CONCRETE BOX DECK JACK-KNIFES IN AUSTRIA

This article reports on the collapse of part of the cantilevered deck and steel erection gantry on the Gmund viaduct in Austria. Mention is made that, at the time of failure, attempts were bing made to shift the steel main beam sideways to cope with the viaduct's curvature and that the cantilevered arm of the concrete deck had been subjected to the heaviest loads in the erection sequence just 3 hours previously. The collapse, possibly due to compression failure, occurred when the nose of the gantry had been landed on the next pier, but failure of the gantry's support at the end of the concrete deck caused the nose to drag off the pier. This method of construction has been widely used but this particular Austrian system appears to be somewhat lighter in form than is usual. The work prior to the collapse is described together with reports by people who were present during the collapse. It is stated that engineers on site believe that the gantry was not to blame as cubes tests throughout construction had all been satisfactory. Two inquiries were immediately started. Meanwhile work is being done to save all the piers and the first three spans, although engineers are not yet sure how to dismantle the hanging cantilever and the adjacent span. /TRRL/

Media Info

  • Features: Figures; Photos;
  • Pagination: p. 8-9
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00127907
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Dec 29 1975 12:00AM