CALCULATION OF RESPONSE AND LOADING OF HIGHWAY BRIDGES FROM MODAL COORDINATES

FOR ANALYSIS OF RESPONSE UNDER VEHICLE LOADS A HIGHWAY BRIDGE IS OFTEN IDEALIZED AS A MASSLESS ELASTIC BEAM WITH AN APPROPRIATE DISTRIBUTION OF LIMPED MASSES. EQUATIONS OF MOTION FOR THE BRIDGE MAY THEN BE FORMULATED IN TERMS OF NATURAL MODAL (OR NORMAL) COORDINATES AND THE RESPONSE CALCULATED IN TERMS OF ONLY A SMALL NUMBER OF THESE. A METHOD IS PRESENTED HERE FOR CALCULATING BRIDGE DYNAMIC RESPONSE WHICH FOR SUCH A SET OF COORDINATES YIELDS GREATER ACCURACY THAN IS OBTAINED BY DIRECT COORDINATE- TRANSFORMATION. ALSO THE "FORCE SUMMATION" CONCEPT IS EMPLOYED FOR CALCULATION OF DYNAMIC BENDING MOMENTS AND SHEAR FORCES. A NUMERICAL EXAMPLE IS INCLUDED TO DEMONSTRATE THE IMPROVEMENT IN ACCURACY OBTAINED. /AUTHOR/

• Supplemental Notes:
  • PUBL 33-11
• Corporate Authors:

  International Association for Bridge and Structural Engineering

  ETH-Honggerberg, Wolfgang-Pauli-Strasse 15
  Zurich 8093,   Switzerland  CH-8093
• Authors:
  • Kishan, H
  • Traill-nash, R W
• Publication Date: 1973

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 113-30
• Serial:
  • Publication of: Probabilistic Aspects of Fatigue
  • Publisher: Probabilistic Aspects of Fatigue

Subject/Index Terms

• TRT Terms: Bending moments; Dynamic loads; Highway bridges; Live loads; Numerical analysis; Shear stress
• Uncontrolled Terms: Dynamic response; Shear forces
• Old TRIS Terms: Bridge dynamics
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00210074
• Record Type: Publication
• Files: TRIS
• Created Date: Jun 5 1974 12:00AM