UP-LOADING : MEASUREMENTS AND DATA ON BRIDGE PERFORMANCE OUT IN THE FIELD PROVE TO BE INVALUABLE

This article explains field measurement techniques for determining the remaining life cycle of a bridge. The author begins by listing some of the major metrics that can be measured on an old bridge, such as load distribution, support conditions, and stress fields in connections. The result is an accurate look at remaining fatigue life of steel bridges, evaluating steel bridges with fatigue cracks, bridge load ratings and structural problem diagnosis. The author looks at the methods for determining the range of cyclic stresses caused by the live load, mostly using strain gauges. Modeling prior to field measuring is recommended in order to achieve an accurate idea of the location of most of the fatigue critical members. The author makes an example of fatigue testing at the Cleveland Central Viaduct spanning the Cuyahoga River. A discussion follows on fatigue cracks and how to analyze their severity. Testing of the Norfolk Southern Railroad Bridge over U.S. Route 50 in Maryland is used as an example of how to ascertain the probable severity and reparability of fatigue cracks. Lastly, the author questions the assumptions of conventional structural analysis where conservative estimates of bridge life cause unnecessary posting, detouring, repair or replacement. The author advocates for better modeling and in-field testing over conventional structural analysis.

  • Availability:
  • Corporate Authors:

    Scranton Gillette Communications

    380 E Northwest Highway, Suite 200
    Des Planes, IL  United States  60016-2282
  • Authors:
    • Zhou, Y E
  • Publication Date: 2005-2

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00988228
  • Record Type: Publication
  • Source Agency: UC Berkeley Transportation Library
  • Files: BTRIS, TRIS
  • Created Date: Apr 1 2005 12:00AM