Bridges subjected to dynamic testing have commonly shown relatively small variation of damping (expressed as the effective instantaneous logarithmic decrement) with amplitude. This is clearly closer to the theoretical solution for viscous or idealised hysteretic damping than to the solution of the classic simple friction-damped system. Nevertherless, the magnitude of the observed damping is such that in many cases friction must make a major contribution to the dissipation of the energy of oscillation. Some indication is given of the possible magnitude of hysteretic effects, including cases where an apparently hysteretic behaviour arises although the actual dissipative mechanism is frictional. To assist understanding of the way practical factors modify the classic friction damping model, the results are presented of an extended analysis of the effect of friction in more complex system. /Author/

Media Info

  • Features: Figures; References;
  • Pagination: p. 10-21

Subject/Index Terms

Filing Info

  • Accession Number: 00172167
  • Record Type: Publication
  • Report/Paper Numbers: TRRL Rpt. 275 Proceeding
  • Files: TRIS
  • Created Date: Apr 12 1978 12:00AM