The objective of this study was to experimentally evaluate the statistics of dynamically induced stress levels in steel through-truss bridges as a function of the bridge component type, component peak static stress, vehicle type, and vehicle speed. Three 60 year old steel through-truss bridges with similar characteristics were investigated. Several bridge components on each of the three bridges were instrumented, and dynamic strain data were collected under controlled and normal traffic conditions. The dynamic strain histories were processed to obtain bridge component peak static response and peak dynamic response, resulting in the determination of the dynamic load allowance for each of the instrumented bridge components for each of several truck crossings. The calculated DLA value was plotted as a function of member peak static stress for each bridge member instrumented. The DLA data were examined as a function of component type, component location, truck type, number of axles, truck speed, and truck direction.


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  • Accession Number: 00778706
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Nov 21 1999 12:00AM