FREE TORSIONAL VIBRATIONS OF SUSPENSION BRIDGES

A generalized theory of free torsional vibration for a wide class of suspension bridges with double lateral systems is developed, taking into account warping of the bridge deck cross section and the effect of torsional rigidity of the towers. The analysis is based on a linearized theory and on the use of the digital computer. A finite element approach is used to determine vibrational properties in torsion. Simplifying assumptions are made, and Hamilton's principle is used to derive the matrix equations of motion. The method is illustrated by numerical examples. The objective of the study is to clarify the torsional behavior of suspension bridges and to develop a method of determining a sufficient number of natural frequencies and mode shapes to enable an accurate practical analysis.

• Corporate Authors:

  American Society of Civil Engineers

  345 East 47th Street
  New York, NY  United States  10017-2398
• Authors:
  • Abdel-Ghaffar, A M
• Publication Date: 1979-4

Media Info

• Features: References;
• Pagination: p. 767-788
• Serial:
  • Journal of the Structural Division
  • Volume: 105
  • Issue Number: 4
  • Publisher: American Society of Civil Engineers

Subject/Index Terms

• TRT Terms: Bridge decks; Digital computers; Dynamics; Finite element method; Highway bridges; Mathematical models; Suspension bridges; Torsion; Vibration; Warpage
• Uncontrolled Terms: Warping
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00195244
• Record Type: Publication
• Source Agency: Engineering Index
• Files: TRIS
• Created Date: Aug 28 1979 12:00AM