STRESS DISTRIBUTION IN BRIDGE FRAMES-FLOORBEAM HANGERS

The floorbeam hanger research project was an investigation of the causes and remedies for the failures in floorbeam hangers in railway bridges. The report is in four parts. A summary of the information submitted by various railroads concerning failures in floorbeam hangers of riveted truss spans and pin-connected truss spans was presented. It gave the results of a detailed stress analysis and classified the failures according to location. A summary of the results of exploratory laboratory tests made in an attempt to explain the failures was presented. It offered a hypothesis for causes and remedies of the failures and listed some of the unsolved problems. One field investigation made demonstrated the feasibility of reducing the stress concentrations at the copes of existing pin-connected hangers. The existing cope was filed to permit the installation of strain gages. Measurements taken indicated stress concentrations when the locomotive was placed to produce maximum load in the hanger. The average measured unit stress on the gross area of the hanger represented a local stress concentration of 3.67 times the average. The cope was altered and then produced a marked reduction in local stress concentrations. Other field investigations were summarized.

• Corporate Authors:

  American Railway Engineering Association

  59 East Van Buren Street
  Chicago, IL  United States  60605
• Publication Date: 1950

Media Info

• Features: Figures; Photos; Tables;
• Pagination: p. 470-504
• Serial:
  • AREA BULLETIN
  • Volume: 51
  • Publisher: American Railway Engineering Association

Subject/Index Terms

• TRT Terms: Bridges; Stresses; Trusses
• Old TRIS Terms: Bridge stresses; Floorbeam hangers
• Subject Areas: Bridges and other structures; Railroads;

Filing Info

• Accession Number: 00052443
• Record Type: Publication
• Source Agency: Association of American Railroads
• Report/Paper Numbers: Proceeding
• Files: TRIS
• Created Date: Jul 15 1974 12:00AM