VIBRATIONS OF CURVED SPANS FOR MASS TRANSIT

Nondimensional dynamic responses of simple and multiple-supported, horizontally curved beams with moving loads are measured in laboratory-scale experiments. Effects of system parameters involving span stiffness, arc length, frequency, end support constraints, and various transit load speeds and spacings are investigated. For critical combinations of certain parameters, adverse coupling of bending and torsional span responses are observed. For instance, as critical load speeds are approached, measured twist angles and bending strains at midspan approach unboundedness for multiple spans, but are bounded for equivalent simple spans placed end-to-end. Calculations based on Bernoulli-Euler curved beam theory (with negligible warping rigidity) complement these simple span measurements. Experiments also include multiple spans with up to 90 degree turns, subject to both transit point loads in tandem and sprung vehicles. Results are applicable to dynamic span designs for mass transit systems.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/07339399
• Corporate Authors:

  American Society of Civil Engineers

  345 East 47th Street
  New York, NY  United States  10017-2398
• Authors:
  • JOSEPH, T P
  • Wilson, J F
• Publication Date: 1980-4

Media Info

• Features: References;
• Pagination: p. 255-272
• Serial:
  • Journal of Engineering Mechanics
  • Volume: 106
  • Issue Number: 2
  • Publisher: American Society of Civil Engineers
  • ISSN: 0733-9399
  • EISSN: 1943-7889
  • Serial URL: http://ascelibrary.org/journal/jenmdt

Subject/Index Terms

• TRT Terms: Beams; Bridge design; Bridges; Critical velocity; Curved bridges; Dynamic loads; Elevated structures; Geometric curves; Girder bridges; Laboratory tests; Mathematical models; Motor vehicles; Public transit; Railroad bridges; Rapid transit; Scale models; Speed; Structural design; Traffic speed; Vibration
• Uncontrolled Terms: Dynamic response
• Old TRIS Terms: Beams and girders; Critical speed; Curved; Curved girder bridges; Curved spans; Rapid transit railroads
• Subject Areas: Bridges and other structures; Construction; Highways; Public Transportation;

Filing Info

• Accession Number: 00312426
• Record Type: Publication
• Source Agency: Engineering Index
• Files: TRIS
• Created Date: Aug 5 1982 12:00AM