DETERMINATION OF DYNAMIC FORCES IN BRIDGES. TESTS OF THE A1 SERIES. SINGLE TRACK BRIDGES WITH SOLID WEB MAIN GIRDERS AND UPPER TRACK

The dynamic forces were measured on 4 single track metal bridges of the solid web main girder type, span comprised between 5.60 and 29.90 m, under various test trains; each girder was situated directly under a rail. The measuring results were laid down in tables and diagrams established as a function of certain factors of which the influence should be separately studied. The increment of the dynamic forces as a function of the speed was rather obvious. However, certain locomotives showed increment peaks at the intermediate speeds. Contrary to this, the dynamic forces were decreased when the span was increased. It also became apparent that these forces were not proportional to the static stress. The effect produced by wheelflats under the wagons was also examined. The dynamic increment resulting from the passing of a wheelflat was produced at a moderate speed. The report only supplies the rough measuring results, pending the evaluation of the tests carried out on other types of bridges. Subsequently, the possibility of establishing a formula covering the various cases will be examined.

• Supplemental Notes:
  • Restrictions on the use of this document are contained in the explanatory material.
• Corporate Authors:

  International Union of Railways

  Office of Research and Experiments
  Utrecht,   Netherlands 
• Publication Date: 1961-10

Media Info

• Features: Appendices;
• Pagination: 16 p.

Subject/Index Terms

• TRT Terms: Axle load force; Bridge design; Bridges; Defects; Dynamic tests; Equipment tests; Girder bridges; Measuring instruments; Stresses; Structural design; Wheels
• Uncontrolled Terms: Dynamic analysis
• Old TRIS Terms: Axle loadings; Bridge stresses; Cooper ratings; Question d23; Test equipment; Wheel flat spots
• Subject Areas: Bridges and other structures; Railroads; Vehicles and Equipment;

Filing Info

• Accession Number: 00052832
• Record Type: Publication
• Source Agency: International Union of Railways
• Report/Paper Numbers: D23/RP 4/E Intrm. Rpt
• Files: TRIS
• Created Date: Jul 8 1994 12:00AM