VERTICAL MOTION OF HIGHWAY BRIDGE STRUCTURES DUE TO AN EARTHQUAKE

The dynamic response of continuous highway bridge superstructures due to pulsating support settlements induced by an earthquake is investigated. A governing differential equation for the dynamic behavior of bridge superstructures under pulsating support settlements has been formulated and a Fourier series type solution method is presented. The results have been successfully compared to those obtained by a dynamic three-moment equation. Four separate computer programs have been developed to facilitate the analysis and comparisons. The concept of dynamic amplification factors as the ratios of dynamic responses to static responses has been developed and subsequent charts have been plotted. Unusually high dynamic amplifications were observed, particularly in shearing forces. The reasons for such high values have been traced.

• Corporate Authors:

  Marquette University

  Department of Civil Engineering, 1515 West Wisconsin Avenue
  Milwaukee, WI  United States  53233

  National Science Foundation

  1800 G Street, NW
  Washington, DC  United States  20550
• Authors:
  • Yoo, C H
  • Acra, S V
  • Kao, J S
• Publication Date: 1981-1

Media Info

• Pagination: 142 p.

Subject/Index Terms

• TRT Terms: Bridge superstructures; Computer programs; Deflection; Differential equations; Dynamic loads; Dynamic structural analysis; Earthquakes; Highway bridges; Mathematical models; Shear stress
• Uncontrolled Terms: Dynamic response; Shear forces
• Old TRIS Terms: Shear stresses
• Subject Areas: Bridges and other structures; Design; Geotechnology; Highways; I24: Design of Bridges and Retaining Walls; I42: Soil Mechanics;

Filing Info

• Accession Number: 00344657
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: MUCE-81-1, NSF/CEE-81021
• Contract Numbers: NSF-PFR78-22845
• Files: TRIS
• Created Date: Dec 22 1982 12:00AM