Fulton Awards 2007 - Winner Design Aspects

Project Motivation For The Mkomaas River Pedestrian Bridge

Médium:	article de revue
Langue(s):	anglais
Publié dans:	Concrete Beton, juillet 2007, n. 115
Page(s):	8-13
Abstrait:	Jeffares & Green was appointed by the KwaZulu-Natal Department of Transport to design a pedestrian bridge over the Mkomaas river in the Sisonke District Municipality, South Africa. As the client was experiencing problems with the resonant behaviour of cable supported pedestrian bridges, alternatives were investigated to provide a more stable walkway for a long-span bridge such as that required over the Mkomaas river. After considering various alternatives the consultant proposed a pre-stressed concrete ribbon type structure for this site. Typically pre-stressed concrete ribbon bridgesconsist of pre-cast concrete elements suspended from cables tensioned between abutments. These elements are then joined and stressed along the length of the bridge by tensioning a second set of cables placed in ducts through the elements. Compression stresses induced this way compensate for tensile stresses resulting from subsequent live loads. As far as can be ascertained, the construction methods used for the Mkomaas river pedestrian bridge is a first in Africa and the length of its clear span equals the worldrecord of 150 metres set by the Plovdiv footbridge over a ship canal in Bulgaria.

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