ANALYSIS AND EVALUATION OF BRIDGE BEHAVIOR UNDER STATIC LOAD TESTING LEADING TO BETTER DESIGN AND JUDGMENT CRITERIA

Load testing offers an effective means of investigating the actual behavior of a bridge and detecting a possible abnormal response. A computerized data base of the results of over 200 load tests performed in Switzerland was established to study the behavior of bridges subjected to a load test. This large number of bridges enabled the Institute of Reinforced and Prestressed Concrete of the Swiss Federal Institute of Technology in Lausanne to carry out a comparative statistical study to better understand the behavior of different types of bridges. The main evaluation criteria are the agreement between the measured and calculated deflections and the similarity between the measured and calculated deflected shapes. Although the deflections under loading can be measured precisely, their calculations are difficult because of phenomena usually not taken into account in the design. Statistical analysis of the data base, combined with an analysis of 88 bridges, led to recognition of the contribution to the overall stiffness of nonstructural elements such as reinforced-concrete parapets, asphalt wearing surfaces, and reinforcement. The precise determination of the modulus of elasticity of concrete led to the use of ultrasonic measurements, drilled cores, and molded samples of concrete. The analysis confirmed the correlation between unsatisfactory short-term behavior during the load test and abnormal long-term behavior. Bridges with a low level of prestressing often exhibit unsatisfactory behavior, whereas a higher prestressing level seems to prevent abnormal bridge behavior.

Language

  • English

Media Info

  • Features: Figures; Photos; References;
  • Pagination: p. 296-303
  • Monograph Title: FOURTH INTERNATIONAL BRIDGE ENGINEERING CONFERENCE, SAN FRANCISCO, CALIFORNIA, AUGUST 28-30, 1995. CONFERENCE PROCEEDINGS, 2 VOLUMES
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00711698
  • Record Type: Publication
  • ISBN: 0309061091
  • Files: TRIS, TRB
  • Created Date: Sep 5 1995 12:00AM