NEW APPROACHES TO BRIDGE DESIGN

The article describes recent advances in bridge design in Germany. The contact connection of precast prestressed units has enabled standardization to be made of precast units in a range of sizes, enabling the ordering of 'packaged' bridges. The force-locking contact connection eliminates in-situ concreting and also allows the design of demountable structures. The Brudermuhl bridge in Munich, erected in eight days to relieve traffic congestion, is described. The 190M long bridge used units of up to 30M in length, having stepped ends which provided the bearings. In the absence of in-situ concreting, the tendons are protected with epoxy resin in place of the usual grout. The structure is supported on square precast columns placed in socket foundations cast in the ground. Waterproofing is with mastic asphalt overlaid by a bituminous wearing carpet. A patent carriageway expansion joint consisting of a hollow neoprene filter gripped between epoxy nosings is described in detail. The other major development is the prestressed concrete cantilever. This system was used in a bridge over the river main connecting two halves of a factory in Frankfurt. Because of site and navigation constraints, the construction depth was limited to 2.6M in a structure having a clear span of 148m, and limitations on the length of the landward portion meant that a cable-stayed girder could not be long enough to complete the river span. The gap was made up by a balanced pre-stressed cantilever from the opposite bank. /TRRL/

  • Corporate Authors:

    Leyden Publishing Company, Limited

    5-7 Carnaby Street
    London W1A 4XT,   England 
  • Publication Date: 1973-1-2

Media Info

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Filing Info

  • Accession Number: 00260705
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Nov 6 1974 12:00AM