39. SEISMIC EVALUATION AND RETROFITTING OF U.S. LONG-SPAN SUSPENSION BRIDGES

This paper is a first attempt to raise issues about the seismic evaluation and retrofitting of longspan suspension bridges in the United States. The issues discussed in this paper deal seismic hazards and risks; performance and design criteria; ground motions; geotechnical engineering, substructure mathematical modeling, and soil structure interaction (SSI); actual conditions of structural components; superstructure mathematical modeling; ambient vibration testing; analysis of superstructure; suspension bridge component vulnerabilities; instrumentation and monitoring; laboratory testing; retrofitting; and the effects of limited funding and time constraints.