NEHRP Clearinghouse

Title
An Analysis of the Dynamic Characteristics of a Suspension Bridge by Ambient Vibration Measurements.
File
PB275063.pdf
Author(s)
Abdel-Ghaffar, A. M.; Housner, G. W.
Source
National Science Foundation, Washington, D.C., January 1977, 86 p.
Identifying Number(s)
EERL-77-01
Abstract
Extensive experimental investigations were conducted on the Vincent-Thomas Suspension Bridge at Los Angeles Harbor to determine natural frequencies and mode shapes of vertical, torsional and lateral vibrations of the structure. These ambient vibration tests involved the simultaneous measurements of both vertical and lateral vibrational motions caused by traffic. Measurements were made at selected points on different cross sections of the stiffening structure. Comparison with previously computed mode shapes and frequencies shows good agreement with the experimental results, thus confirming both the accuracy of the experimental determination and the reliability of the method of computation.
Keywords
Dynamic response; Vehicular traffic; Earthquake engineering; Earthquake resistant structures; Suspension bridges; Vibration; Vibration damping; Vincent-Thomas bridge; California; Vibration tests; Los Angeles harbor; Dynamic structural analysis