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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.

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2. Bridge Design

This paper reports on a non-linear analysis of a bridge supported on sliding bearings with elastomeric restoring spring and viscous dampers. Results were verified with shake table tests.

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10. INVESTIGATION OF LIGHT POLE BASE INTEGRITY – RICH STADIUM

Light poles at Rich Stadium in Orchard Park, N.Y., were showing incipient failure of their hold-down bolts, due to wind excitation. This paper describes the measures used to alleviate this problem, including the addition of viscous dampers between the stadium structure and a point around one third up on the light poles.

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