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김두기 ( Kim Doo Kie ),서형렬 ( Seo Hyeong-yeol ),김상훈 ( Kim Sang-hoon ),류회룡 ( Ryu Hee-ryong ) 한국구조물진단유지관리공학회 2004 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.8 No.2
This study presents fragility curves for the seismic risk analysis of a middle-span extradosed bridge with LRB seismic isolators. The nonlinear seismic analysis is performed using SAP2000, and SHAKE91 is used to consider the nonlinear characteristics of soil. The ductility demand is adopted to discribe the nonlinear behavior of a column, and the moment-curvature curve of a columns is assumed to have bilinear hysterestic characteristics. The fragility curve is represented as a function of peak ground acceleration(PGA) and a lognormal distribution function. Two parameters in the lognormal distribution are estimated by the maximum likelihood method. The results show that the effectiveness of the columns is more noticeable than those of cables and girders, in seismic isolated extradosed bridges, under earthquakes.