IN-SITU STRESS TESTS - FINDING THE DEAD LOAD STRESSES IN METAL BRIDGES

In-situ stress in metal bridges can be determined by measuring the strains generated when the stress is relieved by mechanical means. This paper describes a method of achieving this whilst imposing virtually no damage to the structure. The method involves placing an array of gauges in a fixed geometrical pattern on the surface of the metal and measuring the relaxation of stresses as a small hole is drilled within the pattern. The procedure is described. The use of an ultra high speed drill induces very little additional stress. An analysis of the results using the ASTM method provides a stress profile in the depth of the hole drilled. Drawbacks and difficulties which may arise are discussed. Of particular importance is identifying the influence of manufacturing stresses. For the covering abstract see IRRD 864951.

  • Corporate Authors:

    SURVEYOR

    32 VAUXHALL BRIDGE ROAD
    LONDON,   United Kingdom  SW1V 2SS
  • Authors:
    • Moore, D R
  • Publication Date: 1994

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00668040
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Nov 2 1994 12:00AM