In bridge superstructures, floor trusses are often used as primary load-carrying members. Load is typically transferred to the floor truss from the concrete deck through the stringers. Plate girders or tied arches support the floor truss. Bridge designers make several assumptions about structural behavior of floor trusses in bridge superstructures to simplify the design process. This paper analyzes the validity of some of these assumptions using field measurements. The measurements were taken on three floor trusses in a tied-arch span over the Mobile River on Interstate 65 in Alabama. Floor trusses were instrumented with strain gauges and strain was documented as test trucks of known weight stopped over the floor trusses or were driven across the span. These static and dynamic tests were followed by random tests in which trucks in normal traffic flow crossed the span. Results from a simple planar computer model of a floor truss were compared to the field measurements. The assumptions were found to be conservative and reasonable with the exception of one.


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  • Accession Number: 00721975
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 11 1996 12:00AM