LIVE LOAD SPECTRA FOR BRIDGE EVALUATION

Efficient evaluation of existing bridges requires the knowledge of the parameters of resistance and load. This paper deals with the development of a data base for load modeling using weigh-in-motion (WIM) technology. Presented are results of steel highway girder bridge testing using WIM and a strain data acquisition system. The ten girder, three simple span, two lane steel girder bridge is instrumented in the 33 ft 6 in. entry span for all data collection. The bridge is located in Monroe County south of Milan, Michigan, on US 23 which is a major route between Detroit, Michigan and Toledo, Ohio with no weigh station on the route. Vehicle weight statistics are collected simultaneously with strain data. Distribution functions are generated for gross vehicle weight and measured girder strains allowing an analysis and comparison of the theoretical stress spectra based on WIM data to the actual measured stress spectra experienced by the bridge girders. Information concerning girder response to heavy vehicle multiple presence is presented as well as lateral load distribution functions and live load fatigue spectra for the girders. From these statistics conclusions are drawn regarding stress histories of the girders as a function of time and position of the girder in the bridge structure, facilitating decisions with regard to strengthening.

• Corporate Authors:

  Iowa State University, Ames

  Department of Civil, Construction and Environmental Engineering
  Town Engineering Building
  Ames, IA  United States  50011-3232
• Authors:
  • LAMAN, J A
  • Nowak, A S
• Conference:
  • Symposium on Practical Solutions for Bridge Strengthening and Rehabilitation
  • Location: Des Moines, Iowa
  • Date: 1993-4-5 to 1993-4-6
• Publication Date: 1993

Language

• English

Media Info

• Features: Figures; References;
• Pagination: p. 13-22

Subject/Index Terms

• TRT Terms: Data collection; Fatigue (Mechanics); Girder bridges; Gross vehicle weight; Highway bridges; Live loads; Load transfer; Steel; Strain measurement; Stresses; Structural strengthening; Weigh in motion
• Uncontrolled Terms: Lateral loads
• Geographic Terms: Monroe County (Michigan)
• Subject Areas: Bridges and other structures; Design; Highways; Maintenance and Preservation; I24: Design of Bridges and Retaining Walls; I61: Equipment and Maintenance Methods;

Filing Info

• Accession Number: 00924206
• Record Type: Publication
• Files: TRIS
• Created Date: May 21 2002 12:00AM