Damage limitation

This article describes the system of shock transmission units, or buffers, being employed on the new Stonecutters Bridge in Hong Kong. In normal load conditions, the units provide a very stiff connection between deck and pylons. A hydraulic circuit connecting all the units enables them to act simultaneously in seismic activity, wind action or traffic braking loads. The system is also designed to minimise the slower reaction from deck thermal expansion. Four units are installed per pylon. The circuit is designed to withstand temperature-activated changes in the volume of the hydraulic fluid by the use of accumulators with nitrogen-filled bags which expand or contract as necessary to maintain pressure. During slow movements, a control valve allows the oil to move at high pressure within the unit, but in fast or dynamic movements the oil is prevented from flowing quickly, allowing the buffers to lock. Potential pipe damage is controlled by check valves. Tests are to be carried out to measure compressibility of the hydraulic fluid, the effect of pressure on the piping system, the resistance of the system to thermal displacement, and maximum reaction at high velocities. Lateral bearings which only transmit compression forces control transverse movements of the bridge girders.

  • Availability:
  • Authors:
    • COLATO, G
    • Infanti, S
  • Publication Date: 2006


  • English

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Filing Info

  • Accession Number: 01051124
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Jun 11 2007 1:27PM