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Severn Suspension BridgeThe main span is 987.5 metres with side spans of 305 metres. The main towers are 136 metres high and the bridge mainspan has a clearance of 47 metres to the river below.The aerodynamically shaped cross section of the bridge deck box sections exert a downward force in strong winds enabling the tension cables to resist it. If an upward force was created, only the bridge weight could resist the resulting force and this has led in the past to the build up of oscillation as with the famous Tacoma Narrows bridge disaster. Most of the suspension wires (or hangers) have dampers near the bottom to prevent the wind causing them to vibrate as with an Aeolian harp | View of the bridge from downstream on the south shore Blue lines indicate the supension cables and hangers General view across the bridge from the south shore Close up view of the suspension cables and hangers |
Structure information
Submitted by
Geoff Howard
Location
Aust Cliff to Beachley Peninsula, Avon (UK)
Build date
1961 - 1966
Date photo taken
April 2003
Designer
Freeman Fox & Partners and Mott, Hay and Anderson. Constructed by A.C.C. Bridge & Company with Cleveland Bridge & Engineering Co. Ltd.; Dorman, Long and Co. Ltd.; and John Howard & Company.
Materials used
Steel
Related URL
Brantacan site on Suspension Bridges
Categories
Bridge
