ENGINEERS IN northern Greece are to examine similarities between London's Millennium Bridge and designs for the 565m Metsovitikos road bridge (NCE 11 November) to ensure that it will not suffer from the same side to side sway.
As with the Millennium Bridge, the Arup-designed Metsovitikos bridge is a suspension structure with an inclined cable plane.
The main difference between the two is that the deck of the London footbridge straddles the main cables, while the Metsovitikos structure's deck is suspended from inclined hangers.
Consultant Brown & Root, which is agent for Greek client Egnatia Odos, is concerned the unusual geometry produces a 'virtual fulcrum' beneath the bridge and that the deck could be susceptible to excessive lateral and torsional movement.
Brown & Root director and general manager Peter Mason said the firm was seeking assurance from Arup engineers that the deck was stiff enough to resist lateral and torsional movement.
Arup project director for Metsovitikos Allen Paul said analysis of the bridge was ongoing as detail design was still under way.
But the bridge's orthotropic steel deck will be 'extremely stiff', said Paul. The structure has been subjected to extensive wind tunnel testing. Analysis to assess performance under eccentric loading and lateral movement exerted by sudden lane changes has also been carried out, he added.