WIND TUNNEL testing of a 3m high, 1:100 scale model of the record breaking single leg tower design for Hong Kong's controversial Stonecutters Bridge project is about to start in Denmark.
A redesign of the towers to resist increased wind loads from an alternative type of stay cable means that more accurate results are needed to supplement the smaller scale testing already carried out at the Danish Maritime Institute's Copenhagen facility Designer Arup said that changes would allow contractors to be given the option to use site assembled parallel strand cables rather than the locked coil cables of the Flint & Neill/ Halcrow competition winning design. This is expected to give more competitive quotes.
Director Naeem Hussain explained: 'Locked coil cables are more difficult to install, and most contractors, apart from the Japanese, are much more familiar with parallel strand types.'
However, site assembled bundles sheathed in HDPE tubes have a greater diameter than the prefabricated alternative. Original design calculations are thought to have estimated that locked coil cables would have up to 35% less wind resistance, reducing the cost of both towers and foundations.