning play of light and shade cast by the lattice –  creating the illusion of walking through a forest. The engineers were faced with challenges due to the complexity of the design but were able to resolve the challenges using Oasys GSA analysis.

Structure overview

The steel structure, spanning approximately 50m and rising to 16m, supports 11,000 perforated aluminium panels. The structure consists of primary arches and a secondary bracing structure. Most of the connections are bolted, allowing for a fast construction cycle of just under 5 weeks.

How Oasys proved invaluable

Structural modelling

The global analysis of the steel structure was carried out using Oasys GSA. The structure was first modelled on Rhino and imported into the GSA software seamlessly using the AutoCAD DWG/DSF import tool. View the analysis model in GSA plan view in the image slider above.

Instabilities investigations

A modal buckling analysis was carried out under ULS loadings. In some locations, arch buckling modes were found to have a buckling factor smaller than 3. The arches at these locations are very flat and are subject to high compression forces. The GSA analysis helped to identify the arches requiring additional stiffness. It was decided to stiffen these flat areas of the gridshell by fixing all the primary purlins to the affected arches. This increased the buckling factor from 3 to 8.

Buckling of flat arches with a buckling factor smaller than 3

Plan view of the analysis model – All primary purlins are pinned to the arches, except at the flat area where they are fixed

Instabilities and Geometrical imperfections.

Three global buckling modes remained with a buckling factor lower than 10. To resolve this issue, a geometrically non-linear elastic analysis was done. Global imperfections were included in the model and local imperfections taken into account through members checks.

Engineers were able easily to include these global imperfections in their calculations because GSA has built-in tools to create a new model from deformed geometry. This used the deformed shape of the first global buckling mode, with the maximum amplitude of the global imperfection limited to 30mm. A non-linear analysis was then carried out on this new model and the results used to check the structural members.

Buckling mode – buckling of arches

 

Axial force – ULS Moment – ULS

Credits

The Future of Us exhibition, Singapore

Engineers: Passage Projects / Sh Ng

Architects: Advance Architecture Laboratory, SUTD

“The project reinvents the experience of a tropical space by providing a comfortable, unique, multi-sensorial and climatically appropriate experience to be enjoyed by everyone.”
ArchDaily

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