Responses of Long-span Structures Subjected to Multiple Random Ground Excitations

Long span bridges are usually important public facilities and so much attention has been given to evaluating their safety during earthquakes. The wave-passage effect caused by the different times at which seismic waves arrive at different supports must be taken into account during their design. The random vibration approach is based on a statistical characterization of the set of motions at the supports. For a long time it has been widely regarded as a good alternative for dealing with the above spatially varying input motions, but finding suitable computational methods has proved to be a difficult problem. This problem is largely overcome by the recently developed Pseudo Excitation Method (PEM), which is a highly efficient and accurate algorithm series. It is accurate because the correlation terms between all participating modes and between all excitations have both been included. It is also easy to use because the stationary random vibration analysis is transformed into a harmonic vibration analysis. Such deterministic computations are very convenient and numerical comparisons given in this paper also show the good applicability of this PEM random vibration method in dealing with the spatial effects.

• Corporate Authors:

  Multidisciplinary Center for Earthquake Engineering Research

  State University of New York, 107 Red Jacket Quadrangle, P.O. Box 610025
  Buffalo, NY  United States  14261-0025
• Authors:
  • Tang, G W
  • Lin, J H
  • Zhao, Y
• Conference:
  • Third PRC-US Workshop on Seismic Analysis and Design of Special Bridges
  • Location: Shanghai , China
  • Date: 2004-10-21 to 2004-10-22
• Publication Date: 2005-4-20

Language

• English

Media Info

• Media Type: Print
• Edition: Technical Report
• Features: Figures; References; Tables;
• Pagination: pp 139-148
• Monograph Title: Proceedings of the Third PRC-US Workshop on Seismic Analysis and Design of Special Bridges

Subject/Index Terms

• TRT Terms: Algorithms; Bridge design; Earthquakes; Elastic waves; Excitation; Long span bridges; Safety
• Uncontrolled Terms: Computation; Pseudo excitation method; Wave passage effect
• Subject Areas: Bridges and other structures; Design; Highways; Safety and Human Factors; I24: Design of Bridges and Retaining Walls;

Filing Info

• Accession Number: 01018071
• Record Type: Publication
• Files: TRIS
• Created Date: Feb 1 2006 8:02AM