TEST RESULTS FROM THE CONESTOGO RIVER BRIDGE

The Conestogo River Bridge is a three span continuous steel plate girder structure with a concrete deck longitudinally prestressed for full composite action. The design live loading was an upper-bound representation of all observed truck loadings in Ontario, and a grid analysis was used instead of the usual live load distribution factors. A new load factor method was employed, and deflection and impact values provided by the AASHTO Specifications were abandoned in favour of a dynamic analysis, resulting in a very flexible structure with low natural frequencies. Other features include the use of high strength bolts as shear connectors, and slab test panels designed for membrane action with greatly reduced reinforcing steel percentages. On the basis of full scale load tests, the advisability of the regular use of these features on future bridges is determined. The testing program was conducted using two test vehicles, each of which could be loaded to 890 kN (200 kips). Static tests indicate good correlation between analytical and experimental strains, with load distribution significantly better than predicted by AASHTO Specifications. Dynamic tests indicate that this very flexible bridge, with a first mode frequency below the usual range of commercial vehicle frequencies, behaves as anticipated. The valuable information obtained from this project is incorporated in the new Ontario Highway Bridge Design Code. /Author/

Media Info

  • Media Type: Print
  • Features: Figures; Photos; References;
  • Pagination: pp 90-98
  • Monograph Title: Bridge Engineering. Volume 2
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00183784
  • Record Type: Publication
  • ISBN: 0309026970
  • Files: TRIS, TRB
  • Created Date: Dec 12 1978 12:00AM