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Seismic Response of Multiple Span Steel Bridges in Central and Southeastern United States. I: As Built |
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| Authors: | Reginald DesRoches Eunsoo Choi Roberto T Leon Shirley J Dyke Mark Aschheim |
| Affiliation: | 1Assistant Professor, Georgia Institute of Technology, School of Civil and Environmental Engineering, Atlanta, GA 30332-0355. 2Graduate Research Assistant, Georgia Institute of Technology, School of Civil and Environmental Engineering, Atlanta, GA 30332-0355. 3Professor, Georgia Institute of Technology, School of Civil and Environmental Engineering, Atlanta, GA 30332-0355. 4Associate Professor, Dept. of Civil Engineering, Washington Univ., Campus Box 1130, 1 Brookings Dr. St. Louis, MO 63130. 5Assistant Professor, Dept. of Civil and Environmental Engineering, Univ. of Illinois, 2118 Newmark Civil Engineering Laboratory, 205 North Matthews Ave., Urbana, IL 61801. |
| Abstract: | The seismic response of typical multispan simply supported (MSSS) and multispan continuous steel girder bridges in the central and southeastern United States is evaluated. Nonlinear time history analyses are conducted using synthetic ground motion for three cities for 475 and 2,475-year return period earthquakes (10 and 2% probability of exceedance in 50 years). The results indicate that the seismic response for the 475-year return period earthquake would lead to an essentially linear response in typical bridges. However, the seismic response for a 2,475-year return period earthquake resulted in significant demands on nonductile columns, fixed and expansion bearings, and abutments. In particular, pounding between decks in the MSSS bridge would result in significant damage to steel bearings and would lead to the toppling of rocker bearings, which may result in unseating of the bridge deck. |
| Keywords: | Earthquakes Bridges steel Bridges girder Bridge construction Bearing capacity Seismic response United States |