In studies of the damping behaviour of bridges one of the most important experimental aspects is the method of excitation. Methods reviewed include use of a vehicle driven across a plank, release of deflection, pulse loading by rockets, rotating massess, reciprocating weights, people jumping or pulling ropes, and analysis of wind induced movements. Measurements in the laboratory have shown that the values of intrinsic material damping range from logarithmic decrements of 0.002 to 0.009 for steel and 0.01 to 0.06 for concrete. Values for beams are 0.004 to 0.030 for steel and 0.02 to 0.06 for concrete. In all cases it was found that damping increases with amplitude of vibration by factors of up to 4 to 1. Measurements on bridges including recent work by the Laboratory reported in a companion paper, gave damping values of 0.02 to 0.06 for steel, 0.05 to 0.10 for composite and 0.02 to 0.10 for concrete bridges. /Author/

Media Info

  • Features: References; Tables;
  • Pagination: p. 1-9

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Filing Info

  • Accession Number: 00172166
  • Record Type: Publication
  • Report/Paper Numbers: TRRL Rpt. 275 Proceeding
  • Files: TRIS
  • Created Date: Apr 12 1978 12:00AM