This article briefly describes the design and construction of a new harbour bridge in Nagasaki, Japan, and details the use of special rubber dampers to help the bridge withstand high winds. A cable-stayed bridge design was chosen with orthotropic box section deck. It was designed for an average wind speed of 49m/s and a maximum of 75m/s. Tuned mass dampers are installed in the top of each tower to mitigate wind-induced vibrations. A high-performance cable damping system is used. A specially altered rubber is made into small circular pads which are sandwiched between upper and lower steel plates attached to the bottom of the stay-cable sheathing by flanged collars. The number of pads required varies from two to six depending on cable diameter, length, tension, weight and position of installation. The dampers are seen as very durable and maintenance-free, and are effective at reducing both high and low frequency vibrations.

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    Hemming Information Services

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  • Publication Date: 2004


  • English

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  • Accession Number: 00988532
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Apr 4 2005 12:00AM