Analysis of the Seismic Records of a Suspension Bridge

by A. M. Abdel-Ghaffar, Univ of Southern California, Los Angeles, United States,
Abdel-Salam M. Niazy, Univ of Southern California, Los Angeles, United States,
Sami F. Masri, Univ of Southern California, Los Angeles, United States,



Document Type: Proceeding Paper

Part of: Structural Engineering in Natural Hazards Mitigation

Abstract:

A well-instrumented suspension bridge in Los Angeles, was shaken by the October 1, 1987 Whittier earthquake (M_L = 5.9). This study addresses the following objectives: (1) three-dimensional modeling; (2) temporal and spectral analyses of the records; (3) modal identifications, including estimation of damping values; (4) a comparative study of analytical studies, the ambient vibration survey and the identified properties from the earthquake records; (5) envelopes of maximum earthquake-induced displacements and straining actions, and (6) recommendations for damping augmentation devices at critical zones. Finally, a reasonable agreement is found between the calculated and measured dynamic characteristics and response quantities.

Subject Headings: Suspension bridges | Earthquakes | Three-dimensional models | Three-dimensional analysis | Comparative studies | Seismic tests | Damping | Los Angeles | California | United States

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