AMBIENT VIBRATION OF TWO SUSPENSION BRIDGES

THE DYNAMIC CHARACTERISTICS (I.E., NORMAL MODE NATURAL FREQUENCIES, DAMPING, AND SHAPES) OF TWO SUSPENSION BRIDGES ARE ESTIMATED FROM EXPERIMENTALLY MEASURED AMBIENT MOTION TIME HISTORIES. THESE CHARACTERISTICS WERE ESTIMATED USING RANDOM VIBRATION THEORY AND THE POWER SPECTRAL DENSITIES OF AMBIENT TIME HISTORIES. TWENTY NORMAL MODES OF VIBRATION WERE OBSERVED IN A FREQUENCY RANGE OF 0--60 CPM FOR THE NEWPORT BRIDGE IN RHODE ISLAND. THESE MODES INCLUDE NINE VERTICA , SIX LATERAL, AND TWO TORSIONAL DECK MODES PLUS THREE LONGITUDINAL TOWER MODES. FOR EACH MODE ESTIMATES ARE OBTAINED OF NATURAL FREQUENCY OF VIBRATION, DAMPING, AND SHAPE. FOR THE OTHER SUSPENSION BRIDGE, THE WILLIAM PRESTON LANE MEMORIAL BRIDGE, 13 NORMAL MODES OF VIBRATION WERE OBSERVED. THESE MODES ARE SIX VERTICAL, SIX LATERAL, AND ONE TORSIONAL DECK MODE. NO TOWER MODES WERE OBSERVED IN THE 3--60 CPM FREQUENCY RANGE. /ASCE/

• Supplemental Notes:
  • Vol 97, No ST10, PROC PAPER 8454, PP 2567-2582, 14FIG,
• Authors:
  • Mclamore, V R
  • Hart, G C
  • Stubbs, I R
• Publication Date: 0

Media Info

• Serial:
  • Journal of the Structural Division
  • Volume: 99
  • Issue Number: st7
  • Publisher: American Society of Civil Engineers

Subject/Index Terms

• TRT Terms: Damping (Physics); Dynamic loads; Environment; History; Natural frequency; Power spectra; Seismometers; Shape; Spectrum analysis; Suspension bridges; Vibration
• Uncontrolled Terms: Dynamic response
• Subject Areas: Bridges and other structures; Highways; History;

Filing Info

• Accession Number: 00209563
• Record Type: Publication
• Report/Paper Numbers: Proc Paper
• Files: TRIS
• Created Date: Dec 20 1971 12:00AM