 Non-linear analysis was also carried out to assess the response under various load cases and to analyse the serviceability requirements such as vibration.It was also important to carry out robustness studies in order to examine the behaviour that would arise if the structure were subjected to accidental or deliberate removal of a helix or supporting member.The Helix is fabricated from approximately 650 tonnes of Duplex Stainless Steel and 1000 tonnes of carbon steel used in the temporary structure and also helping the bridge to get the helix shape.