PRESTRESSED MASONRY ARCHES - A NEW APPROACH

A new approach to prestressed masonry arches is presented, together with its application to the construction of two pedestrian footbridges at Tring, Hertfordshire, England. The theory of prestressing a masonry arch is discussed, and its application to the construction of prefabricated prestressed precambered beam/arches is outlined. With prestressing, the behaviour of an arch depends, not only on its geometrical form and thickness, but also on the prestress applied to it. For example, prestress can be used to locate the line of thrust within the middle third of the arch. The tendons in a prestressed masonry arch need to be located to allow for reverse bending in the arch. It is shown how to use prestressing as the basis for a new construction method, which was used to construct the two footbridges at Tring. These bridges were constructed vertically with a 90mm eccentricity; in this position, they remained in compression across the section during prestressing. The masonry beam/arches were built vertically, then lowered into position. One bridge was prestressed using Parafil, and the other using macalloy bars. The bridges are equipped with minimal instrumentation, mainly vibrating wire gauges, linked to a remote laboratory.

Language

  • English

Media Info

  • Features: References;
  • Pagination: p. 653-61

Subject/Index Terms

Filing Info

  • Accession Number: 00720006
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • ISBN: 0-7277-2048-1
  • Files: ITRD
  • Created Date: Apr 26 1996 12:00AM