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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Superseded Versions of Terms and Conditions

Oasys keeps copies of all superseded versions of its terms and conditions.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

Bamboo Bridge

Software Used on this Project

Project Overview

Infranatural invited Bruce Danziger (Arup) to design a bamboo bridge for the Here there be monsters installation at the Materials and Applications research centre, Los Angeles. With the help of Moritz Freund, Shuchi Hsu and Mecky Reuss the bridge developed into a curved and partially cut-away tube functioning as the primary stage from which visitors can interact with the water and its creatures.

Bruce Danziger details the design and analyses process:

“When I was invited to design a bamboo bridge to span over a fountain designed by others, I asked a former student, Shu-Chi Hsu and her friend Moritz Freund (young architects from Taiwan and Germany) to join me in designing the bridge setting up a relationship that is non-hierarchical in that I am not the leader and we share responsibility, decision making and hard work. We decided to call ourselves workshop: LEVITAS. Mecky Reuss, another young German architect, also joined our group”.

How Oasys proved invaluable

Taking as a starting point, the bending moment diagram of a propped cantilever, I made some sketches in Rhino. Working with the fountain designers, we designed the bridge to become a platform or stage area to view the fountain.

We transferred the geometry from Rhino to GSA retaining separate layers for different elements. It is a wonderful feature of GSA that the dxf file retains its separate layering when imported to GSA with the property card holding the layer names and the elements having the corresponding group and property numbers.

The first analysis runs showed high stress levels adjacent to the supports. The support conditions and physical assumptions for these support details needed modification – easily achieved using the sculpt command.

We quickly went through several iterations of the geometry in Rhino and transferring back to a “Skeleton” of a model in GSA. What I mean by “Skeleton” of a model, is not a skeletal model, but a process I use quite often with GSA that goes like this:

  • Import dxf model with nodes, property names and numbers, element connectivity
  • Create actual section properties using the wizard
  • Create any special material properties (bamboo in this case)
  • Create basic loadcase names
  • Input loads based upon property numbers and/or group numbers

Using the shell of a model, the nodes can be deleted or copied over from a separately imported DXF file or spreadsheet. The elements can also be deleted and replaced with a copy of another imported DXF file. So the “Skeleton” of a model is everything minus some or all of the topology (node and elements).

We had to revise the support conditions to avoid locked-in stresses. The break-through was the flexible support detailing reflected in the analysis model to allow the structure to deform uniformly without concentrating stresses at the bamboo elements adjacent to the supports.

The temporary nature of the water installation prompted a raw, low-tech design approach to the bamboo bridge. Every piece of bamboo used was freshly-cut, green and untreated, allowing for natural wear and decay over the lifetime of the bridge. To further simplify the process, cable zip ties were selected as the primary connective material, as opposed to traditional rope ties. Unlike the conventional design/construction process, the shape of the bridge adapts to the nature of the bamboo and is liberated from the templates built by the computer. During its lifetime the woven bridge will remain in a state of flux, in both form and colour due to the inherent natural drying process of bamboo and its exposure to environmental forces.

“I think it turned out much better than the computer simulated model would have led us to imagine.” Bruce went on to to say. “Although the bridge embodies the essence of the structural diagram, and the shape we created digitally, its expression of form and character in both materials and construction takes on another quality. It’s very exciting for us that the physical bridge is NOT an exact representation of the computer model (unlike most contemporary architecture, which tends to be). The bridge takes on the nature of bamboo, thus freeing itself from the computer model.”

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