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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 [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 desktop software are set out in the Oasys Software Licence and Support Agreement.

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Superseded Versions of Terms and Conditions

Oasys keeps copies of all superseded versions of its terms and conditions.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

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

Design and analysis of the Sea Shell Aquarium roof using Oasys GSA

Software Used on this Project

Project Overview

The Sea Shell Aquarium is the largest international standard aquarium located at Phu Quoc Island, Vietnam and is part of the extension of the Vinpearl Land, Vinwonder amusement park. In the shape of a sea turtle, it is a magnificent structure housing a range of ecosystems supporting diverse marine life forms. The aquarium contains 49 water tanks, including a 7-meter-deep shark tank, a giant 12-meter-deep tank and 47 other smaller tanks.  

Vingroup JSC appointed Arup to design this unique building and realise the complex geometry of the aquarium structure. Arup engineers adopted an innovative structural design approach and used a variety of digital design tools, including Oasys GSA, in the structural analysis and design of the long span steel roof. 

Challenges to the Team 

The steel roof of the seashell is approximately 120 meters wide and 110 meters in length, with a 66 meter internal clear span. One of the key challenges the team faced for the roof design was the manipulation and rationalisation of the roof geometry, which was originally only drawn by the architect. To help simplify the fabrication and installation of the structure steelwork and the façade system, Arup initially proposed to rationalise the form based on the geometry of a torus shape. Even with this simplification to the geometry, challenges remained as they had to work with a high complex long span structure fabricated in steel, which was not a common material used for application for this type of construction in the local market and still is not.

Model in GSA

Model in GSA

The constant refinement and optimisation of the structure along with the frequent adjustment of the geometry by the client and architect required several iterations of analysis. This meant that a digital workflow was required, making this one of the first projects for Arup Vietnam where this type of workflow was applied from the onset. This resulted in a steep learning curve for the team. In addition to these technical challenges, there was also the pressure of an especially tight timeline imposed by the client: only five months elapsed from the start of the concept design to the erection of the first steel on site.

How Oasys proved invaluable

Arup engineers used Oasys GSA to quickly and accurately analyse and design the steel roof of the aquarium, it helped to solve the model in a timely and resource-efficient manner. The software was an integral tool in the iterative overall design process – in addition to it’s technical capability, the clear and user-friendly interface, comprehensive abilities and flexibility of the result display graphics, allowed the designer to gain a deep insight into the behaviour of the structure.

3D model from Architect/ Seashell Roof – Planview

3D model from Architect/ Seashell Roof – Planview

The initial roof structure design was based on a series of warren trusses arranged radially and two rings of a circumferential transfer truss system, with the whole frame supported on top of concrete columns cantilevering form the floor below. This formed clear and efficient load paths, reflected in the GSA model.

As part of the digital workflow, from the outset of the Concept Design stage, a central model was created in the modelling software Rhinoceros. At this stage of the design most of the key parameters defining the shape of the roof, the overall form, the boundary of the roof and the number and layout of the supporting columns were unknown, and so they were treated as parameters that could be varied as the design progressed. At a more detailed level, the height of the trusses, the type of connections used, and the bracing layout were also parameters that were expected to be investigated. These parameters were defined and controlled in the model through the software plug-in Grasshopper, this created a parametric model of the roof.

Column layout parameters

The initial geometry was exported into GSA where engineers ran the analysis to confirm the validity of the concept. Tests were then run with different configurations of the roof to find which one would work most efficiently. In this iterative process, the testing of the different configurations with the help of GSA provided fast and accurate analysis of the model, allowing more options to be investigated, and design decisions to be made on a rational, quantitative basis. 

Initial GSA model test 

By the end of the investigation, some 20 different configurations of the roof structure had been tested. For each geometrical configuration, the GSA analysis model was automatically updated to reflect the changes in geometry and the layout of the members in the central model.

To export the model from Grasshopper to GSA, the engineers used the Geometry Gym and Ovabacus plugins, written using the GSA’s COM API. One of the Arup project managers, Kiet Tran, later said:

“Recently I tried the GH-GSA plug-in, in Grasshopper and think that it would be a better replacement of the plug-ins we used for the Sea Shell Aquarium roof since it provides more functions and is faster compared to the others.

As the design progressed, the engineers discovered that they could maximise the repeatability to modularisation, the ease of fabrication and simplify the panel layout of the cladding system by further rationalising the base shape from a patch of a torus to that of a sphere. This adjustment was found to have minimal impact to the architect’s original geometry. The digital design workflow from Grasshopper to GSA allowed the adjustment to be made in an effortless manner.

Alongside the roof model created in GSA, the concrete building was analysed using ETABS and SAFE. From there, the concrete building model was imported into GSA with the help of the plug-in Ovabacus, for global checking. All the geometry and structural data was then exported to Revit using Speckle and Rhynamo. 

Head to the Arup article to find out more about this project. 

Find out more about Oasys GSA’s capabilities here. 

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